java.lang.NullPointerException: null
at org.jgroups.protocols.UNICAST2.handleBatchReceived(UNICAST2.java:847) ~[jgroups-3.3.0.Final.jar:3.3.0.Final]
at org.jgroups.protocols.UNICAST2.up(UNICAST2.java:481) ~[jgroups-3.3.0.Final.jar:3.3.0.Final]
at org.jgroups.protocols.pbcast.NAKACK2.up(NAKACK2.java:675) ~[jgroups-3.3.0.Final.jar:3.3.0.Final]
at org.jgroups.stack.Protocol.up(Protocol.java:406) ~[jgroups-3.3.0.Final.jar:3.3.0.Final]
at org.jgroups.protocols.FD.up(FD.java:274) ~[jgroups-3.3.0.Final.jar:3.3.0.Final]
at org.jgroups.stack.Protocol.up(Protocol.java:406) ~[jgroups-3.3.0.Final.jar:3.3.0.Final]
at org.jgroups.stack.Protocol.up(Protocol.java:406) ~[jgroups-3.3.0.Final.jar:3.3.0.Final]
at org.jgroups.protocols.DAISYCHAIN.up(DAISYCHAIN.java:183) ~[jgroups-3.3.0.Final.jar:3.3.0.Final]
at org.jgroups.stack.Protocol.up(Protocol.java:406) ~[jgroups-3.3.0.Final.jar:3.3.0.Final]
at org.jgroups.protocols.TP.passBatchUp(TP.java:1383) ~[jgroups-3.3.0.Final.jar:3.3.0.Final]
at org.jgroups.protocols.TP$BatchHandler.run(TP.java:1519) ~[jgroups-3.3.0.Final.jar:3.3.0.Final]
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) ~[na:1.6.0_26]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) ~[na:1.6.0_26]
at java.lang.Thread.run(Thread.java:662) ~[na:1.6.0_26]

• • • line 847 from UNICAST2:

if(added && total_len > 0 && entry.incrementStable(total_len) && win != null)

should be replaced with:

if(added && total_len > 0 && entry!=null && entry.incrementStable(total_len) && win != null)