10.1.3 cache synchronization using custom RMI code

I am trying to port our custom RMI synchronization code (overriding RMIClusteringService) from 9.0.4 to 10.1.3.
It works by sending an update message to the remote cache whenever an object gets changed on the local cache as follows:
2006.05.15 11:28:38.117--ServerSession(1102039280)--Thread(Thread[RMI TCP Connection(926)-19.39.48.136,5,RMI Runtime])--Received updates from Remote Server
This message then results in a trip to the DB to get the object updates.
Per 10g documentatation, the changed notification should contain the changed attributes (change set) and this should not result in a DB trip for the remote cache. I am not seeing this behavior.
This is probably because I was using the old (9.0.4) sessions file with our custom cache synchronization manager, which overrides toplink cache sync settings, as shown below:
<cache-synchronization-manager>
<clustering-service>
oracle.toplink.remote.rmi.polling.RMIPollingClusteringService
</clustering-service>
<naming-service-url>localhost:1099</naming-service-url>
</cache-synchronization-manager>
<event-listener-class>
oracle.toplink.remote.rmi.polling.RMIPollingClusteringServiceSessionEventAdaptor</event-listener-class>
With 10.1.3 RMIClusteringService is deprecated and replaced by RMITransportManager. A whole bunch of other classes has been added. Has anyone migrated or written RMI custom cache sync code to use RMITransportManager? If so, can they share their experiences and/or send their code samples? Any other thoughts will be appreciated too.
thanks,
Prabodh.

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Aswin.

This "should-remove-connection-on-error" option mainly applies to RMI or RMI_IIOP cache synchronization. If you use JMS for cache synchronization, then connectivity and error handling is provided by the JMS service.
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<jms-topic-connection-factory-name> jms/TopLinkTopicConectionFactory
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<naming-service-url>ormi://localhost:23791</naming-service-url>
<naming-service-initial-context-factory> com.evermind.server.rmi.RMIInitialContextFactory </naming-service-initial-context-factory></cache-synchronization-manager>
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<message-driven>
<display-name>TopLink clustering MDB</display-name>
<ejb-name>TopLinkClusteringMDB</ejb-name>
<ejb-class>com.mycompany.mdb.ClusteringMDB</ejb-class>
<transaction-type>Container</transaction-type>
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<env-entry>
<description>TopLink session name</description>
<env-entry-name>tl_session_name_for_mdb</env-entry-name>
<env-entry-type>java.lang.String</env-entry-type>
<env-entry-value>Employee_Session</env-entry-value>
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<resource-ref> <description>description</description>
<res-ref-name>jms/TopLinkTopicConectionFactory</res-ref-name>
<res-type>javax.jms.TopicConnectionFactory</res-type>
<res-auth>Application</res-auth>
<res-sharing-scope>Shareable</res-sharing-scope>
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<resource-env-ref>
<resource-env-ref-name> jms/TopLinkCacheSynchTopic</resource-env-ref-name>
<resource-env-ref-type>javax.jms.Topic</resource-env-ref-type> </resource-env-ref>
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I am not clear that who provides the JNDI service for the Toplink session name lookup used by the MDB:
// Obtain the Session name configured in the environment variable
String sessionName = (String) myEnv.lookup(TOPLINK_SESSION_NAME);
session = SessionManager.getManager().getSession(sessionName);
so that the MDB can find the currently running Toplink session and communicate with it.
Can anybody help answer my above question and correct my understandings?
Many thanks!

Although TopLink is running in the application serverâs VM, the only notable integration points with the server are for JTA and user-defined data sources. All of the work performed to get a session via SessionManager occurs solely within TopLink. When the call is made to retrieve a session, you arenât getting the âactiveâ session identified by âEmployee_Sessionâ that is registered with the application server, rather a new session is created using the definition that exists for âEmployee_Sessionâ in sessions.xml.
When the call âsession = SessionManager.getManager().getSession(âEmployee_Sessionâ)â is made, the SessionManager simply looks for sessions.xml at the root level of its deployed jars or classpath, then looks for the âEmployee_Sessionâ tag within sessions.xml. If a session exists in the file with that name then a TopLink session object is created and returned.
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I hope this makes sense.

