| Toplink to EclipseLink Migration [message #875852] |
Wed, 23 May 2012 12:57  |
 Mike H
Messages: 3
Registered: May 2012 |
Junior Member |
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I am trying to migrate a web app from Toplink 10.1.3 (Toplink's native ORM) to EclipseLink. So far, I have replaced the toplink JAR with eclipselink, and have ran the renaming script.
Most of the db activity works, except for modifying or access existing db rows through the Unit of Work.
Every time UnitOfWork.registerObject(toplinkObject) is called, the code executes a SELECT query for that object many, many times (the query is valid) until a stack overflow occurs.
Stack trace:
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
...
(excess trace removed)
...
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)
Caused by: java.lang.StackOverflowError
at org.eclipse.persistence.sessions.server.ServerSession.executeCall(ServerSession.java:566)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:207)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:193)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.selectOneRow(DatasourceCallQueryMechanism.java:666)
at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectOneRowFromTable(ExpressionQueryMechanism.java:2656)
at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectOneRow(ExpressionQueryMechanism.java:2627)
at org.eclipse.persistence.queries.ReadObjectQuery.executeObjectLevelReadQuery(ReadObjectQuery.java:450)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1081)
at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:844)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1040)
at org.eclipse.persistence.queries.ReadObjectQuery.execute(ReadObjectQuery.java:418)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1128)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2871)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1516)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1498)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1449)
at org.eclipse.persistence.internal.sessions.AbstractSession.checkAndRefreshInvalidObject(AbstractSession.java:1010)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.cloneAndRegisterObject(UnitOfWorkImpl.java:973)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildWorkingCopyCloneNormally(ObjectBuilder.java:731)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObjectInUnitOfWork(ObjectBuilder.java:668)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:601)
This same problem occurs anytime I try to update a db entry from the application. I feel like I am missing something with the toplink - eclipselink migration. Any advice would be appreciated.
Let me know if you need any more information.
[Updated on: Wed, 23 May 2012 13:41] Report message to a moderator |
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| Re: Toplink to EclipseLink Migration [message #875904 is a reply to message #875852] |
Wed, 23 May 2012 14:19  |
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From the stack checkAndRefreshInvalidObject, it seems your object is invalid so is being refreshed.
This was from a change in the default/new feature to refresh invalid objects when registered in a unit of work.
You can disable this refresh on your descriptor's CacheInvalidationPolicy using setShouldRefreshInvalidObjectsOnClone(false).
My guess is you have an expiry time set in your object that is very small, causing the object to still be out of date after executing the refresh query, so it gets into a loop.
You should probably also increase your cache invalidation timeout.
James : Wiki : Book : Blog : Twitter
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