Logging issue regarding EmbeddedHiveMQ in OSGi Environment

[janosch24]

Problem or use case

Incorporating EmbeddedHiveMQ in OSGi environment (such as equinox) might lead to ClassCastException during LoggingBootstrap if logback based logging is already setup in OSGi.

!STACK 0
java.util.concurrent.CompletionException: java.lang.ClassCastException: class ch.qos.logback.classic.LoggerContext cannot be cast to class ch.qos.logback.classic.LoggerContext (ch.qos.logback.classic.LoggerContext is in unnamed module of loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @f14a7d4; ch.qos.logback.classic.LoggerContext is in unnamed module of loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @673d71d5)
	at java.base/java.util.concurrent.CompletableFuture.reportJoin(CompletableFuture.java:413)
	at java.base/java.util.concurrent.CompletableFuture.join(CompletableFuture.java:2118)
...
	at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:343)
Caused by: java.lang.ClassCastException: class ch.qos.logback.classic.LoggerContext cannot be cast to class ch.qos.logback.classic.LoggerContext (ch.qos.logback.classic.LoggerContext is in unnamed module of loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @f14a7d4; ch.qos.logback.classic.LoggerContext is in unnamed module of loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @673d71d5)
	at com.hivemq.bootstrap.LoggingBootstrap.getRootLogger(LoggingBootstrap.java:145)
	at com.hivemq.bootstrap.LoggingBootstrap.prepareLogging(LoggingBootstrap.java:67)
...

Obviously this seems to be a class loading issue in OSGi environment. For a more detailed description, see this forum contribution.

Preferred solution or suggestions

From my point of view, two possible solutions are considerable:

1. Add a new method to EmbeddedHiveMQBuilder to programmatically switch off logging
2. Add a system property, such as hivemq.log.bootstrap.disabled to conditionally switch off logging

The latter one possibly might have less drawbacks regarding backward compatibility, as only class HiveMQServer has to get adjusted a little bit ...

[janosch24]

PS.: If desired I can work on this issue ...