Cache synchronization log

Hi,
I am using Toplink's cache synchronization by JMS. Is there a log where I can see the objects being synchronized.
Thanks,
Moin

Moin,
You can get details of the cache coordination activities by enabling debugging. The details of what is being synchronized is not displayed in any log. This would be far too intrusive on performance. You could add this yourself by using a SessionEventListener.postCommitUnitOfWork. In this event the ChangeSet will include all changes that will be synchronized.
Doug

Similar Messages

Error handling for distributed cache synchronization

Hello,
Can somebody explain to me how the error handling works for the distributed cache synchronization ?
Say I have four nodes of a weblogic cluster and 4 different sessions on each one of those nodes.
On Node A an update happens on object B. This update is going to be propogated to all the other nodes B, C, D. But for some reason the connection between node A and node B is lost.
In the following xml
<cache-synchronization-manager>
<clustering-service>...</clustering-service>
<should-remove-connection-on-error>true</should-remove-connection-on-error>
If I set this to true does this mean that the Toplink will stop sending updates from node A to node B ? I presume all of this is transparent. In order to handle any errors I do not have to write any code to capture this kind of error .
Is that correct ?
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.
For RMI, when this is set to true (which is the default) if a communication exception occurs in sending the cache synchronization to a server, that server will be removed and no longer synchronized with. The assumption is that the server has gone down, and when it comes back up it will rejoin the cluster and reconnect to this server and resume synchronization. Since it will have an empty cache when it starts back up, it will not have missed anything.
You do not have to perform any error handling, however if you wish to handle cache synchronization errors you can use a TopLink Session ExceptionHandler. Any cache synchronization errors will be sent to the session's exception handler and allow it to handle the error or be notified of the error. Any errors will also be logged to the TopLink session's log.

Synchronization logs

Are synchronization errors when in cache mode just a way of life. I have never been able to find out what causes them. I see there is a registry entry to suppress them. I thought when I retired Exchange 2003 and went purely to Exchange 2010 they would go
away. My offline address book is working well so I'm at a lost what causes these. Any ideas?
17:12:49 Error synchronizing folder
17:12:49
[8004010F-501-8004010F-0]
17:12:49
The client operation failed.
17:12:49
Microsoft Exchange Information Store
17:12:49
For more information on this failure, click the URL below:
17:12:49
http://www.microsoft.com/support/prodredirect/outlook2000_us.asp?err=8004010f-501-8004010f-0

Hi,
Is the posting the complete Synchronization Log? Is there a Done or Download successful under the log?
In most cases, these errors are logged in the Sync Issues folder when the items no longer exist in the Exchange mailbox. In these cases, the error can be safely ignored. Here is a KB descripted the details about it, please refer to:
Sync Issues folder for Outlook contains warnings such as "Synchronization of some deletions failed"
http://support.microsoft.com/kb/2606009
Regards,
Winnie Liang
TechNet Community Support

JMS Cache Synchronization Manager

Hi all,
I am trying to implement distributed cache synchronization in TopLink using JMS.
On http://download-west.oracle.com/docs/cd/A97688_12/toplink.903/b10064/enterpri.htm#1022254 , there is an example given which has a snippet of the sessions.xml file.
The example snippet shows a tag <naming-service-initial-context-factory> under the <cache-synchronization-manager> tag. But on the DTD given on http://download-west.oracle.com/docs/cd/A97688_12/toplink.903/b10064/a-sessio.htm#634251 , I cant find an element <naming-service-initial-context-factory>. Please let me know which one is wrong - the DTD or the example?
Also, I tried to use JMS for distributed cache synchronization. My JMS Server is running on a seperate VM and I have configured info about it in the sessions.xml file. But TopLink is complaining that it cannot find the top and connection factory. Yet, I am able to look them up from a standalone program.
Does anyone have any experience setting this up? Any examples?
Thanks,
Binil

