Erweiterungen

package.json

@@ -0,0 +1,110 @@
+{
+  "name": "no-name",
+  "license": "UNLICENSED",
+  "type": "module",
+  "dependencies": {
+    "@polymer/polymer": "3.5.2",
+    "@vaadin/bundles": "24.7.7",
+    "@vaadin/common-frontend": "0.0.19",
+    "@vaadin/polymer-legacy-adapter": "24.7.7",
+    "@vaadin/react-components": "24.7.7",
+    "@vaadin/react-components-pro": "24.7.7",
+    "@vaadin/vaadin-development-mode-detector": "2.0.7",
+    "@vaadin/vaadin-lumo-styles": "24.7.7",
+    "@vaadin/vaadin-material-styles": "24.7.7",
+    "@vaadin/vaadin-themable-mixin": "24.7.7",
+    "@vaadin/vaadin-usage-statistics": "2.1.3",
+    "construct-style-sheets-polyfill": "3.1.0",
+    "date-fns": "2.29.3",
+    "lit": "3.3.0",
+    "proj4": "2.15.0",
+    "react": "18.3.1",
+    "react-dom": "18.3.1",
+    "react-router": "7.5.2"
+  },
+  "devDependencies": {
+    "@babel/preset-react": "7.26.3",
+    "@preact/signals-react-transform": "0.5.1",
+    "@rollup/plugin-replace": "6.0.2",
+    "@rollup/pluginutils": "5.1.4",
+    "@types/react": "18.3.20",
+    "@types/react-dom": "18.3.6",
+    "@vitejs/plugin-react": "4.4.1",
+    "async": "3.2.6",
+    "glob": "11.0.2",
+    "rollup-plugin-brotli": "3.1.0",
+    "rollup-plugin-visualizer": "5.14.0",
+    "strip-css-comments": "5.0.0",
+    "transform-ast": "2.4.4",
+    "typescript": "5.7.3",
+    "vite": "6.3.4",
+    "vite-plugin-checker": "0.9.1",
+    "workbox-build": "7.3.0",
+    "workbox-core": "7.3.0",
+    "workbox-precaching": "7.3.0"
+  },
+  "vaadin": {
+    "dependencies": {
+      "@polymer/polymer": "3.5.2",
+      "@vaadin/bundles": "24.7.7",
+      "@vaadin/common-frontend": "0.0.19",
+      "@vaadin/polymer-legacy-adapter": "24.7.7",
+      "@vaadin/react-components": "24.7.7",
+      "@vaadin/react-components-pro": "24.7.7",
+      "@vaadin/vaadin-development-mode-detector": "2.0.7",
+      "@vaadin/vaadin-lumo-styles": "24.7.7",
+      "@vaadin/vaadin-material-styles": "24.7.7",
+      "@vaadin/vaadin-themable-mixin": "24.7.7",
+      "@vaadin/vaadin-usage-statistics": "2.1.3",
+      "construct-style-sheets-polyfill": "3.1.0",
+      "date-fns": "2.29.3",
+      "lit": "3.3.0",
+      "proj4": "2.15.0",
+      "react": "18.3.1",
+      "react-dom": "18.3.1",
+      "react-router": "7.5.2"
+    },
+    "devDependencies": {
+      "@babel/preset-react": "7.26.3",
+      "@preact/signals-react-transform": "0.5.1",
+      "@rollup/plugin-replace": "6.0.2",
+      "@rollup/pluginutils": "5.1.4",
+      "@types/react": "18.3.20",
+      "@types/react-dom": "18.3.6",
+      "@vitejs/plugin-react": "4.4.1",
+      "async": "3.2.6",
+      "glob": "11.0.2",
+      "rollup-plugin-brotli": "3.1.0",
+      "rollup-plugin-visualizer": "5.14.0",
+      "strip-css-comments": "5.0.0",
+      "transform-ast": "2.4.4",
+      "typescript": "5.7.3",
+      "vite": "6.3.4",
+      "vite-plugin-checker": "0.9.1",
+      "workbox-build": "7.3.0",
+      "workbox-core": "7.3.0",
+      "workbox-precaching": "7.3.0"
+    },
+    "hash": "c18408e57a0875a842d7f93da064e1b59d0f12787cf31c11320e67bdbc80cdb5"
+  },
+  "overrides": {
+    "@vaadin/bundles": "$@vaadin/bundles",
+    "@vaadin/polymer-legacy-adapter": "$@vaadin/polymer-legacy-adapter",
+    "@vaadin/vaadin-development-mode-detector": "$@vaadin/vaadin-development-mode-detector",
+    "@vaadin/vaadin-usage-statistics": "$@vaadin/vaadin-usage-statistics",
+    "@vaadin/react-components": "$@vaadin/react-components",
+    "@vaadin/react-components-pro": "$@vaadin/react-components-pro",
+    "@vaadin/common-frontend": "$@vaadin/common-frontend",
+    "react-dom": "$react-dom",
+    "construct-style-sheets-polyfill": "$construct-style-sheets-polyfill",
+    "lit": "$lit",
+    "@polymer/polymer": "$@polymer/polymer",
+    "react": "$react",
+    "react-router": "$react-router",
+    "date-fns": "$date-fns",
+    "proj4": "$proj4",
+    "@vaadin/vaadin-themable-mixin": "$@vaadin/vaadin-themable-mixin",
+    "@vaadin/vaadin-lumo-styles": "$@vaadin/vaadin-lumo-styles",
+    "@vaadin/vaadin-material-styles": "$@vaadin/vaadin-material-styles"
+  }
+}

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>de.assecutor.emulatorstation</groupId>
     <artifactId>emulatorstation</artifactId>
-    <version>0.9.7</version>
+    <version>0.9.13</version>
 
     <packaging>jar</packaging>
 

src/main/java/de/assecutor/emulatorstation/Application.java

@@ -10,17 +10,18 @@ import java.util.concurrent.ConcurrentHashMap;
 import de.assecutor.emulatorstation.pojo.UserInfo;
 import de.assecutor.emulatorstation.pojo.NiederlassungInfo;
 
+import org.springframework.scheduling.annotation.EnableScheduling;
+
 @SpringBootApplication
 @Push
+@EnableScheduling
+
 @Theme("default")
 public class Application implements AppShellConfigurator {
-    public static final Map<String, UserInfo> users = Map.ofEntries(
+    // Single user configuration
-            Map.entry("user1", new UserInfo("pass1")),
+    public static final String SINGLE_USERNAME = "user";
-            Map.entry("user2", new UserInfo("pass2")),
+    public static final String SINGLE_PASSWORD = "user123";
-            Map.entry("user3", new UserInfo("pass3")),
+    public static final int MAX_ACTIVE_SESSIONS = 5;
-            Map.entry("user4", new UserInfo("pass4")),
-            Map.entry("user5", new UserInfo("pass5"))
-    );
 
     public static final Map<String, NiederlassungInfo> niederlassungen = Map.ofEntries(
             Map.entry("Berlin", new NiederlassungInfo("Berlin", "172.18.0.103", "6083", "/berlin")),
@@ -32,12 +33,11 @@ public class Application implements AppShellConfigurator {
             Map.entry("Hannover", new NiederlassungInfo("Hannover", "172.18.0.104", "6084", "/hannover")),
             Map.entry("Stuttgart", new NiederlassungInfo("Stuttgart", "172.18.0.111", "6091", "/stuttgart")),
             Map.entry("Frankfurt am Main", new NiederlassungInfo("Frankfurt am Main", "172.18.0.105", "6085", "/frankfurt")),
-            Map.entry("Geschäftführung", new NiederlassungInfo("Geschäftführung", "172.18.0.112", "6092", "/gfl")),
+            Map.entry("Geschäftführung", new NiederlassungInfo("Geschäftführung", "172.18.0.112", "6092", "/gfl")));
-            Map.entry("Admin", new NiederlassungInfo("Admin", "172.18.0.110", "6090", "/admin"))
-    );
 
