java.lang.NullPointerException
	at org.hibernate.cache.spi.NaturalIdCacheKey.toString(NaturalIdCacheKey.java:123)
	at org.slf4j.helpers.MessageFormatter.safeObjectAppend(MessageFormatter.java:304)
	at org.slf4j.helpers.MessageFormatter.deeplyAppendParameter(MessageFormatter.java:276)
	at org.slf4j.helpers.MessageFormatter.arrayFormat(MessageFormatter.java:230)
	at org.slf4j.helpers.MessageFormatter.format(MessageFormatter.java:152)
	at org.slf4j.impl.JCLLoggerAdapter.trace(JCLLoggerAdapter.java:112)
	at net.sf.ehcache.distribution.jgroups.JGroupsCacheReceiver.handleEhcacheNotification(JGroupsCacheReceiver.java:170)
	at net.sf.ehcache.distribution.jgroups.JGroupsCacheReceiver.handleJGroupNotification(JGroupsCacheReceiver.java:145)
	at net.sf.ehcache.distribution.jgroups.JGroupsCacheReceiver.safeHandleJGroupNotification(JGroupsCacheReceiver.java:109)
	at net.sf.ehcache.distribution.jgroups.JGroupsCacheReceiver.receive(JGroupsCacheReceiver.java:82)
	at org.jgroups.JChannel.invokeCallback(JChannel.java:757)
	at org.jgroups.JChannel.up(JChannel.java:718)
	at org.jgroups.stack.ProtocolStack.up(ProtocolStack.java:1020)
	at org.jgroups.protocols.pbcast.STATE_TRANSFER.up(STATE_TRANSFER.java:178)
	at org.jgroups.protocols.RSVP.up(RSVP.java:192)
	at org.jgroups.protocols.FRAG2.up(FRAG2.java:181)
	at org.jgroups.protocols.FlowControl.up(FlowControl.java:400)
	at org.jgroups.protocols.FlowControl.up(FlowControl.java:418)
	at org.jgroups.protocols.pbcast.GMS.up(GMS.java:899)
	at org.jgroups.protocols.pbcast.STABLE.up(STABLE.java:244)
	at org.jgroups.protocols.UNICAST.up(UNICAST.java:414)
	at org.jgroups.protocols.pbcast.NAKACK2.handleMessage(NAKACK2.java:735)
	at org.jgroups.protocols.pbcast.NAKACK2.up(NAKACK2.java:536)
	at org.jgroups.protocols.BARRIER.up(BARRIER.java:126)
	at org.jgroups.protocols.VERIFY_SUSPECT.up(VERIFY_SUSPECT.java:143)
	at org.jgroups.protocols.FD_ALL.up(FD_ALL.java:177)
	at org.jgroups.protocols.FD_SOCK.up(FD_SOCK.java:288)
	at org.jgroups.protocols.MERGE2.up(MERGE2.java:205)
	at org.jgroups.protocols.Discovery.up(Discovery.java:359)
	at org.jgroups.protocols.TP.passMessageUp(TP.java:1211)
	at org.jgroups.protocols.TP$IncomingPacket.handleMyMessage(TP.java:1775)
	at org.jgroups.protocols.TP$IncomingPacket.run(TP.java:1743)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:680)