Cluster cache serialisation problem com.atlassian.mywork.client.service.HostServiceImpl$HostType

Exception on replication of putNotification. RemoteException occurred in server thread; nested exception is:
        java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
        java.lang.ClassNotFoundException: com.atlassian.mywork.client.service.HostServiceImpl$HostType (no security manager: RMI class loader disabled).Continuing...

java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
        java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
        java.lang.ClassNotFoundException: com.atlassian.mywork.client.service.HostServiceImpl$HostType (no security manager: RMI class loader disabled)
        at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:354)
        at sun.rmi.transport.Transport$1.run(Transport.java:200)
        at sun.rmi.transport.Transport$1.run(Transport.java:197)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
        at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
        at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:276)
        at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:253)
        at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:162)
        at net.sf.ehcache.distribution.RMICachePeer_Stub.put(Unknown Source)
        at net.sf.ehcache.distribution.RMISynchronousCacheReplicator.replicatePutNotification(RMISynchronousCacheReplicator.java:149)
        at com.atlassian.cache.ehcache.replication.rmi.RMISynchronousCacheReplicator.replicateViaCopy(RMISynchronousCacheReplicator.java:60)
        at com.atlassian.cache.ehcache.replication.rmi.RMISynchronousCacheReplicator.notifyElementPut(RMISynchronousCacheReplicator.java:48)
        at net.sf.ehcache.event.RegisteredEventListeners.internalNotifyElementPut(RegisteredEventListeners.java:180)
        at net.sf.ehcache.event.RegisteredEventListeners.notifyElementPut(RegisteredEventListeners.java:158)
        at net.sf.ehcache.Cache.notifyPutInternalListeners(Cache.java:1532)
        at com.atlassian.cache.ehcache.replication.rmi.RMISynchronousCacheReplicator.notifyElementPut(RMISynchronousCacheReplicator.java:48)
        at net.sf.ehcache.event.RegisteredEventListeners.internalNotifyElementPut(RegisteredEventListeners.java:180)
        at net.sf.ehcache.event.RegisteredEventListeners.notifyElementPut(RegisteredEventListeners.java:158)
        at net.sf.ehcache.Cache.notifyPutInternalListeners(Cache.java:1532)
        at net.sf.ehcache.Cache.putInternal(Cache.java:1502)
        at net.sf.ehcache.Cache.put(Cache.java:1427)
        at net.sf.ehcache.Cache.put(Cache.java:1392)
        at com.atlassian.cache.ehcache.DelegatingCache.put(DelegatingCache.java:82)
        at com.atlassian.mywork.client.service.HostIdCache.setHost(HostIdCache.java:47)
        at com.atlassian.mywork.client.service.HostServiceImpl.setActiveHost(HostServiceImpl.java:216)
        at com.atlassian.mywork.client.service.HostServiceImpl.updateHostAvailability(HostServiceImpl.java:197)
        at com.atlassian.mywork.client.service.HostServiceImpl.enable(HostServiceImpl.java:102)
        at com.atlassian.mywork.client.service.ServiceSelectorImpl$2.run(ServiceSelectorImpl.java:194)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)

Caused by: java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
        java.lang.ClassNotFoundException: com.atlassian.mywork.client.service.HostServiceImpl$HostType (no security manager: RMI class loader disabled)
        at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:314)
        at sun.rmi.transport.Transport$1.run(Transport.java:200)
        at sun.rmi.transport.Transport$1.run(Transport.java:197)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
        ... 3 more

Caused by: java.lang.ClassNotFoundException: com.atlassian.mywork.client.service.HostServiceImpl$HostType (no security manager: RMI class loader disabled)
        at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:396)
        at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:186)
        at java.rmi.server.RMIClassLoader$2.loadClass(RMIClassLoader.java:637)
        at java.rmi.server.RMIClassLoader.loadClass(RMIClassLoader.java:264)
        at sun.rmi.server.MarshalInputStream.resolveClass(MarshalInputStream.java:214)
        at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1518)
        at java.io.ObjectInputStream.readEnum(ObjectInputStream.java:1726)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1348)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2000)
        at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:501)
        at net.sf.ehcache.Element.readObject(Element.java:860)
        ... 3 filtered

        at java.lang.reflect.Method.invoke(Method.java:498)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1058)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1900)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
        at sun.rmi.server.UnicastRef.unmarshalValue(UnicastRef.java:326)
        at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:308)
        ... 12 more