+    public static final java.util.Map<String, com.vaadin.flow.server.WrappedSession> sessionsById = new ConcurrentHashMap<>();
     public static final Map<String, String> activeNiederlassungen = new ConcurrentHashMap<>();
-    public static final Map<String, String> activeUsers = new ConcurrentHashMap<>();
+    public static final Map<String, String> activeSessions = new ConcurrentHashMap<>(); // sessionId -> niederlassung
 
     public static void main(String[] args) {
         SpringApplication.run(Application.class, args);

src/main/java/de/assecutor/emulatorstation/base/domain/ContainerShutdownScheduler.java

@@ -0,0 +1,99 @@
+package de.assecutor.emulatorstation.base.domain;
+
+import de.assecutor.emulatorstation.Application;
+import de.assecutor.emulatorstation.pojo.NiederlassungInfo;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.stereotype.Service;
+
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+
+@Service
+public class ContainerShutdownScheduler {
+
+    private static final Logger logger = LoggerFactory.getLogger(ContainerShutdownScheduler.class);
+
+    private static final String DOCKER_HOST = "172.16.0.158"; // gleiches Fallback wie in MainView/LoginView
+
+    private final HttpClient http = HttpClient.newHttpClient();
+
+    // Täglich um 22:00 Uhr Serverzeit
+    @Scheduled(cron = "0 0 22 * * *")
+    public void shutdownAllRunningContainers() {
+        logger.info("[Scheduler] Starte nächtliches Herunterfahren aller laufenden Emulator-Container (22:00)");
+        for (NiederlassungInfo info : Application.niederlassungen.values()) {
+            String containerName = buildContainerName(info);
+            try {
+                if (isRunning(containerName)) {
+                    stopContainer(containerName);
+                } else {
+                    logger.info("[Scheduler] Container '{}' läuft nicht – nichts zu tun", containerName);
+                }
+            } catch (Exception e) {
+                logger.warn("[Scheduler] Fehler beim Beenden des Containers '{}': {}", containerName, e.toString());
+            }
+        }
+        logger.info("[Scheduler] Nächtliches Herunterfahren abgeschlossen");
+
+        // Alle Sessions beenden (Logout erzwingen)
+        logger.info("[Scheduler] Beginne Session-Logout für alle aktiven Sessions: {}", Application.sessionsById.size());
+        for (com.vaadin.flow.server.WrappedSession session : new java.util.ArrayList<>(Application.sessionsById.values())) {
+            try {
+                session.invalidate();
+            } catch (Exception e) {
+                logger.warn("[Scheduler] Fehler beim Invalidieren einer Session: {}", e.toString());
+            }
+        }
+        // Zur Sicherheit interne Mappings leeren
+        Application.activeSessions.clear();
+        Application.activeNiederlassungen.clear();
+        Application.sessionsById.clear();
+        logger.info("[Scheduler] Session-Logout abgeschlossen. Aktive Sessions: {} / Maps geleert.", Application.activeSessions.size());
+
+    }
+
+    private String buildContainerName(NiederlassungInfo info) {
+        return "android-container-" + info.name();
+    }
+
+    private boolean isRunning(String containerName) throws Exception {
+        HttpRequest req = HttpRequest.newBuilder()
+                .uri(URI.create("http://" + DOCKER_HOST + ":2375/containers/" + containerName + "/json"))
+                .GET()
+                .build();
+        HttpResponse<String> resp = http.send(req, HttpResponse.BodyHandlers.ofString());
+        if (resp.statusCode() == 200) {
+            String body = resp.body();
+            boolean running = body != null && body.contains("\"Running\":true");
+            logger.info("[Scheduler] Inspect '{}' -> running={}", containerName, running);
+            return running;
+        } else if (resp.statusCode() == 404) {
+            logger.info("[Scheduler] Container '{}' existiert nicht (404)", containerName);
+            return false;
+        } else {
+            logger.info("[Scheduler] Inspect '{}' -> status {}", containerName, resp.statusCode());
+            return false;
+        }
+    }
+
+    private void stopContainer(String containerName) throws Exception {
+        HttpRequest req = HttpRequest.newBuilder()
+                .uri(URI.create("http://" + DOCKER_HOST + ":2375/containers/" + containerName + "/stop"))
+                .POST(HttpRequest.BodyPublishers.noBody())
+                .build();
+        HttpResponse<String> resp = http.send(req, HttpResponse.BodyHandlers.ofString());
+        int status = resp.statusCode();
+        if (status == 204 || status == 304) {
+            logger.info("[Scheduler] Container '{}' gestoppt (status={})", containerName, status);
+        } else if (status == 404) {
+            logger.info("[Scheduler] Container '{}' nicht gefunden (404)", containerName);
+        } else {
+            logger.warn("[Scheduler] Unerwarteter Status beim Stoppen von '{}' -> {} / {}", containerName, status, resp.body());
+        }
+    }
+}
+

src/main/java/de/assecutor/emulatorstation/base/ui/view/LoginView.java

@@ -1,13 +1,16 @@
 package de.assecutor.emulatorstation.base.ui.view;
 
-import com.vaadin.flow.component.html.Span;
+import com.vaadin.flow.component.html.Div;
-import com.vaadin.flow.component.login.LoginForm;
+import com.vaadin.flow.component.html.H1;
+import com.vaadin.flow.component.html.Paragraph;
 import com.vaadin.flow.component.orderedlayout.VerticalLayout;
 import com.vaadin.flow.component.select.Select;
 import com.vaadin.flow.component.button.Button;
-import com.vaadin.flow.component.textfield.TextField;
+import com.vaadin.flow.component.button.ButtonVariant;
 import com.vaadin.flow.component.textfield.PasswordField;
 import com.vaadin.flow.component.notification.Notification;
+import com.vaadin.flow.component.icon.Icon;
+import com.vaadin.flow.component.icon.VaadinIcon;
 import com.vaadin.flow.router.Route;
 import com.vaadin.flow.server.auth.AnonymousAllowed;
 import de.assecutor.emulatorstation.Application;
@@ -17,6 +20,8 @@ import org.springframework.security.core.context.SecurityContextHolder;
 import java.util.List;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.springframework.security.web.context.HttpSessionSecurityContextRepository;
+
 
 @Route("login")
 @AnonymousAllowed
@@ -25,52 +30,75 @@ public class LoginView extends VerticalLayout {
     private static final Logger logger = LoggerFactory.getLogger(LoginView.class);
 
     public LoginView() {
+        setSizeFull();
         setAlignItems(Alignment.CENTER);
+        setJustifyContentMode(JustifyContentMode.CENTER);
+        getStyle().set("background", "linear-gradient(135deg, #667eea 0%, #764ba2 100%)").set("min-height", "100vh")
+                .set("padding", "20px");
 
-        Span title = new Span("Anmelden");
+        // Haupt-Container für das Login-Formular
-        title.getStyle().set("font-size", "24px").set("font-weight", "bold");
+        Div loginContainer = new Div();
+        loginContainer.getStyle().set("background-color", "#ffffff").set("border-radius", "12px")
+                .set("box-shadow", "0 10px 30px rgba(0,0,0,0.2)").set("padding", "40px").set("max-width", "400px")
+                .set("width", "100%").set("text-align", "center");
 
-        TextField usernameField = new TextField("Benutzername");
+        // Logo/Icon
+        Icon icon = new Icon(VaadinIcon.DESKTOP);
+        icon.setSize("64px");
+        icon.getStyle().set("color", "#667eea").set("margin-bottom", "20px");
+
+        // Titel
+        H1 title = new H1("Emulator Station");
+        title.getStyle().set("margin", "0 0 8px 0").set("color", "#333333").set("font-size", "2rem").set("font-weight",
+                "600");
+
+        // Untertitel
+        Paragraph subtitle = new Paragraph("Melden Sie sich an, um fortzufahren");
+        subtitle.getStyle().set("margin", "0 0 30px 0").set("color", "#666666").set("font-size", "0.95rem");
+
+        // Form-Container
+        VerticalLayout formLayout = new VerticalLayout();
+        formLayout.setSpacing(true);
+        formLayout.setPadding(false);
+        formLayout.setWidthFull();
+
+        // Eingabefelder - nur noch Passwort
         PasswordField passwordField = new PasswordField("Passwort");
+        passwordField.setWidthFull();
+        passwordField.getStyle().set("margin-bottom", "16px");
 
