Mockito is currently self-attaching to enable the inline-mock-maker. This will no longer work in future releases of the JDK. Please add Mockito as an agent to your build what is described in Mockito's documentation: https://javadoc.io/doc/org.mockito/mockito-core/latest/org/mockito/Mockito.html#0.3 WARNING: A Java agent has been loaded dynamically (/tmp/r/net/bytebuddy/byte-buddy-agent/1.15.4/byte-buddy-agent-1.15.4.jar) WARNING: If a serviceability tool is in use, please run with -XX:+EnableDynamicAgentLoading to hide this warning WARNING: If a serviceability tool is not in use, please run with -Djdk.instrument.traceUsage for more information WARNING: Dynamic loading of agents will be disallowed by default in a future release [main] ERROR org.opendaylight.mdsal.eos.binding.dom.adapter.DOMEntityOwnershipListenerAdapter - Listener Mock for EntityOwnershipListener, hashCode: 2042086224 failed on during Entity [type=foo, id=DataObjectIdentifier[ @ urn.opendaylight.params.xml.ns.yang.mdsal.core.general.entity.rev150930.Entity[EntityKey{name=bar}] ]] change LOCAL_OWNERSHIP_GRANTED [wasOwner=false, isOwner=true, hasOwner=true] java.lang.IllegalStateException