Environment:
Apache Tomcat 8.5.11
OpenJDK Runtime Environment (build 1.8.0_121-b13)
Hi,
I am trying to run a two node Tomcat cluster (server1 & server2) with
an Apache load balancer.
I require both Session and Context replication.
I've had no trouble getting Session replication to work using
SimpleTcpCluster, however I've been unable to get the Context
replication to work.
I have the following config in META-INF/context.xml:
<Context className="org.apache.catalina.ha.context.ReplicatedContext"/>
and in WEB-INF/web.xml:
<distributable/>
When I place an object in the server1 ServletContext I see the
following error on server2:
02-Mar-2017 11:31:28.088 SEVERE
[Tribes-Task-Receiver[Catalina-Channel]-3]
org.apache.catalina.tribes.tipis.AbstractReplicatedMap.messageReceived
Unable to deserialize MapMessage.
java.lang.ClassNotFoundException: com.pharmhos.merlin.jaas.AdUser
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:677)
at
org.apache.catalina.tribes.io.ReplicationStream.resolveClass(ReplicationStream.java:79)
at
java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1819)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1713)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1986)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:422)
at
org.apache.catalina.tribes.io.XByteBuffer.deserialize(XByteBuffer.java:558)
at
org.apache.catalina.tribes.tipis.AbstractReplicatedMap$MapMessage.value(AbstractReplicatedMap.java:1504)
at
org.apache.catalina.tribes.tipis.AbstractReplicatedMap$MapMessage.deserialize(AbstractReplicatedMap.java:1462)
at
org.apache.catalina.tribes.tipis.AbstractReplicatedMap.messageReceived(AbstractReplicatedMap.java:649)
at
org.apache.catalina.tribes.group.GroupChannel.messageReceived(GroupChannel.java:300)
at
org.apache.catalina.tribes.group.ChannelInterceptorBase.messageReceived(ChannelInterceptorBase.java:83)
at
org.apache.catalina.tribes.group.ChannelInterceptorBase.messageReceived(ChannelInterceptorBase.java:83)
at
org.apache.catalina.tribes.group.interceptors.TcpFailureDetector.messageReceived(TcpFailureDetector.java:116)
at
org.apache.catalina.tribes.group.ChannelInterceptorBase.messageReceived(ChannelInterceptorBase.java:83)
at
org.apache.catalina.tribes.group.ChannelCoordinator.messageReceived(ChannelCoordinator.java:276)
at
org.apache.catalina.tribes.transport.ReceiverBase.messageDataReceived(ReceiverBase.java:244)
at
org.apache.catalina.tribes.transport.nio.NioReplicationTask.drainChannel(NioReplicationTask.java:213)
at
org.apache.catalina.tribes.transport.nio.NioReplicationTask.run(NioReplicationTask.java:101)
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)
It appears that my AdUser object is being serialized on server1 but is
not being deserialized on server2.
The "AdUser" class exists within the web application under
WEB-INF/classes but it looks like the
org.apache.catalina.tribes.io.ReplicationStream is not using the right
class loader for the web app.
I don't know if this is a configuration error, tomcat bug, or
something else. Any suggestions on how to diagnose or resolve this
issue will be gratefully received.
Andrew gillett
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