         Select<String> niederlassungSelect = new Select<>();
         niederlassungSelect.setLabel("Niederlassung");
         niederlassungSelect.setItems(Application.niederlassungen.keySet().stream().sorted().toList());
         niederlassungSelect.setPlaceholder("Wählen Sie eine Niederlassung");
+        niederlassungSelect.setWidthFull();
+        niederlassungSelect.getStyle().set("margin-bottom", "24px");
 
-        Button loginButton = new Button("Anmelden", event -> {
+        Button loginButton = new Button("Anmelden", new Icon(VaadinIcon.SIGN_IN), event -> {
-            String username = usernameField.getValue();
             String password = passwordField.getValue();
             String niederlassung = niederlassungSelect.getValue();
 
-            if (username.isEmpty() || password.isEmpty() || niederlassung == null) {
+            // Validierung der Eingabefelder
+            if (password.isEmpty() || niederlassung == null) {
                 Notification.show("Bitte alle Felder ausfüllen", 3000, Notification.Position.MIDDLE);
                 return;
             }
 
-            if (!Application.users.containsKey(username) ||
+            // Passwort prüfen
-                !Application.users.get(username).password().equals(password)) {
+            if (!Application.SINGLE_PASSWORD.equals(password)) {
-                Notification.show("Ungültige Anmeldedaten", 3000, Notification.Position.MIDDLE);
+                Notification.show("Ungültiges Passwort", 3000, Notification.Position.MIDDLE);
                 return;
             }
 
-            if (Application.activeUsers.containsKey(username)) {
+            // Maximale Session-Anzahl prüfen
-                Notification.show("Benutzer ist bereits angemeldet", 3000, Notification.Position.MIDDLE);
+            if (Application.activeSessions.size() >= Application.MAX_ACTIVE_SESSIONS) {
+                Notification.show(
+                        "Maximale Anzahl von " + Application.MAX_ACTIVE_SESSIONS
+                                + " gleichzeitigen Anmeldungen erreicht. Bitte versuchen Sie es später erneut.",
+                        5000, Notification.Position.MIDDLE);
                 return;
             }
 
-            if (Application.activeNiederlassungen.containsKey(niederlassung)) {
-                Notification.show("Niederlassung ist bereits von einem anderen Benutzer belegt", 3000, Notification.Position.MIDDLE);
-                return;
-            }
-
-            Application.activeNiederlassungen.put(niederlassung, username);
-            Application.activeUsers.put(username, niederlassung);
-
-            // Spring Security Authentifizierung setzen
-            var authorities = List.of(new SimpleGrantedAuthority("ROLE_USER"));
-            var authentication = new UsernamePasswordAuthenticationToken(username, password, authorities);
-            SecurityContextHolder.getContext().setAuthentication(authentication);
 
             var niederlassungInfo = Application.niederlassungen.get(niederlassung);
             if (niederlassungInfo == null) {
@@ -79,22 +107,120 @@ public class LoginView extends VerticalLayout {
             }
 
             getUI().ifPresent(ui -> {
-                ui.getSession().setAttribute("user", username);
+                if (isContainerRunning(niederlassungInfo)) {
-                ui.getSession().setAttribute("username", username);
+                    var dialog = new com.vaadin.flow.component.dialog.Dialog();
-                ui.getSession().setAttribute("niederlassung", niederlassungInfo);
+                    dialog.setHeaderTitle("Container läuft bereits");
-
+                    var text = new Paragraph("Für '" + niederlassungInfo.name() + "' läuft bereits ein Emulator-Container. Möchten Sie ihn für diese Session übernehmen?");
-                logger.info("Login erfolgreich - Session-Daten gesetzt:");
+                    var adopt = new Button("Übernehmen", e2 -> {
-                logger.info("Username: {}", username);
+                        dialog.close();
-                logger.info("Niederlassung: {}", niederlassungInfo.name());
+                        completeLogin(ui, password, niederlassungInfo, true);
-
+                    });
-                ui.navigate("main");
+                    adopt.addThemeVariants(ButtonVariant.LUMO_PRIMARY);
+                    var cancel = new Button("Abbrechen", e2 -> dialog.close());
+                    var buttons = new com.vaadin.flow.component.orderedlayout.HorizontalLayout(cancel, adopt);
+                    buttons.setWidthFull();
+                    buttons.setJustifyContentMode(com.vaadin.flow.component.orderedlayout.FlexComponent.JustifyContentMode.END);
+                    dialog.add(text, buttons);
+                    dialog.open();
+                } else {
+                    completeLogin(ui, password, niederlassungInfo, false);
+                }
             });
         });
 
-        add(title, usernameField, passwordField, niederlassungSelect, loginButton);
+        // Button-Styling
+        loginButton.addThemeVariants(ButtonVariant.LUMO_PRIMARY, ButtonVariant.LUMO_LARGE);
+        loginButton.setWidthFull();
+        loginButton.getStyle().set("margin-top", "8px")
+                .set("background", "linear-gradient(135deg, #667eea 0%, #764ba2 100%)").set("border", "none")
+                .set("font-weight", "600");
+
+        // Eingabefelder zum Form-Layout hinzufügen
+        formLayout.add(passwordField, niederlassungSelect, loginButton);
+
+        // Alle Komponenten zum Login-Container hinzufügen
+        loginContainer.add(icon, title, subtitle, formLayout);
+
+        // Login-Container zur Hauptansicht hinzufügen
+        add(loginContainer);
 
         if (MainLayout.instance != null) {
             MainLayout.instance.setDrawerOpened(false);
         }
     }
+
+    private boolean isContainerRunning(de.assecutor.emulatorstation.pojo.NiederlassungInfo info) {
+        if (info == null) {
+            return false;
+        }
+        final String srv = "172.16.0.158"; // Fallback wie in MainView
+        final String name = "android-container-" + info.name();
+        try {
+            var client = java.net.http.HttpClient.newHttpClient();
+            var request = java.net.http.HttpRequest.newBuilder()
+                    .uri(java.net.URI.create("http://" + srv + ":2375/containers/" + name + "/json"))
+                    .GET()
+                    .build();
+            var response = client.send(request, java.net.http.HttpResponse.BodyHandlers.ofString());
+            if (response.statusCode() == 200) {
+                var body = response.body();
+                return body != null && body.contains("\"Running\":true");
+            }
+        } catch (Exception e) {
+            logger.warn("Fehler beim Pruefen des Container-Status fuer '{}': {}", name, e.toString());
+        }
+        return false;
+    }
+
+    private void completeLogin(com.vaadin.flow.component.UI ui, String password,
+                               de.assecutor.emulatorstation.pojo.NiederlassungInfo niederlassungInfo,
+                               boolean adoptRunningContainer) {
+        String niederlassung = niederlassungInfo.name();
+
+        String sessionId = ui.getSession().getSession().getId();
+        // Session niemals ablaufen lassen
+        ui.getSession().getSession().setMaxInactiveInterval(-1);
+
+        // HttpSession/WrappedSession im Registry merken, um später invalidieren zu können
+        Application.sessionsById.put(sessionId, ui.getSession().getSession());
+
+
+        // Session registrieren
+        Application.activeSessions.put(sessionId, niederlassung);
+        Application.activeNiederlassungen.put(niederlassung, sessionId);
+
+        // Log that Niederlassung is now blocked
+        logger.info("Niederlassung '{}' wurde gesperrt fuer Session {}", niederlassung, sessionId);
+        logger.info("Aktive Niederlassungen: {}", Application.activeNiederlassungen.keySet());
+
+        // Spring Security Authentifizierung setzen
+        var authorities = java.util.List.of(new org.springframework.security.core.authority.SimpleGrantedAuthority("ROLE_USER"));
+        var authentication = new org.springframework.security.authentication.UsernamePasswordAuthenticationToken(
+                Application.SINGLE_USERNAME, password, authorities);
+        org.springframework.security.core.context.SecurityContextHolder.getContext().setAuthentication(authentication);
+
+        // Spring Security Kontext explizit in der HTTP-Session speichern, damit Reload eingeloggt bleibt
+        ui.getSession().getSession().setAttribute(
+                org.springframework.security.web.context.HttpSessionSecurityContextRepository.SPRING_SECURITY_CONTEXT_KEY,
+                org.springframework.security.core.context.SecurityContextHolder.getContext());
+
+        // Session-Daten setzen
+        ui.getSession().setAttribute("user", Application.SINGLE_USERNAME);
+        ui.getSession().setAttribute("username", Application.SINGLE_USERNAME);
+        ui.getSession().setAttribute("niederlassung", niederlassungInfo);
+        ui.getSession().setAttribute("sessionId", sessionId);
+        if (adoptRunningContainer) {
+            // UI soll direkt in gestarteten Zustand gehen
+            ui.getSession().setAttribute("emulatorStarted", true);
+        }
+
+        logger.info("Login erfolgreich - Session-Daten gesetzt:");
+        logger.info("Username: {}", Application.SINGLE_USERNAME);
+        logger.info("Niederlassung: {}", niederlassungInfo.name());
+        logger.info("SessionId: {}", sessionId);
+        logger.info("Aktive Sessions: {}/{}", Application.activeSessions.size(), Application.MAX_ACTIVE_SESSIONS);
+
+        ui.navigate("main");
+    }
+
 }

