两台Tomcat+apache+mod_jk 集群,session共享没问题,控制台报错

2015-1-26 9:55:17 org.apache.catalina.ha.tcp.ReplicationValve sendReplicationMessage
严重: Unable to perform replication request.
java.lang.NullPointerException
at org.apache.catalina.ha.tcp.ReplicationValve.isRequestWithoutSessionChange(ReplicationValve.java:554)
at org.apache.catalina.ha.tcp.ReplicationValve.sendSessionReplicationMessage(ReplicationValve.java:488)
at org.apache.catalina.ha.tcp.ReplicationValve.sendReplicationMessage(ReplicationValve.java:404)
at org.apache.catalina.ha.tcp.ReplicationValve.invoke(ReplicationValve.java:349)
at org.apache.catalina.ha.session.JvmRouteBinderValve.invoke(JvmRouteBinderValve.java:218)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:380)
at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:294)
at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:183)
at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:169)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:288)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:662)