https://bz.apache.org/bugzilla/show_bug.cgi?id=60806
Bug ID: 60806
Summary: Problem with ServletContext replication
Product: Tomcat 8
Version: 8.5.11
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Cluster
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ----
Environment:
Apache Tomcat 8.5.11
OpenJDK Runtime Environment (build 1.8.0_121-b13)
Centos 7.3 (64 bit)
I have a two node Tomcat cluster (server1 & server2) with an Apache load
balancer.
Context replication is enabled with:
<Context className="org.apache.catalina.ha.context.ReplicatedContext"/>
in META-INF/context.xml, and
<distributable/>
in WEB-INF/web.xml.
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
finding the right class loader for the web app.
According to <[email protected]>:
> This seems to ReplicatedContext's bug.
> In the current code, the class loader is passed to ReplicationMap as Null.
> It is necessary to call super.startInternal() before initializing the
> ReplicationMap.
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