src/main/java/de/assecutor/emulatorstation/base/ui/view/MainLayout.java

@@ -42,24 +42,17 @@ public final class MainLayout extends AppLayout {
         UI ui = UI.getCurrent();
         ui.setPollInterval(60000); // Poll-Intervall auf 60 Sekunden setzen
 
-        // Session expiration handling
+        // Session keep-alive - no automatic invalidation on reload
         ui.addPollListener(event -> {
-            if (!isUserSessionValid()) {
+            // Just keep the session alive, don't invalidate
-                VaadinSession.getCurrent().getSession().invalidate(); // Session invalidieren
+            // Session timeout is now handled by Spring Security configuration
-                ui.access(() -> ui.navigate("main")); // Immer zur Main-Seite weiterleiten
+            if (VaadinSession.getCurrent() != null) {
+                // Touch the session to keep it alive
+                VaadinSession.getCurrent().getSession().getMaxInactiveInterval();
             }
         });
     }
 
-    private boolean isUserSessionValid() {
-        // Logik für Sitzungsprüfung, z.B. Timeout-Zeit überprüfen
-        return VaadinSession.getCurrent() != null
-                && VaadinSession.getCurrent().getSession() != null
-                && VaadinSession.getCurrent().getSession().getLastAccessedTime() + 300000
-                > System.currentTimeMillis(); // 300000 ms = 5 Minuten
-    }
-
-
     private Div createHeader() {
         // TODO Replace with real application logo and name
         var appLogo = VaadinIcon.CUBES.create();

src/main/java/de/assecutor/emulatorstation/base/ui/view/MainView.java

@@ -6,8 +6,10 @@ import com.vaadin.flow.component.button.ButtonVariant;
 import com.vaadin.flow.component.dialog.Dialog;
 import com.vaadin.flow.component.html.Div;
 import com.vaadin.flow.component.html.H2;
+import com.vaadin.flow.component.html.H3;
 import com.vaadin.flow.component.html.IFrame;
 import com.vaadin.flow.component.html.Paragraph;
+import com.vaadin.flow.component.progressbar.ProgressBar;
 import com.vaadin.flow.component.icon.Icon;
 import com.vaadin.flow.component.icon.VaadinIcon;
 import com.vaadin.flow.component.orderedlayout.HorizontalLayout;
@@ -18,7 +20,10 @@ import com.vaadin.flow.router.BeforeEnterObserver;
 import com.vaadin.flow.component.UI;
 import com.vaadin.flow.component.html.Main;
 import com.vaadin.flow.router.Route;
+import com.vaadin.flow.router.PreserveOnRefresh;
+
 import com.vaadin.flow.server.auth.AnonymousAllowed;
+import com.vaadin.flow.server.VaadinSession;
 import de.assecutor.emulatorstation.pojo.ExecResponse;
 import de.assecutor.emulatorstation.pojo.NiederlassungInfo;
 import de.assecutor.emulatorstation.Application;
@@ -35,9 +40,9 @@ import java.util.concurrent.Executors;
 
 @PermitAll // When security is enabled, allow all authenticated users
 @Route("main")
+@PreserveOnRefresh
 @AnonymousAllowed
-public final class MainView extends Main implements BeforeEnterObserver
+public final class MainView extends Main implements BeforeEnterObserver {
-{
     private static final Logger logger = LoggerFactory.getLogger(MainView.class);
     private String username;
     private NiederlassungInfo niederlassung;
@@ -52,69 +57,104 @@ public final class MainView extends Main implements BeforeEnterObserver
 
     MainView() {
         setSizeFull();
-        getStyle()
+        getStyle().set("background", "linear-gradient(135deg, #667eea 0%, #764ba2 100%)").set("min-height", "100vh")
-            .set("display", "flex")
+                .set("display", "flex").set("flex-direction", "column").set("align-items", "center")
-            .set("flex-direction", "column")
+                .set("justify-content", "center").set("padding", "2.5%").set("box-sizing", "border-box")
-            .set("align-items", "center")
-            .set("justify-content", "center")
-            .set("padding", "5%")
-            .set("box-sizing", "border-box")
                 .set("overflow", "hidden");
 
         var contentContainer = new Div();
-        contentContainer.getStyle()
+        contentContainer.getStyle().set("width", "95%").set("height", "95%").set("display", "flex")
-            .set("width", "95%")
+                .set("flex-direction", "column").set("box-sizing", "border-box");
-            .set("height", "95%")
+
-            .set("display", "flex")
-            .set("flex-direction", "column")
-            .set("box-sizing", "border-box");
 
-        setupInactivityTimer();
         setupWelcomeMessage(contentContainer);
         setupEmulatorContainer(contentContainer);
         setupButtonLayout(contentContainer);
 
         add(contentContainer);
-        addAttachListener(event -> loadSessionData());
+        addAttachListener(event -> {
+            loadSessionData();
+            setupSessionCleanupListener();
+            restoreUIStateIfNeeded();
+        });
+
+        // Kein Cleanup mehr beim Detach, um Reload-Resume zu ermöglichen
     }
 
-    private void setupInactivityTimer() {
+    private void setupSessionCleanupListener() {
-        String jsCode = """
+        VaadinSession session = VaadinSession.getCurrent();
-                var inactivityTime = function () {
+        if (session != null) {
-                    var time;
+            Boolean registered = (Boolean) session.getAttribute("cleanupListenerRegistered");
-                    window.onload = resetTimer;
+            if (Boolean.TRUE.equals(registered)) {
-                    document.onmousemove = resetTimer;
+                return;
-                    document.onkeypress = resetTimer;
+            }
-                    document.onclick = resetTimer;
+            session.addSessionDestroyListener(event -> {
-                    document.onscroll = resetTimer;
+                logger.info("Session destroy event triggered - cleaning up resources");
-
+                // Cleanup will be done in a background thread to avoid blocking
-                    function logout() {
+                executor.submit(() -> {
-                        $0.$server.logout();
+                    try {
+                        cleanupResources();
+                    } catch (Exception ex) {
+                        logger.error("Error during session cleanup", ex);
+                    }
+                });
+            });
+            session.setAttribute("cleanupListenerRegistered", true);
+            logger.info("Session cleanup listener registered for session: {}", session.getSession().getId());
+        }
     }
 