Hi Doug,
Thanks for the clarifications! :)
I am not able to get the JMS Cache Synchronization work still :( I am new to JMS & Toplink - so I will try to explain what I am doing and please let me know if there is something I am doing wrong.
I have an EJB application which is a Stateless Session bean which has two methods : one to fetch an entity and another to update an entity. Also, I have a weblogic domain in which I have three managed servers - appServerOne, appServerTwo and jmsServer. On appServerOne and appServerTwo I have deployed the above mentioined application. On jmsServer, I have configured my ConnectionFactory and Topic and the JNDI names of those are provided to the EJB application.
With this setup, I run two client programs. I will list the steps below:
1. Client1 fetches an entity whereby it is loaded to the TopLink cache. The DB logs show that a SELECT query is issued to the DB.
2. Client2 fetches the same entity whereby it is loaded to the cache; again a SELECT query is issued.
3. Client1 updates that entity using UOW; the logs dont show a DB UPDATE statement though. But the updates are indeed made to the DB when I check them.
4. Client1 fetches the entity again; the updates are visible and the JDBC logs show that a trip to the DB is not done.
5. After waiting for sometime Client1 fetches the same entity again and I get the stale data! :(
I have enabled logging, so I am hoping that TopLink will log a message when a JMS notification is posted. Also, I have made the cache synchronization synchronous, so that the transaction shouldnt commit before the notification being send.
I tried making the stateless session bean stateful and it still didnt work. Is there anything I need to do.
Cheerio,
Binil

[eSSO] Enable Synchronization Log

Hello people!
I need synchronization log so I see when error ocurrent in the establish connection with eSSO Logon Manager.
I found IBM Troubleshooting TAMESSO documentation a Synchonization Log but is not funtionally with Oracle eSSO LM.
HELP ME!
thanks!

Hi,
The Synchronization log errors will commonly occur when using cached Exchange mode. The errors were generated for various reasons like when clients try to Synchronize copies of emails from cached server folders, Network connectivity issues, multiples clients
access same email. The exchange sync will work fine even though the error logs generated. There are various ways in which this can be limited.
The one and widely used method is to keep these error messages out of the "Unread Mail" folder by creating rule in Outlook and other way is to create a new DWORD value in the registry.
Follow the below steps to create a new DWORD value.
- Open REGEDIT
- Go to HKEY_CURRENT_USER > Software > Microsoft > Office > 14.0 > Outlook > Options
- Now create a new DWORD value and name it as "EnableConflictLogging" and set the value as 0 (zero).
The values available are:
0 (zero): Never save modification resolution logs
1: always save modification resolution logs
2: only save critical modification resolution logs
Hope this helps.
Regards,
Santhosh.
www.jijitechnologies.com

Cache Synchronization with JMS and a Message Driven Bean (MDB)

If I understand correctly, Toplink ueses the following configuration info to find the target to publish its session messages to a JMS server (having its URL as below) which provides the JNDI service that Toplink needs to look up the topic:
<cache-synchronization-manager>
<clustering-service> oracle.toplink.remote.jms.mdb.JMSPublishingOnlyClusteringService
</clustering-service>
<should-remove-connection-on-error>false</should-remove-connection-on-error>


<jms-topic-connection-factory-name> jms/TopLinkTopicConectionFactory
</jms-topic-connection-factory-name>
<jms-topic-name>jms/TopLinkCacheSynchTopic</jms-topic-name>


<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>
The MDB also uses the same JNDI service provided by the JMS server to listen to the topic which is named in the ejb-jar.xml file:
<enterprise-beans>
<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>
<message-driven-destination> <destination-type>javax.jms.Topic</destination-type>
</message-driven-destination>
<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>
</env-entry>
<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>
</resource-ref>
<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>
</message-driven></enterprise-beans>
To do this, the EJB container that hosts the above MDB needs to be configured to know where the JMS server is by using the above URL same as in the Toplink sessions.xml file.
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.
Note that setting an environment entry as mentioned above simply allows for the session name to be declared dynamically. The call to âmyEnv.lookup(âtl_session_name_for_mdbâ)â simply asks the beanâs environment for the <env-entry-value> that matches the <env-entry-name>. That string is then used in SessionManager (no different than a hard coded value would be) to identify the session in sessions.xml that is to be loaded.
I hope this makes sense.

More Control of Cache Synchronization in a Cluster?

