Easier Infinispan clusters on same JVM with Infinispan 9.2

Since Infinispan 5.2.0, Infinispan registers JMX MBeans by default even if statistics are disabled. This was done so that management related operations could be called even if statistics were disabled.

This change resulted in a small usability problem for those users that wanted to create a cluster of Infinispan instances on the same JVM. This is a very common use case when first starting to use Infinispan or when trying to create some unit tests.

When multiple Infinispan instances run on same JVM, they would all try to register JMX MBeans but unless you explicitly gave each Infinispan instance a different CacheManager name, you’d see exceptions like this:

Caused by: org.infinispan.jmx.JmxDomainConflictException: ISPN000034: There’s already a JMX MBean instance type=Cache,name="___defaultcache(repl_sync)",manager="DefaultCacheManager" already registered under 'org.infinispan' JMX domain…​

Starting with Infinispan 9.2.0, duplicate JMX domains are allowed by default, so you won’t need to fiddle with JMX domain settings any more to create an Infinispan cluster on the same JVM :)

Cheers, Galder

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