-                    function resetTimer() {
+    private void cleanupResources() {
-                        clearTimeout(time);
+        try {
-                        time = setTimeout(logout, 4 * 60 * 60 * 1000);
+            logger.info("Starting resource cleanup");
-                    }
-                };
-                inactivityTime();
-                """;
 
-        UI.getCurrent().getPage().executeJs(jsCode, this);
+            // Get session information before cleanup
+            String sessionId = null;
+            String niederlassungName = null;
+
+            if (getUI().isPresent()) {
+                VaadinSession session = getUI().get().getSession();
+                if (session != null) {
+                    sessionId = (String) session.getAttribute("sessionId");
+                    if (niederlassung != null) {
+                        niederlassungName = niederlassung.name();
                     }
+                }
+            }
+
+            // Shutdown containers
+            logger.info("Shutting down containers for niederlassung: {}", niederlassungName);
+            shutdown();
+
+            // Remove from active sessions and niederlassungen
+            if (sessionId != null) {
+                Application.activeSessions.remove(sessionId);
+                logger.info("Session {} removed from active sessions", sessionId);
+            }
+
+            if (niederlassungName != null) {
+                Application.activeNiederlassungen.remove(niederlassungName);
+                logger.info("Niederlassung '{}' wurde freigegeben und ist wieder verfügbar für neue Anmeldungen",
+                        niederlassungName);
+                logger.info("Aktive Niederlassungen nach Freigabe: {}", Application.activeNiederlassungen.keySet());
+            }
+
+            logger.info("Resource cleanup completed successfully");
+            logger.info("Active sessions after cleanup: {}/{}", Application.activeSessions.size(),
+                    Application.MAX_ACTIVE_SESSIONS);
+
+        } catch (Exception ex) {
+            logger.error("Error during resource cleanup", ex);
+        }
+    }
+
+
 
     private void setupWelcomeMessage(Div container) {
         welcomeMessage.addClassName("welcome-panel");
-        welcomeMessage.getStyle()
+        welcomeMessage.getStyle().set("display", "flex").set("flex-direction", "column").set("align-items", "center")
-            .set("display", "flex")
+                .set("justify-content", "center").set("flex-grow", "1").set("background-color", "#f8f9fa")
-            .set("flex-direction", "column")
+                .set("border", "2px dashed #dee2e6").set("border-radius", "8px").set("color", "#6c757d")
-            .set("align-items", "center")
-            .set("justify-content", "center")
-            .set("flex-grow", "1")
-            .set("background-color", "#f8f9fa")
-            .set("border", "2px dashed #dee2e6")
-            .set("border-radius", "8px")
-            .set("color", "#6c757d")
                 .set("margin-bottom", "16px");
 
         Icon icon = new Icon(VaadinIcon.DESKTOP);
@@ -124,7 +164,8 @@ public final class MainView extends Main implements BeforeEnterObserver
         H2 title = new H2("Willkommen bei der Emulator Station");
         title.getStyle().set("margin", "0 0 6px 0").set("color", "#495057").set("font-size", "1.5rem");
 
-        Paragraph description = new Paragraph("Klicken Sie auf 'Start', um Ihren Android Emulator zu starten.");
+        Paragraph description = new Paragraph(
+                "Klicken Sie auf 'Emulator starten', um Ihren Android Emulator zu starten.");
         description.getStyle().set("margin", "0").set("text-align", "center").set("font-size", "0.9rem");
 
         welcomeMessage.add(icon, title, description);
@@ -134,32 +175,24 @@ public final class MainView extends Main implements BeforeEnterObserver
     private void setupButtonLayout(Div container) {
         var buttonLayout = new HorizontalLayout();
         buttonLayout.setJustifyContentMode(HorizontalLayout.JustifyContentMode.CENTER);
-        buttonLayout.getStyle()
+        buttonLayout.getStyle().set("margin", "0").set("padding", "8px 0").set("flex-shrink", "0").set("order", "999");
-            .set("margin", "0")
-            .set("padding", "8px 0")
-            .set("flex-shrink", "0")
-            .set("order", "999");
 
         startBtn = new Button("Emulator starten", new Icon(VaadinIcon.PLAY), event -> startup());
         startBtn.addThemeVariants(ButtonVariant.LUMO_PRIMARY);
 
         Button logoutBtn = new Button("Abmelden", new Icon(VaadinIcon.SIGN_OUT), event -> logout());
         logoutBtn.addThemeVariants(ButtonVariant.LUMO_CONTRAST);
+        logoutBtn.getStyle().set("background-color", "#f5f5f5").set("color", "#333333").set("border",
+                "1px solid #d0d0d0");
 
         buttonLayout.add(startBtn, logoutBtn);
         container.add(buttonLayout);
     }
 
     private void setupEmulatorContainer(Div container) {
-        emulatorContainer.getStyle()
+        emulatorContainer.getStyle().set("border", "2px solid #e9ecef").set("border-radius", "8px")
-            .set("border", "2px solid #e9ecef")
+                .set("background-color", "#ffffff").set("box-shadow", "0 2px 4px rgba(0,0,0,0.1)")
-            .set("border-radius", "8px")
+                .set("overflow", "hidden").set("display", "none").set("flex-grow", "1").set("margin-bottom", "16px");
-            .set("background-color", "#ffffff")
-            .set("box-shadow", "0 2px 4px rgba(0,0,0,0.1)")
-            .set("overflow", "hidden")
-            .set("display", "none")
-            .set("flex-grow", "1")
-            .set("margin-bottom", "16px");
 
         webView.setSizeFull();
         ensureWebViewScrollbarsHidden();
@@ -172,26 +205,19 @@ public final class MainView extends Main implements BeforeEnterObserver
         webView.addClassName("mainview-webview");
         webView.getElement().setAttribute("frameborder", "0");
         webView.getElement().setAttribute("scrolling", "no");
-        webView.getElement().getStyle()
+        webView.getElement().getStyle().set("border", "0").set("overflow", "hidden").set("-ms-overflow-style", "none")
-            .set("border", "0")
-            .set("overflow", "hidden")
-            .set("-ms-overflow-style", "none")
                 .set("scrollbar-width", "none");
 
         // Force-disable iframe scrollbars for all major engines
-        webView.getElement().executeJs(
+        webView.getElement().executeJs("const frame = this;"
-            "const frame = this;" +
+                + "frame.style.setProperty('overflow', 'hidden', 'important');"
-            "frame.style.setProperty('overflow', 'hidden', 'important');" +
+                + "frame.style.setProperty('scrollbar-width', 'none', 'important');"
-            "frame.style.setProperty('scrollbar-width', 'none', 'important');" +
+                + "frame.style.setProperty('-ms-overflow-style', 'none', 'important');"
-            "frame.style.setProperty('-ms-overflow-style', 'none', 'important');" +
+                + "frame.classList.add('mainview-webview');"
-            "frame.classList.add('mainview-webview');" +
+                + "if (!document.getElementById('mainview-webview-scroll-style')) {"
-            "if (!document.getElementById('mainview-webview-scroll-style')) {" +
+                + "  const style = document.createElement('style');" + "  style.id = 'mainview-webview-scroll-style';"
-            "  const style = document.createElement('style');" +
+                + "  style.textContent = '.mainview-webview { overflow: hidden !important; scrollbar-width: none !important; -ms-overflow-style: none !important; } .mainview-webview::-webkit-scrollbar { display: none !important; width: 0 !important; height: 0 !important; }';"
-            "  style.id = 'mainview-webview-scroll-style';" +
+                + "  document.head.appendChild(style);" + "}");
-            "  style.textContent = '.mainview-webview { overflow: hidden !important; scrollbar-width: none !important; -ms-overflow-style: none !important; } .mainview-webview::-webkit-scrollbar { display: none !important; width: 0 !important; height: 0 !important; }';" +
-            "  document.head.appendChild(style);" +
-            "}"
-        );
     }
 
