During process of HotRod Rolling Upgrades from cluster of 2 JDG 6.1.GA nodes to 2 JDG 6.2.ER3.2 nodes, we are blocked by this exception while calling recordKnownGlobalKeyset operation on "old" cluster:

java.io.IOException: java.lang.ClassNotFoundException: org.infinispan.CacheException
at org.jboss.remotingjmx.protocol.v1.ClientConnection$BaseResponseHandler.handle(ClientConnection.java:1775)
at org.jboss.remotingjmx.protocol.v1.ClientConnection$MessageReceiver$1.run(ClientConnection.java:455)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.ClassNotFoundException: org.infinispan.CacheException
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
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.readFields(RiverUnmarshaller.java:1732)
at org.jboss.marshalling.river.RiverUnmarshaller.doInitSerializable(RiverUnmarshaller.java:1648)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadNewObject(RiverUnmarshaller.java:1290)
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.readFields(RiverUnmarshaller.java:1732)
at org.jboss.marshalling.river.RiverUnmarshaller.doInitSerializable(RiverUnmarshaller.java:1648)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadNewObject(RiverUnmarshaller.java:1290)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:276)
at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:213)
at org.jboss.marshalling.AbstractObjectInput.readObject(AbstractObjectInput.java:72)
at org.jboss.remotingjmx.protocol.v1.ClientConnection$BaseResponseHandler.handle(ClientConnection.java:1766)
... 4 more

This is also the same for Infinispan Server build from upstream, so it shouldn't be product specific.