When it is running from 6.0.0-SNAPSHOT to 6.0.0-SNAPSHOT it is ok. It looks like some back-porting compatibility issue.

See stacktrace:

javax.management.MBeanException
at org.infinispan.jmx.ResourceDMBean.invoke(ResourceDMBean.java:273)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:791)
at org.jboss.as.jmx.PluggableMBeanServerImpl$TcclMBeanServer.invoke(PluggableMBeanServerImpl.java:527)
at org.jboss.as.jmx.PluggableMBeanServerImpl.invoke(PluggableMBeanServerImpl.java:263)
at org.jboss.remotingjmx.protocol.v2.ServerProxy$InvokeHandler.handle(ServerProxy.java:915)
at org.jboss.remotingjmx.protocol.v2.ServerCommon$MessageReciever$1.run(ServerCommon.java:152)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.infinispan.jmx.ResourceDMBean.invoke(ResourceDMBean.java:271)
... 9 more
Caused by: org.infinispan.commons.CacheException: java.lang.ClassNotFoundException: org.infinispan.util.ByteArrayKey from [Module "org.infinispan:main" from local module loader @4099a992 (finder: local module finder @284bd160 (roots: /home/tsykora/programs/eclipseWorkspace/Infinispan-server-tsykora/infinispan-server/testsuite/target/server/node1/modules,/home/tsykora/programs/eclipseWorkspace/Infinispan-server-tsykora/infinispan-server/testsuite/target/server/node1/modules/system/layers/base))]
at org.infinispan.persistence.remote.upgrade.HotRodTargetMigrator.synchronizeData(HotRodTargetMigrator.java:63)
at org.infinispan.upgrade.RollingUpgradeManager.synchronizeData(RollingUpgradeManager.java:59)
... 14 more
Caused by: java.lang.ClassNotFoundException: org.infinispan.util.ByteArrayKey from [Module "org.infinispan:main" from local module loader @4099a992 (finder: local module finder @284bd160 (roots: /home/tsykora/programs/eclipseWorkspace/Infinispan-server-tsykora/infinispan-server/testsuite/target/server/node1/modules,/home/tsykora/programs/eclipseWorkspace/Infinispan-server-tsykora/infinispan-server/testsuite/target/server/node1/modules/system/layers/base))]
at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:190)
at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:468)
at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:456)
at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:398)
at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:120)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at org.jboss.marshalling.AbstractClassResolver.loadClass(AbstractClassResolver.java:135)
at org.jboss.marshalling.AbstractClassResolver.resolveClass(AbstractClassResolver.java:116)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadClassDescriptor(RiverUnmarshaller.java:947)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadNewObject(RiverUnmarshaller.java:1259)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:276)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:213)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadCollectionObject(RiverUnmarshaller.java:184)
at org.jboss.marshalling.river.RiverUnmarshaller.readCollectionData(RiverUnmarshaller.java:777)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:656)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:213)
at org.jboss.marshalling.AbstractObjectInput.readObject(AbstractObjectInput.java:37)
at org.infinispan.commons.marshall.jboss.AbstractJBossMarshaller.objectFromObjectStream(AbstractJBossMarshaller.java:140)
at org.infinispan.commons.marshall.jboss.AbstractJBossMarshaller.objectFromByteBuffer(AbstractJBossMarshaller.java:118)
at org.infinispan.commons.marshall.AbstractMarshaller.objectFromByteBuffer(AbstractMarshaller.java:82)
at org.infinispan.persistence.remote.upgrade.HotRodTargetMigrator.synchronizeData(HotRodTargetMigrator.java:61)
... 15 more