     private void loadSessionData() {
@@ -201,6 +227,29 @@ public final class MainView extends Main implements BeforeEnterObserver
             username = (String) vaadinSession.getAttribute("username");
             niederlassung = (NiederlassungInfo) vaadinSession.getAttribute("niederlassung");
             server = (String) vaadinSession.getAttribute("server");
+
+            // Fallback: Nach Reload Niederlassung anhand der aktiven Sessions rekonstruieren
+            if (niederlassung == null) {
+                try {
+                    String sid = (String) vaadinSession.getAttribute("sessionId");
+                    if (sid == null && vaadinSession.getSession() != null) {
+                        sid = vaadinSession.getSession().getId();
+                    }
+                    if (sid != null) {
+                        String nlName = Application.activeSessions.get(sid);
+                        if (nlName != null) {
+                            NiederlassungInfo info = Application.niederlassungen.get(nlName);
+                            if (info != null) {
+                                niederlassung = info;
+                                vaadinSession.setAttribute("niederlassung", info);
+                                logger.info("Niederlassung nach Reload wiederhergestellt: {}", info.name());
+                            }
+                        }
+                    }
+                } catch (Exception e) {
+                    logger.warn("Fehler bei der Rekonstruktion der Niederlassung", e);
+                }
+            }
         } else {
             logger.error("UI nicht verfügbar - kann Session-Daten nicht laden");
         }
@@ -213,10 +262,25 @@ public final class MainView extends Main implements BeforeEnterObserver
         logger.info("Username: {}", username);
         logger.info("Niederlassung: {}", (niederlassung != null ? niederlassung.name() : "null"));
         logger.info("Server: {}", server);
+        // Wichtig: Kein Redirect mehr hier. Falls keine Daten da sind, bleibt der Nutzer auf Main.
+    }
 
-        if (niederlassung == null) {
+    private void restoreUIStateIfNeeded() {
-            logger.error("FEHLER: Niederlassung ist null! Benutzer muss sich neu anmelden.");
+        var uiOpt = getUI();
-            getUI().ifPresent(ui -> ui.navigate("login"));
+        if (uiOpt.isEmpty()) return;
+        var session = uiOpt.get().getSession();
+
+        boolean emulatorStarted = Boolean.TRUE.equals(session.getAttribute("emulatorStarted"));
+        if (emulatorStarted && niederlassung != null) {
+            // UI in gestarteten Zustand versetzen
+            welcomeMessage.getStyle().set("display", "none");
+            emulatorContainer.getStyle().set("display", "block");
+            if (startBtn != null) {
+                startBtn.setEnabled(false);
+                startBtn.setText("Emulator gestartet");
+            }
+            // WebView aktualisieren (baut URL aus der Niederlassung)
+            refreshWebView();
         }
     }
 
@@ -236,8 +300,7 @@ public final class MainView extends Main implements BeforeEnterObserver
 
         executor.submit(() -> {
             try {
-                shutdown();
+                if (!isContainerStarted(niederlassung)) {
-
                     createContainer();
 
                     startContainer();
@@ -247,7 +310,7 @@ public final class MainView extends Main implements BeforeEnterObserver
                     downloadApp();
 
                     installApp();
-
+                }
             } catch (Exception ex) {
                 // Logging, Fehlerbehandlung …
             } finally {
@@ -262,6 +325,9 @@ public final class MainView extends Main implements BeforeEnterObserver
                     // Button bleibt dauerhaft deaktiviert
                     startBtn.setText("Emulator gestartet");
 
+                    // Zustand merken, damit Reload weiterfuehrt
+                    ui.getSession().setAttribute("emulatorStarted", true);
+
                     refreshWebView();
                 });
             }
@@ -295,16 +361,16 @@ public final class MainView extends Main implements BeforeEnterObserver
 
             String jsonPayload = """
                     {
-              "Cmd": ["curl", "-O", "https://www.appcreation.de/download/sb.apk"],
+                          "Cmd": ["curl", "-O", "http://172.16.0.156:5487/downloads/sb.apk"],
                           "AttachStdout": true,
                           "AttachStderr": true
                     }""";
 
             // HTTP-Request erstellen
             HttpRequest request = HttpRequest.newBuilder()
-                    .uri(URI.create("http://" + server + ":2375/containers/android-container-" + niederlassung.name() + "/exec"))
+                    .uri(URI.create("http://" + server + ":2375/containers/android-container-" + niederlassung.name()
-                    .header("Content-Type", "application/json")
+                            + "/exec"))
-                    .POST(HttpRequest.BodyPublishers.ofString(jsonPayload))
+                    .header("Content-Type", "application/json").POST(HttpRequest.BodyPublishers.ofString(jsonPayload))
                     .build();
 
             // Anfrage senden und Antwort verarbeiten
@@ -335,9 +401,9 @@ public final class MainView extends Main implements BeforeEnterObserver
                 }""";
 
         HttpRequest request = HttpRequest.newBuilder()
-                .uri(URI.create("http://" + server + ":2375/containers/android-container-" + niederlassung.name() + "/exec"))
+                .uri(URI.create(
-                .header("Content-Type", "application/json")
+                        "http://" + server + ":2375/containers/android-container-" + niederlassung.name() + "/exec"))
-                .POST(HttpRequest.BodyPublishers.ofString(jsonPayload))
+                .header("Content-Type", "application/json").POST(HttpRequest.BodyPublishers.ofString(jsonPayload))
                 .build();
 
         try {
@@ -358,9 +424,7 @@ public final class MainView extends Main implements BeforeEnterObserver
 
         HttpRequest request = HttpRequest.newBuilder()
                 .uri(URI.create("http://" + server + ":2375/exec/" + execId + "/start"))
-                .POST(HttpRequest.BodyPublishers.noBody())
+                .POST(HttpRequest.BodyPublishers.noBody()).version(HttpClient.Version.HTTP_1_1).build();
-                .version(HttpClient.Version.HTTP_1_1)
-                .build();
 
         try {
             HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
@@ -379,7 +443,8 @@ public final class MainView extends Main implements BeforeEnterObserver
         HttpClient client = HttpClient.newHttpClient();
 
         HttpRequest request = HttpRequest.newBuilder()
-                .uri(URI.create("http://" + server + ":2375/containers/android-container-" + niederlassung.name() + "/start"))
+                .uri(URI.create(
+                        "http://" + server + ":2375/containers/android-container-" + niederlassung.name() + "/start"))
                 .POST(HttpRequest.BodyPublishers.noBody()) // Kein Body wird gesendet
                 .build();
 
@@ -407,10 +472,10 @@ public final class MainView extends Main implements BeforeEnterObserver
                         }""";
 
                 HttpRequest request = HttpRequest.newBuilder()
-                        .uri(URI.create("http://" + server + ":2375/containers/android-container-" + niederlassung.name() + "/exec"))
+                        .uri(URI.create("http://" + server + ":2375/containers/android-container-"
+                                + niederlassung.name() + "/exec"))
                         .header("Content-Type", "application/json")
-                        .POST(HttpRequest.BodyPublishers.ofString(jsonPayload))
+                        .POST(HttpRequest.BodyPublishers.ofString(jsonPayload)).build();
-                        .build();
 
                 HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
                 logger.info("HTTP-Response-Code: {}", response.statusCode());
@@ -449,7 +514,7 @@ public final class MainView extends Main implements BeforeEnterObserver
                     "HostConfig": {
                         "NetworkMode": "votianBridge",
                         "Memory": 10737418240,
-                "CpuCount": 4,
+                        "NanoCpus": 4000000000,
                         "Dns": [
                             "172.18.0.15"
                         ],
@@ -494,9 +559,9 @@ public final class MainView extends Main implements BeforeEnterObserver
 
         // HTTP-Request erstellen
         HttpRequest request = HttpRequest.newBuilder()
-                .uri(URI.create("http://" + server + ":2375/containers/create?name=android-container-" + niederlassung.name()))
+                .uri(URI.create(
-                .header("Content-Type", "application/json")
+                        "http://" + server + ":2375/containers/create?name=android-container-" + niederlassung.name()))
-                .POST(HttpRequest.BodyPublishers.ofString(jsonPayload))
+                .header("Content-Type", "application/json").POST(HttpRequest.BodyPublishers.ofString(jsonPayload))
                 .build();
 
