Add review suggestions

java/operator/org.eclipse.theia.cloud.operator/src/main/java/org/eclipse/theia/cloud/operator/plugins/MonitorActivityTracker.java

@@ -29,7 +29,6 @@
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
-import java.util.stream.Collectors;
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
@@ -82,8 +81,7 @@ public void start() {
     protected void pingAllSessions() {
         // Only look at handled sessions (handled sessions have a lastActivity)
         List<Session> sessions = resourceClient.sessions().list().stream()
-                .filter(session -> OperatorStatus.HANDLED.equals(session.getStatus().getOperatorStatus()))
-                .collect(Collectors.toList());
+                .filter(session -> OperatorStatus.HANDLED.equals(session.getStatus().getOperatorStatus())).toList();
         String correlationId = generateCorrelationId();
 
         LOGGER.debug("Pinging sessions: " + sessions);

java/service/org.eclipse.theia.cloud.service/README.md

@@ -21,6 +21,7 @@ When you have the service running in dev mode you can use the `Attach to Service
 Check the [OpenAPI documentation](../../../documentation/OpenAPI.md) to see how you can send requests to the service.
 
 _Note_: The landing page will not communicate with this service, as it will be hosted on another address.
+Checkout the [testing-page](../../../node/testing-page/README.md) to test requests against the server.
 
 ## Packaging and running the application