[jboss-jira] [JBoss JIRA] (JGRP-1715) NullPointerException in MessageDispatcher.handleUpEvent

NullPointerException in MessageDispatcher.handleUpEvent ------------------------------------------------------- Key: JGRP-1715 URL: https://issues.jboss.org/browse/JGRP-1715 Project: JGroups Issue Type: Bug Affects Versions: 3.4 Environment: Windows 7 x64 - JDK 1.7.0_40 Reporter: Pierantonio Cangianiello Assignee: Bela Ban Fix For: 3.4.2, 3.5 1) Node A starts and becomes master. 2) Node B starts and Node A crashes. 3) Before becoming the new master, Node B calls channel.getState() 4) NullPointer occurs Stacktrace: java.lang.NullPointerException at java.io.ByteArrayInputStream.<init>(ByteArrayInputStream.java:106) at org.jgroups.blocks.MessageDispatcher.handleUpEvent(MessageDispatcher.java:567) at org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.up(MessageDispatcher.java:667) at org.jgroups.JChannel.up(JChannel.java:643) at org.jgroups.stack.ProtocolStack.up(ProtocolStack.java:1015) at org.jgroups.protocols.Locking.up(Locking.java:269) at org.jgroups.protocols.pbcast.STATE_TRANSFER.handleViewChange(STATE_TRANSFER.java:293) at org.jgroups.protocols.pbcast.STATE_TRANSFER.up(STATE_TRANSFER.java:168) at org.jgroups.protocols.RSVP.up(RSVP.java:187) at org.jgroups.protocols.FRAG2.up(FRAG2.java:165) at org.jgroups.protocols.FlowControl.up(FlowControl.java:381) at org.jgroups.protocols.FlowControl.up(FlowControl.java:381) at org.jgroups.protocols.pbcast.GMS.castViewChange(GMS.java:574) at org.jgroups.protocols.pbcast.CoordGmsImpl.handleMembershipChange(CoordGmsImpl.java:219) at org.jgroups.protocols.pbcast.GMS$ViewHandler.process(GMS.java:1633) at org.jgroups.protocols.pbcast.GMS$ViewHandler.run(GMS.java:1587) at java.lang.Thread.run(Thread.java:724) The issue seems to be related to this: in STATE_TRANSFER, line 292-293: Exception ex=new EOFException("state provider " + old_coord + " left"); up_prot.up(new Event(Event.GET_STATE_OK, new StateTransferResult(ex))); (buffer field is not set on event object) after, in MessageDispatcher 567: ByteArrayInputStream input=new ByteArrayInputStream(result.getBuffer()); causes NullPointer, since result.getBuffer() returns null. A null-check here should resolve this issue, or an empty buffer could be set in StateTransferResult class.