Default Writer Requires Additional Dependency

When starting a kieker instrumented application with the javaagent like -javaagent:~/.m2/repository/net/kieker-monitoring/kieker/1.15-SNAPSHOT/kieker-1.15-SNAPSHOT-aspectj.jar (or with source instrumentation), many projects get exceptions like this:

{{Exception in thread "main" java.lang.ExceptionInInitializerError
at kieker.monitoring.core.controller.MonitoringController.getInstance(MonitoringController.java:404)
at kieker.monitoring.probe.aspectj.flow.operationExecution.AbstractAspect.<clinit>(AbstractAspect.java:42)
at org.openjdk.jmh.runner.ForkedMain.main(ForkedMain.java:55)
Caused by: java.lang.IllegalStateException: java.lang.ClassNotFoundException: org.jctools.queues.MpscArrayQueue
at kieker.monitoring.core.controller.WriterController.newQueue(WriterController.java:247)
at kieker.monitoring.core.controller.WriterController.<init>(WriterController.java:110)
at kieker.monitoring.core.controller.MonitoringController.<init>(MonitoringController.java:72)
at kieker.monitoring.core.controller.MonitoringController.createInstance(MonitoringController.java:92)
at kieker.monitoring.core.controller.MonitoringController$SingletonHelper.<clinit>(MonitoringController.java:412)
... 3 more
Caused by: java.lang.ClassNotFoundException: org.jctools.queues.MpscArrayQueue
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:315)
at kieker.monitoring.core.controller.WriterController.newQueue(WriterController.java:238)
... 7 more}}

To overcome this, one needs to add the jctools dependency:

{{ <dependency>
<groupId>org.jctools</groupId>
<artifactId>jctools-core</artifactId>
<version>3.3.0</version>
</dependency>}}

to the project or change the RecordQueueFQN e.g. by
-Dkieker.monitoring.core.controller.WriterController.RecordQueueFQN=java.util.concurrent.ArrayBlockingQueue

I would recommend to either add the required class to the jar or to change the default queue implementation to java.util.concurrent.ArrayBlockingQueue by editing kieker.monitoring.default.properties.