         // Anfrage senden und Antwort verarbeiten
@@ -513,7 +578,8 @@ public final class MainView extends Main implements BeforeEnterObserver
         HttpClient client = HttpClient.newHttpClient();
 
         HttpRequest request = HttpRequest.newBuilder()
-                .uri(URI.create("http://" + server + ":2375/containers/android-container-" + niederlassung.name() + "/stop"))
+                .uri(URI.create(
+                        "http://" + server + ":2375/containers/android-container-" + niederlassung.name() + "/stop"))
                 .POST(HttpRequest.BodyPublishers.noBody()) // Kein Body wird gesendet
                 .build();
 
@@ -530,7 +596,8 @@ public final class MainView extends Main implements BeforeEnterObserver
         HttpClient client = HttpClient.newHttpClient();
 
         HttpRequest request = HttpRequest.newBuilder()
-                .uri(URI.create("http://" + server + ":2375/containers/android-container-" + niederlassung.name() + "?force=true"))
+                .uri(URI.create("http://" + server + ":2375/containers/android-container-" + niederlassung.name()
+                        + "?force=true"))
                 .DELETE() // Kein Body wird gesendet
                 .build();
 
@@ -542,18 +609,103 @@ public final class MainView extends Main implements BeforeEnterObserver
             logger.error("Fehler beim HTTP-Request", e);
         }
     }
+    private String buildContainerName(NiederlassungInfo info) {
+        return "android-container-" + info.name();
+    }
+
+    private boolean isContainerStarted(NiederlassungInfo info) {
+        if (info == null) {
+            logger.warn("isContainerStarted: Niederlassung ist null");
+            return false;
+        }
+        String srv = (this.server != null ? this.server : "172.16.0.158");
+        String name = buildContainerName(info);
+        try {
+            HttpClient client = HttpClient.newHttpClient();
+            HttpRequest request = HttpRequest.newBuilder()
+                    .uri(URI.create("http://" + srv + ":2375/containers/" + name + "/json"))
+                    .GET()
+                    .build();
+            HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
+            int status = response.statusCode();
+            logger.info("Inspect-Container '{}': status={} ", name, status);
+            if (status == 200) {
+                String body = response.body();
+                // Simple check: look for State.Running = true
+                boolean running = body != null && body.contains("\"Running\":true");
+                logger.info("Inspect-Container '{}': running={}", name, running);
+                return running;
+            } else if (status == 404) {
+                // Container existiert nicht
+                return false;
+            }
+        } catch (Exception e) {
+            logger.warn("Fehler beim Prüfen des Container-Status für '{}': {}", name, e.toString());
+        }
+        return false;
+    }
+
 
     private Dialog showWaitDialog(String message) {
         Dialog dialog = new Dialog();
-        dialog.setHeaderTitle("Bitte warten");
         dialog.setModal(true);
         dialog.setCloseOnOutsideClick(false);
-        dialog.setCloseOnOutsideClick(false);
+        dialog.setCloseOnEsc(false);
+        dialog.setDraggable(false);
+        dialog.setResizable(false);
 
-        VerticalLayout dialogLayout = new VerticalLayout(
+        // Dialog-Styling
-                new Paragraph(message)
+        dialog.getElement().getStyle().set("border-radius", "16px").set("box-shadow", "0 20px 40px rgba(0,0,0,0.3)")
-        );
+                .set("background", "rgba(255,255,255,0.95)").set("backdrop-filter", "blur(10px)");
-        dialog.add(dialogLayout);
+
+        // Haupt-Container
+        VerticalLayout mainContainer = new VerticalLayout();
+        mainContainer.setSpacing(false);
+        mainContainer.setPadding(false);
+        mainContainer.setAlignItems(VerticalLayout.Alignment.CENTER);
+        mainContainer.getStyle().set("padding", "40px").set("min-width", "400px").set("text-align", "center");
+
+        // Animiertes Icon
+        Icon loadingIcon = new Icon(VaadinIcon.COG);
+        loadingIcon.setSize("48px");
+        loadingIcon.getStyle().set("color", "#667eea").set("margin-bottom", "20px").set("animation",
+                "spin 2s linear infinite");
+
+        // CSS-Animation für das Icon
+        dialog.getElement().executeJs(
+                """
+                            if (!document.getElementById('spin-animation')) {
+                                const style = document.createElement('style');
+                                style.id = 'spin-animation';
+                                style.textContent = '@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }';
+                                document.head.appendChild(style);
+                            }
+                        """);
+
+        // Titel
+        H3 title = new H3("Bitte warten");
+        title.getStyle().set("margin", "0 0 12px 0").set("color", "#333333").set("font-size", "1.5rem")
+                .set("font-weight", "600");
+
+        // Nachricht
+        Paragraph messageText = new Paragraph(message);
+        messageText.getStyle().set("margin", "0 0 24px 0").set("color", "#666666").set("font-size", "1rem")
+                .set("line-height", "1.5");
+
+        // Indeterminate Progress Bar
+        ProgressBar progressBar = new ProgressBar();
+        progressBar.setIndeterminate(true);
+        progressBar.setWidthFull();
+        progressBar.getStyle().set("margin-bottom", "16px");
+
+        // Status-Text
+        Paragraph statusText = new Paragraph("Vorgang wird ausgeführt...");
+        statusText.getStyle().set("margin", "0").set("color", "#888888").set("font-size", "0.875rem").set("font-style",
+                "italic");
+
+        // Alle Komponenten hinzufügen
+        mainContainer.add(loadingIcon, title, messageText, progressBar, statusText);
+        dialog.add(mainContainer);
 
         dialog.open();
 
@@ -584,19 +736,44 @@ public final class MainView extends Main implements BeforeEnterObserver
                             dialog.close();
 
                             // Session cleanup erst nach Shutdown
+                            String sessionId = (String) ui.getSession().getAttribute("sessionId");
+                            if (sessionId != null) {
+                                Application.activeSessions.remove(sessionId);
+                                logger.info("Session {} aus aktiven Sessions entfernt", sessionId);
+                                Application.sessionsById.remove(sessionId);
+
+                            }
                             if (niederlassung != null) {
                                 Application.activeNiederlassungen.remove(niederlassung.name());
-                                logger.info("Niederlassung {} aus aktiven Niederlassungen entfernt", niederlassung.name());
+                                logger.info("Niederlassung {} aus aktiven Niederlassungen entfernt",
-                            }
+                                        niederlassung.name());
-                            if (username != null) {
-                                Application.activeUsers.remove(username);
-                                logger.info("Benutzer {} aus aktiven Benutzern entfernt", username);
                             }
+                            logger.info("Aktive Sessions nach Logout: {}/{}", Application.activeSessions.size(),
+                                    Application.MAX_ACTIVE_SESSIONS);
 
-                            // Session invalidieren und weiterleiten erst ganz am Ende
+                            // 1) Client-seitigen Redirect sofort ausführen (wird beim Client direkt verarbeitet)
-                            ui.getSession().getSession().invalidate();
+                            var httpSession = ui.getSession().getSession();
-                            logger.info("Session invalidiert - Weiterleitung zur Login-Seite");
+                            var vaadinSession = ui.getSession();
-                            ui.getPage().setLocation("login");
+                            ui.getPage().executeJs("window.location.replace($0);", "login");
+
+                            // 2) Session-Schließung leicht verzögert im Hintergrund, damit der Redirect sicher ankommt
+                            executor.submit(() -> {
+                                try {
+                                    Thread.sleep(300); // kurze Verzögerung reicht i.d.R.
+                                } catch (InterruptedException ignored) {
+                                }
+                                try {
+                                    vaadinSession.close();
+                                } catch (Exception e) {
+                                    logger.warn("Fehler beim Schließen der VaadinSession nach Redirect", e);
+                                }
+                                try {
+                                    httpSession.invalidate();
+                                } catch (Exception e) {
+                                    logger.warn("Fehler beim Invalidieren der HttpSession nach Redirect", e);
+                                }
+                                logger.info("Session nach Redirect geschlossen/invalidiert");
+                            });
 