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Hi,
We're using stand-alone OC4j 10.1.3.0 along with TopLink 10.1.3.0 (packaged with OC4j). In enabling JMS cache synchronization, I get the following error message:
Exception [TOPLINK-12000] (Oracle TopLink - 10g Release 3 (10.1.3.0.0) (Build 060118)): oracle.toplink.exceptions.CommunicationException
Exception Description: Error Sending connection service to jms/Topic/ToplinkCacheSync.
Internal Exception: javax.jms.JMSException: TopicSubscriber[Oc4jJMS.Consumer.arkansas.6e2ec2b0:1117159d1ca:-7fff.65,Topic[ToplinkCacheSync],null,null,false]: cannot invoke method "setMessageListener" within the J2EE container.
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at com.evermind.server.jms.JMSUtils.toJMSException(JMSUtils.java:1085)
at com.evermind.server.jms.JMSUtils.assertNotContainer(JMSUtils.java:1500)
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at oracle.toplink.remote.CacheSynchronizationManager.addRemoteConnection(CacheSynchronizationManager.java:168)
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It is, therefore, my assumption that Toplink is using JMS 1.0.2b while OC4J is using JMS 1.1. Who can:
1) Verify or debunk my assumption?
2) Point me to a work-around?
Perhaps my config is incorrect? Here's a sessions.xml snippet, in case it helps:
<cache-synchronization-manager>
<clustering-service xsi:type="jms-clustering">
<naming-service-url>ormi://localhost:23791/ems</naming-service-url>
<jndi-user-name>oc4jadmin</jndi-user-name>
<jndi-password>oc4j</jndi-password>
<naming-service-initial-context-factory-name>com.evermind.server.rmi.RMIInitialContextFactory</naming-service-initial-context-factory-name>
<jms-topic-connection-factory-name>jms/Topic/ToplinkCacheSyncConnectionFactory</jms-topic-connection-factory-name>
<jms-topic-name>jms/Topic/ToplinkCacheSync</jms-topic-name>
</clustering-service>
<remove-connection-on-error>false</remove-connection-on-error>
</cache-synchronization-manager>
Many thanks in advance,
--Todd

Thank you very much for your contribution! Yes, indeed, that was my main issue. A sessions.xml section that looks like the following (instead of the <cache-synchronization-manager> section above) does fix the problem:
<remote-command>
<commands>
<cache-sync>true</cache-sync>
</commands>
<transport xsi:type="jms-topic-transport">
<topic-host-url>ormi://localhost:23791/ems</topic-host-url>
<topic-connection-factory-name>jms/Topic/ToplinkCacheSyncConnectionFactory</topic-connection-factory-name>
<topic-name>jms/Topic/ToplinkCacheSync</topic-name>
<jndi-naming-service>
<user-name>oc4jadmin</user-name>
<password>oc4j</password>
<initial-context-factory-name>com.evermind.server.rmi.RMIInitialContextFactory</initial-context-factory-name>
</jndi-naming-service>
</transport>
</remote-command>
Thanks again,
--Todd

Distributed Cache Synchronization

I'm trying to implement distributed cache synchronization via RMI but I find the documentation to be very limited on how to do this. I'm doing exactly what the documentation says and I end up with a CommunicationException when trying to connect to the pre-existing session. The toplink docs are not very descriptive about the cause or meaning of CommunicationException.
Also, this is in toplink 3.6 which I know is old, but comparing it with the new oracle versions the requirements for DCS are almost identical.
Here is the code I'm trying to use:
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          serverSession.setCacheSynchronizationManager(syncMgr);
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Here is the stack trace I'm seeing:
18:53:01,146 DEBUG OEDataEntry - OEDataEntry - - EXCEPTION [TOPLINK-0] (3.6.2 JDK1.2): TOPLink.Public.Remote.CommunicationException
18:53:01,146 DEBUG OEDataEntry - OEDataEntry - - EXCEPTION DESCRIPTION: Error Sending connection service to
18:53:01,156 DEBUG OEDataEntry - OEDataEntry - - INTERNAL EXCEPTION: java.lang.ClassCastException
18:53:01,166 DEBUG OEDataEntry - OEDataEntry - -      at TOPLink.Public.Remote.CacheSynchronizationManager.addRemoteConnectionForSynchronization(CacheSynchronizationManager.java:84)
18:53:01,166 DEBUG OEDataEntry - OEDataEntry - -      at TOPLink.Public.Remote.CacheSynchronizationManager.addRemoteConnection(CacheSynchronizationManager.java:68)

Also, if someone could provide me with a complete example of how to implement distributed cache synchronization via RMI that would be helpful too, the docs are very sparse on this.
Basically what I'm trying to do is this: I have a web application that uses toplink to connect to a database. I have a separate application that also uses toplink to connecto the database that runs outside the application. The external app can update tables that the web application uses, I would like the web application to have it's cache updated when the external app changes something in those tables. It is my understanding that this is what distributed cache synchronization is for. How do I use it?

10.1.3 cache synchronization using custom RMI code

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