Incompatibility Error message is too obtuse.
--------------------------------------------

                 Key: CDV-692
                 URL: https://jira.terracotta.org/jira//browse/CDV-692
             Project: Community Development
          Issue Type: Bug
    Affects Versions: 2.5.2
            Reporter: Sreenivasan Iyer
            Assignee: Issue Review Board


On migration from 2.4.8 to 2.5.2 cgallimo on the forum reports 
(http://forums.terracotta.org/forums/posts/list/940.page) that L2 asserts with 
the following exception. 

Probably due to lack of backward compatibility from 2.5.2 to 2.4.8 for the 
data-store in question. This needs to be confirmed and the error message thrown 
should be something meaningful to the end-user.

 2008-04-02 09:35:45,884 INFO - JMX Server started. Available at 
URL[service:jmx:jmxmp://0.0.0.0:9520]
 java.lang.AssertionError: Unknown type : 0
         at com.tc.net.groups.NodeIDSerializer.getImpl(NodeIDSerializer.java:73)
         at 
com.tc.net.groups.NodeIDSerializer.readNodeID(NodeIDSerializer.java:61)
         at 
com.tc.object.tx.ServerTransactionID.createFrom(ServerTransactionID.java:96)
         at 
com.tc.objectserver.persistence.sleepycat.TransactionPersistorImpl.bytes2ServerTxnID(TransactionPersistorImpl.java:86)
         at 
com.tc.objectserver.persistence.sleepycat.TransactionPersistorImpl.loadAllGlobalTransactionDescriptors(TransactionPersistorImpl.java:50)
         at 
com.tc.objectserver.persistence.impl.TransactionStoreImpl.<init>(TransactionStoreImpl.java:42)
         at 
com.tc.objectserver.impl.DistributedObjectServer.start(DistributedObjectServer.java:522)
         at com.tc.server.TCServerImpl.startDSOServer(TCServerImpl.java:309)
         at com.tc.server.TCServerImpl.access$500(TCServerImpl.java:51)
         at 
com.tc.server.TCServerImpl$StartAction.execute(TCServerImpl.java:277)
         at com.tc.lang.StartupHelper.startUp(StartupHelper.java:39)
         at com.tc.server.TCServerImpl.startServer(TCServerImpl.java:302)
         at com.tc.server.TCServerImpl.start(TCServerImpl.java:134)
         at com.tc.server.TCServerMain.main(TCServerMain.java:28)

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