                         } catch (Exception ex) {
                             logger.error("Fehler beim Logout UI-Update", ex);

src/main/java/de/assecutor/emulatorstation/base/ui/view/RootView.java

@@ -12,5 +12,3 @@ public class RootView implements BeforeEnterObserver {
         event.rerouteTo("main");
     }
 }
-
-

src/main/java/de/assecutor/emulatorstation/base/ui/view/security/SecurityConfig.java

@@ -4,6 +4,7 @@ import com.vaadin.flow.spring.security.VaadinWebSecurity;
 import de.assecutor.emulatorstation.base.ui.view.LoginView;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.web.authentication.session.SessionFixationProtectionStrategy;
 
 import de.assecutor.emulatorstation.Application;
 
@@ -16,19 +17,19 @@ public class SecurityConfig extends VaadinWebSecurity {
 
         setLoginView(http, LoginView.class);
 
-        http
+        http.sessionManagement(session -> session
-            .logout(logout -> logout
+                // Wichtig: Session-Fixation so konfigurieren, dass Session-Attribute (z.B. "user") erhalten bleiben
-                .logoutSuccessUrl("/login")
+                .sessionFixation(fixation -> fixation.migrateSession())
-                .addLogoutHandler((request, response, authentication) -> {
+                .maximumSessions(Application.MAX_ACTIVE_SESSIONS)
+                .maxSessionsPreventsLogin(false))
+            .logout(
+                logout -> logout.logoutSuccessUrl("/login").addLogoutHandler((request, response, authentication) -> {
                     if (authentication != null) {
                         String username = authentication.getName();
-                        Application.activeNiederlassungen.entrySet().removeIf(entry ->
+                        Application.activeNiederlassungen.entrySet()
-                            entry.getValue().equals(username));
+                                .removeIf(entry -> entry.getValue().equals(username));
                     }
-                })
+                }));
-            );
     }
 
 }
-
-

src/main/java/de/assecutor/emulatorstation/base/ui/view/security/SessionListener.java

@@ -13,9 +13,14 @@ public class SessionListener implements SessionDestroyListener {
     public void sessionDestroy(SessionDestroyEvent event) {
         String username = (String) event.getSession().getAttribute("user");
         NiederlassungInfo niederlassung = (NiederlassungInfo) event.getSession().getAttribute("niederlassung");
+        String sessionId = (String) event.getSession().getAttribute("sessionId");
 
         if (username != null && niederlassung != null) {
             Application.activeNiederlassungen.remove(niederlassung.name());
         }
+        if (sessionId != null) {
+            Application.activeSessions.remove(sessionId);
+            Application.sessionsById.remove(sessionId);
+        }
     }
 }

src/main/java/de/assecutor/emulatorstation/base/ui/view/security/VaadinAccessHandler.java

@@ -52,5 +52,3 @@ public class VaadinAccessHandler {
         }
     }
 }
-
-

src/main/java/de/assecutor/emulatorstation/pojo/ExecResponse.java

@@ -15,6 +15,11 @@ public class ExecResponse {
     }
 
     // Getter und Setter
-    public String getId() { return id; }
+    public String getId() {
-    public void setId(String id) { this.id = id; }
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
 }

src/main/java/de/assecutor/emulatorstation/pojo/NiederlassungInfo.java

@@ -3,8 +3,7 @@ package de.assecutor.emulatorstation.pojo;
 import java.io.Serial;
 import java.io.Serializable;
 
-public record NiederlassungInfo(String name, String ip, String port, String urlExtension)
+public record NiederlassungInfo(String name, String ip, String port, String urlExtension) implements Serializable {
-        implements Serializable {
 
     @Serial
     private static final long serialVersionUID = 1L;

src/main/java/de/assecutor/emulatorstation/pojo/UserInfo.java

@@ -2,5 +2,3 @@ package de.assecutor.emulatorstation.pojo;
 
 public record UserInfo(String password) {
 }
-
-

src/main/java/util/Util.java

@@ -2,14 +2,15 @@ package util;
 
 import com.vaadin.flow.server.WrappedSession;
 
-
 public class Util {
-    public static String getSessionAttributeWithDefault(WrappedSession currentSession, String key, String defaultValue) {
+    public static String getSessionAttributeWithDefault(WrappedSession currentSession, String key,
+            String defaultValue) {
         var result = defaultValue;
 
         try {
             result = currentSession.getAttribute(key).toString();
-        } catch (Exception e) {}
+        } catch (Exception e) {
+        }
 
         return result;
     }

src/main/resources/application-prod.properties

@@ -0,0 +1,7 @@
+# Production overrides
+# - Secure session cookie only over HTTPS
+# - SameSite policy for CSRF protection and to avoid third-party sending
+
+server.servlet.session.cookie.secure=true
+server.servlet.session.cookie.same-site=lax
+

src/main/resources/application.properties

@@ -13,5 +13,19 @@ spring.jpa.open-in-view=false
 # Initialize the JPA Entity Manager before considering data.sql so that the EM can create the schema and data.sql contain data
 spring.jpa.defer-datasource-initialization = true
 
-server.servlet.session.timeout=300s
+# Session configuration - preserve session on browser reload
+server.servlet.session.timeout=0
+
+server.servlet.session.cookie.max-age=180d
+
+server.servlet.session.cookie.http-only=true
+server.servlet.session.cookie.secure=false
+server.servlet.session.persistent=true
+
+# Vaadin session configuration
 vaadin.heartbeatInterval=300
+vaadin.closeIdleSessions=false
+
+
+# Disable Spring Boot's default generated user/password (we handle auth via Vaadin & custom login)
+spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.security.servlet.UserDetailsServiceAutoConfiguration

tsconfig.json

@@ -0,0 +1,39 @@
+// This TypeScript configuration file is generated by vaadin-maven-plugin.
+// This is needed for TypeScript compiler to compile your TypeScript code in the project.
+// It is recommended to commit this file to the VCS.
+// You might want to change the configurations to fit your preferences
+// For more information about the configurations, please refer to http://www.typescriptlang.org/docs/handbook/tsconfig-json.html
+{
+  "_version": "9.1",
+  "compilerOptions": {
+    "sourceMap": true,
+    "jsx": "react-jsx",
+    "inlineSources": true,
+    "module": "esNext",
+    "target": "es2022",
+    "moduleResolution": "bundler",
+    "strict": true,
+    "skipLibCheck": true,
+    "noFallthroughCasesInSwitch": true,
+    "noImplicitReturns": true,
+    "noImplicitAny": true,
+    "noImplicitThis": true,
+    "noUnusedLocals": false,
+    "noUnusedParameters": false,
+    "experimentalDecorators": true,
+    "useDefineForClassFields": false,
+    "baseUrl": "src/main/frontend",
+    "paths": {
+      "@vaadin/flow-frontend": ["generated/jar-resources"],
+      "@vaadin/flow-frontend/*": ["generated/jar-resources/*"],
+      "Frontend/*": ["*"]
+    }
+  },
+  "include": [
+    "src/main/frontend/**/*",
+    "types.d.ts"
+  ],
+  "exclude": [
+    "src/main/frontend/generated/jar-resources/**"
+  ]
+}

types.d.ts

@@ -0,0 +1,17 @@
+// This TypeScript modules definition file is generated by vaadin-maven-plugin.
+// You can not directly import your different static files into TypeScript,
+// This is needed for TypeScript compiler to declare and export as a TypeScript module.
+// It is recommended to commit this file to the VCS.
+// You might want to change the configurations to fit your preferences
+declare module '*.css?inline' {
+  import type { CSSResultGroup } from 'lit';
+  const content: CSSResultGroup;
+  export default content;
+}
+
+// Allow any CSS Custom Properties
+declare module 'csstype' {
+  interface Properties {
+    [index: `--${string}`]: any;
+  }
+}