If I understand correctly, the cache synchronization manager, by default, sends out a changeSet message to the network for any UOW write commit. Since I have a control on certain objects not using Toplinkâs cache, I actually do not need the cache synchronization manger to broadcast any update on these objects. In other words, I do not want the cache synchronization manger to send out the changeSet message to the network if I only update those objects that are configured to always read from the database. In this way, I may be able to avoid some unnecessary changeSet message propagations.
My question is that whether I have a way, either in sessions.xml or in Java API, to tell the cache synchronization manger not to send out the changeSet message for a given specific UOW write commit (although I still need the data update to be committed to the database).

Many thanks for the reply and glad to see something better is on the way again!
If I choose to set the cache synchronization manager to null, do the UOW write for a given class which is always refreshed from the database, and then reset the cache synchronization manger back to the previous instance, do I need to do the following afterwards:
          // must login/re-login to initialize cache synchronization
          if (session.isConnected()) {
               session.logout();
          session.login();
to ensure the manager be reset properly?
Since the propagation of the changeSet message is triggered by the UOW, can I have more control at the UOW level to turn on/off the cache synchronization manager?
If I understand correctly, in Toplink 10.1.3, I can configure the cache synchronization manger globally at the session level, and also have the option in the same application to set a given number of classes not be cache synchronized in a cluster at the descriptor level to overrule the session global settings. I should not have to choose one over the other. Once these are done in configurations, what is the reason that I still have to choose either to send the changeSet or to invalidate the message?

Exchange 2010 / Outlook 2010 "client error in synchronization log"

Exchange
2010:
Error
in Synchronization Log
19:28:32 Error synchronizing
folder
19:28:32                               [8004010F-501-8004010F-0]
19:28:32                               The
client operation failed.
19:28:32                               Microsoft
Exchange Information Store
19:28:32                               For
more information on this failure, click the URL below:
19:28:32                               http://www.microsoft.com/support/prodredirect/outlook2000_us.asp?err=8004010f-501-8004010f-0
Please
assist with this error. Is it serious? The URL provided does not offer nor reflect any worthwhile information. Thanks.

The error means that the client hasn’t located the resource it’s looking for
Does the error appear on all outlook clients?
Do you use organizational forms library? (KB
933358)
The error can be caused by incorrect permission on the “EFORMS REGISTRY”, so please run the cmdlet below to check the permission on
the Default group, the permission should be “Reviewer”
Get-PublicFolderClientPermission “\NON_IPM_SUBTREE\EFORMS REGISTRY”
Per my research, you can avoid this error by removing all the subfolders in the “EFORMS REGISTRY” folder, if you don’t use organizational
forms library. But, please use the Get-PublicFolderStatistics cmdlet to verify that no items under the “EFORMS REGISTRY” folder before. And, if the error still appears, please remove the OST file and then recreate the mail profile
Please run ExBPA against the exchange servers for health/permission check
Notes: If forms library replicas are added to Exchange 2010 servers, 80004005-501-4B9-560
will appear in the sync message, yet it can be safely ignored
Resources:
“The Organizational Forms Library has been deleted and re-created after the .ost file has synchronized the library” section
in You receive an error message when you try to synchronize your offline folder file if the Organizational Forms Library on your Exchange computer has
been re-created or cannot be located
James Luo
TechNet Subscriber Support (http://technet.microsoft.com/en-us/subscriptions/ms788697.aspx)
If you have any feedback on our support, please contact [email protected]

Toplink in Cluster without Cache Synchronization

Hello,
Iâm trying to setup my J2EE app that uses Toplink for its persistence in a 9iAS cluster. For the first release Iâm not planning to use Toplink Cache synchronization but planning to deploy the app in 9iAS cluster of nodes say A and B. By default all the requests goes to one app server (say A) in the cluster. When the app in node A goes down app in node B starts and accepts all the requests transparently. For this scenario:
1. Do I need to use any Toplink feature/API?
2. What design considerations I need to consider for my app so that I can achieve my short-term goal and the long-term goal of implementing Cache synchronization easily?
Any references/pointers would help me.
Thanks
-Mani

TopLink Cache Coordination (Synchronization) can be enabled at any point during your development. And is not required on a system running in a cluster. No special TopLink API's are required when running in the cluster.
There should be no design decisions made now that would affect the use of Cache Coordination (Synchronization) in the future.
--Gordon

