TS-31571 Daemonzie logging

agent/src/main/java/com/teamscale/jacoco/agent/logging/LogToTeamscaleAppender.java

@@ -21,7 +21,16 @@ public class LogToTeamscaleAppender extends AppenderBase<ILoggingEvent> {
 	private int batchSize = 10;
 	private Duration flushInterval = Duration.ofSeconds(3);
 	private final List<ProfilerLogEntry> logBuffer = new ArrayList<>();
-	private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
+	private final ScheduledExecutorService scheduler;
+
+	public LogToTeamscaleAppender() {
+		this.scheduler = Executors.newScheduledThreadPool(1, r -> {
+			// Make the thread a daemon so that it does not prevent the JVM from terminating.
+			Thread t = Executors.defaultThreadFactory().newThread(r);
+			t.setDaemon(true);
+			return t;
+		});
+	}
 
 	public void setTeamscaleClient(TeamscaleClient teamscaleClient) {
 		this.teamscaleClient = teamscaleClient;
@@ -114,5 +123,4 @@ public static void addTeamscaleAppenderTo(LoggerContext context, AgentOptions ag
 		rootLogger.addAppender(logToTeamscaleAppender);
 	}
 
-
 }

system-tests/teamscale-profiler-configuration-test/src/test/java/com/teamscale/client/TeamscaleProfilerConfigurationSystemTest.java

@@ -36,8 +36,9 @@ public void systemTestRetrieveConfig() throws Exception {
 
 		teamscaleMockServer.shutdown();
 
-		assertThat(teamscaleMockServer.getProfilerEvents()).containsExactly(
-				"Profiler registered and requested configuration my-config", "Profiler 123 sent heartbeat",
+		assertThat(teamscaleMockServer.getProfilerEvents()).as("We expect a sequence of interactions with the mock. " +
+				"Note that unexpected interactions can be caused by old agent instances that have not been killed properly.") //
+				.containsExactly("Profiler registered and requested configuration my-config", "Profiler 123 sent heartbeat",
 				"Profiler 123 unregistered");
 	}