Hi,
I have an error I am not able to understand on my Glassfish 3.0.1 server. The
behavior is the following. I have a servlet that return a list of entities by
calling a session bean executing a really simple query ("SELECT e FROM
MyEntity e").
From time to time I get the following error message : "Interrupting idle
Thread: http-thread-pool-8080-(2)" directly followed by the following
exception :
Local Exception Stack: Exception [EclipseLink-2001] (Eclipse Persistence
Services - 2.0.1.v20100213-r6600):
org.eclipse.persistence.exceptions.ConcurrencyException Exception
Description: Wait was interrupted. Message: [null] at
org.eclipse.persistence.exceptions.ConcurrencyException.waitWasInterrupted(ConcurrencyException.java:108)
at
org.eclipse.persistence.internal.helper.ConcurrencyManager.acquireReadLock(ConcurrencyManager.java:244)
at
org.eclipse.persistence.internal.identitymaps.CacheKey.acquireReadLock(CacheKey.java:196)
at
org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.cloneAndRegisterObject(UnitOfWorkImpl.java:961)
at
org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.cloneAndRegisterObject(UnitOfWorkImpl.java:896)
at
org.eclipse.persistence.internal.sessions.UnitOfWorkIdentityMapAccessor.getAndCloneCacheKeyFromParent(UnitOfWorkIdentityMapAccessor.java:171)
at
org.eclipse.persistence.internal.sessions.UnitOfWorkIdentityMapAccessor.getFromIdentityMap(UnitOfWorkIdentityMapAccessor.java:110)
at
org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.checkCacheForObject(ExpressionQueryMechanism.java:787)
at
org.eclipse.persistence.queries.ReadObjectQuery.checkEarlyReturnImpl(ReadObjectQuery.java:230)
at
org.eclipse.persistence.queries.ObjectLevelReadQuery.checkEarlyReturn(ObjectLevelReadQuery.java:694)
at
org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:619)
at
org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:958)
at
org.eclipse.persistence.queries.ReadObjectQuery.execute(ReadObjectQuery.java:399)
at
org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1021)
at
org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2857)
at
org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1225)
at
org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1207)
at
org.eclipse.persistence.internal.indirection.NoIndirectionPolicy.valueFromQuery(NoIndirectionPolicy.java:299)
at
org.eclipse.persistence.mappings.ForeignReferenceMapping.valueFromRowInternal(ForeignReferenceMapping.java:1624)
at
org.eclipse.persistence.mappings.OneToOneMapping.valueFromRowInternal(OneToOneMapping.java:1563)
at
org.eclipse.persistence.mappings.ForeignReferenceMapping.valueFromRow(ForeignReferenceMapping.java:1534)
at
org.eclipse.persistence.mappings.ForeignReferenceMapping.buildCloneFromRow(ForeignReferenceMapping.java:195)
at
org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildAttributesIntoWorkingCopyClone(ObjectBuilder.java:1260)
at
org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildWorkingCopyCloneFromRow(ObjectBuilder.java:1381)
at
org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObjectInUnitOfWork(ObjectBuilder.java:547)
at
org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:491)
at
org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:443)
at
org.eclipse.persistence.queries.ObjectLevelReadQuery.buildObject(ObjectLevelReadQuery.java:635)
at
org.eclipse.persistence.queries.ReadAllQuery.registerResultInUnitOfWork(ReadAllQuery.java:838)
at
org.eclipse.persistence.queries.ReadAllQuery.executeObjectLevelReadQuery(ReadAllQuery.java:464)
at
org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:997)
at
org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:675)
at
org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:958)
at
org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:432)
at
org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1021)
at
org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2857)
at
org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1225)
at
org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1207)
at
org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1181)
at
org.eclipse.persistence.internal.jpa.EJBQueryImpl.executeReadQuery(EJBQueryImpl.java:453)
at
org.eclipse.persistence.internal.jpa.EJBQueryImpl.getResultList(EJBQueryImpl.java:681)
at MySessionBean.getList(MySessionBean.java:145) at
sun.reflect.GeneratedMethodAccessor139.invoke(Unknown Source) at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
... at MyServlet.processRequest(MyServlet.java:47) at
MyServlet..doPost(MyServlet.java:78) at
javax.servlet.http.HttpServlet.service(HttpServlet.java:754)
I suspected the database connection pool to be too small and that the session
bean to wait for a database connection but the monitoring tells me that the
database connection was not full. Usually the servlet invocation last a
maximum of 100ms, I have no clue why sometimes it freezes for 15min. Even
when it freezes other clients can still make the same requests without beeing
disturbed.
Could somebody give me a hint to where the problem might come from?
--
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