10.1.3 JMS Cache Synchronization on OC4J

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.
at oracle.toplink.exceptions.CommunicationException.errorSendingConnectionService(CommunicationException.java:40)
at oracle.toplink.remote.CacheSynchronizationManager.addRemoteConnection(CacheSynchronizationManager.java:175)
at oracle.toplink.remote.jms.JMSClusteringService.retreiveRemoteSessions(JMSClusteringService.java:198)
at oracle.toplink.remote.jms.JMSClusteringService.run(JMSClusteringService.java:175)
Caused by: javax.jms.JMSException: TopicSubscriber[Oc4jJMS.Consumer.arkansas.6e2ec2b0:1117159d1ca:-7fff.65,Topic[ToplinkCacheSync],null,null,false]: cannot invoke method "setMessageListener" within the J2EE container.
at com.evermind.server.jms.JMSUtils.make(JMSUtils.java:1034)
at com.evermind.server.jms.JMSUtils.toJMSException(JMSUtils.java:1114)
at com.evermind.server.jms.JMSUtils.toJMSException(JMSUtils.java:1085)
at com.evermind.server.jms.JMSUtils.assertNotContainer(JMSUtils.java:1500)
at com.evermind.server.jms.EvermindMessageConsumer.setMessageListener(EvermindMessageConsumer.java:217)
at oracle.toplink.remote.jms.JMSClusteringService.connectBackToRemote(JMSClusteringService.java:53)
at oracle.toplink.remote.CacheSynchronizationManager.addRemoteConnection(CacheSynchronizationManager.java:168)
... 2 more
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

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.

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.

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:
          RMIRemoteSessionController controller = (RMIRemoteSessionController)Naming.lookup(registryName);
          RemoteConnection connection = new RMIConnection(controller);
          CacheSynchronizationManager syncMgr = new CacheSynchronizationManager();
          serverSession.setCacheSynchronizationManager(syncMgr);
          serverSession.getCacheSynchronizationManager().addRemoteConnection(connection);
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?

Distributed Cache synchronization with JMS

Hello,
The documentation on Cache Synchronization using JMS lists steps to setting up JMS in the JMSClusteringService but does not list steps as to how to connect or setup connections to the various different servers inorder to synchronize between them. It lists steps for connecting to servers when using RMI but not JMS. Appreciate any additional documentation on doing this in JMS. Many thanks

JMS, by its nature, provides the connections between the different 'servers'. If all servers connect to the same JMS service then there are no additional actions required to have the 'servers' synchronize.
--Gordon

Cache Synchronization Exception Handling

I am setting up cache synchronization on WebLogic using JMS. I am looking into writing an exception handler to handle cache synchronization exceptions. The following statement in the documentation caught my attention:
As mentioned above, the TopLink cache does not begin the merge or update process until the database transaction has already been committed. This is quite beneficial in that it avoids letting uncommitted data into the shared cache, but should be recognized where transactional synchronization is considered. In cases where a merge may have failed there is no way to roll back the changes made to the database (although it is questionable whether this would be a good idea in any case). As a consequence, failures during remote merging can leave the cache in an inconsistent state. This makes it important to handle any errors that occur by performing cache normalization actions, such as resetting the cache, or even the server.
Suppose we have two app server instances, A and B. Instance A commits a change and sends the update notification to instance B. The merge fails on instance B with an optimistic lock exception.
- I assume that a CacheSynchronizationException will be thrown. Will it be thrown on instance A, B, or both?
- At this point which cache is inconsistent; A, B, or both?
- The documentation suggests resetting the cache, but this seems a rather severe way of dealing with the problem. Is it feasible / effective to just refresh the objects in the change set of the CacheSynchronizationException?
This is a simple exception handler. On receiving a CacheSynchronizationException it resets the cache and re-throws the exception.
class ToplinkExceptionHandler implements ExceptionHandler{
     public Object handleException(RuntimeException exception) throws DatabaseException{
          if(exception instanceof CacheSynchronizationException){){
               myServerSession.initializeAllIdentityMaps();
               throw exception;
          }else{
               throw exception;
- Is this approach effective?
- Once the cache is reset should the exception be re-thrown or should I consider it handled and swallow it? If I do swallow it what should the method return?
Any advice would be appreciated.

I had to fix a few errors (in our code) before getting it working. Since I have multiple sessions, I had to specify different multicast ports (actually I used a different multicast address itself) for each of the sessions. I was not setting the announcement delay on one of the sesssions and that was why it was announcing immediately upon coming up. Also I had to explicitly set asynchronous to false because it is true by default.
BTW, we are not using CMP (entity beans) rather Java Objects. Our deployment has two Apache/Tomcat machines and two WebLogic machines. The WebLogic servers are in a round-robin cluster. The cache synchronization seems to be working fine for this configuration.
Thanks.
Anand R

Where do I find the synchronization log?

Hello. I'm new to the forum (and Blackberry), and I've learned a lot the last few days browsing the posts; solved a few issues thanks to the many posters. So far, I haven't come across the solution to one problem. When I synch my Storm, I get a message: "There was a total of 2 reconrd(s) skipped during the synchronization as summarized below: Address Book: Device -0, Microsoft Outlook -2. Please check the synchronization log for more details."
Number 1. What would cause the skipped records?
Number 2. Where is the synchronization log? Using some information I found elsewhere, I look in the Program Files/Research In Motion/Blackberry folder, where there is supposed to be a PIN folder that contains the synch. log folder--but the PIN folder does not exist.  I tried creating the PIN folder and re-synched, but that didn't work. Is the log located somewhere else for the Storm?
It seems logical if you need to view the log, RIM should provide a link to it along with the message, so you could jump right to it. Palm has always done that, and it can't be very difficult to add this convenience for users.

Duh! I guess I need a remedial reading class! You were correct (of course!). I found the log just where you said it was. But I'm not sure how this log will help me to resolved the "skipped entry" issue. I've posted the text of the log below:
On 1/12/2009 9:03 AM
Synchronize Device MemoPad with Microsoft Outlook Notes
First System:             Device
Second System:            Microsoft Outlook
Second System File Name: MemoPad
Conflict Resolution:      Notify
Input From First System:
Total Inputs From First System: 0
Input From Second System:
   READ "<Unspecified>"
   READ "<Unspecified>"
   READ "<Unspecified>"
   READ "<Unspecified>"
   READ "<Unspecified>"
   READ "<Unspecified>"
   READ "<Unspecified>"
   READ "<Unspecified>"
   READ "<Unspecified>"
   READ "<Unspecified>"
   READ "<Unspecified>"
   READ "<Unspecified>"
   READ "<Unspecified>"
   READ "<Unspecified>"
   READ "<Unspecified>"
Total Inputs From Second System: 15
Summary of Data Analysis:
   12/30/08--LOOK FOR BOOKS        - Unchanged on Both Systems
   HOTEL CARDS                     - Unchanged on Both Systems
   Downey Savings                  - Unchanged on Both Systems
   City National Bank              - Unchanged on Both Systems
   Social Security Numbers         - Unchanged on Both Systems
   ROBERTA'S HEALTH INSURANCE IN   - Unchanged on Both Systems
   Blackberry software (handango   - Unchanged on Both Systems
   3/25/08, DateBk6 Registration   - Unchanged on Both Systems
   GIFTS FROM ROBERTA              - Unchanged on Both Systems
   GIFTS FOR ROBERTA               - Unchanged on Both Systems
   7/26/07, DbFixIt Registration   - Unchanged on Both Systems
   1/29/07, DateBk6 Registration   - Unchanged on Both Systems
   LAKERS SCHEDULE-2008-2009       - Unchanged on Both Systems
   Encino/Tarzana Dictation        - Unchanged on Both Systems
   REGISTRATION CODE FOR CUCUSOF   - Unchanged on Both Systems
Records Added or Changed - Conflicting: 0
Records Added - Not Conflicting:        0
Records Changed - Not Conflicting:      0
Records Deleted:                        0
Records Unchanged:                      15
Updates To First System:
Total Updates To First System: 0
Updates To Second System:
Total Updates To Second System: 0
Field mapping used for translation:
   Device                            Microsoft Outlook
   Note - Title -------------------- Subject
   Note - Body --------------------- Body
   Categories ---------------------- Categories
Translation successful.
Thanks again!

Cache synchronization log

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