tests hang with org.jpox.autoStartMechanism=None

• Key: JDO-59
• Type: Bug
• Status: Closed
• Resolution: Fixed
• Priority: Major
• Assignee: Michael Watzek
• Reporter: Michelle Caisse
• Component/s: tck2
• Fix Version/s: JDO 2 beta

Description

The following tests hang with org.jpox.autoStartMechanism=None

org.apache.jdo.tck.api.persistencemanager.cache.RefreshAllNoParameterSideEffects
org.apache.jdo.tck.api.persistencemanager.cache.RefreshAllWithArraySideEffects
org.apache.jdo.tck.api.persistencemanager.cache.RefreshAllWithCollectionSideEffects
org.apache.jdo.tck.api.persistencemanager.cache.RefreshSideEffects

They are currently in test/conf/exclude.list .

Comments

[Michael Watzek]

I can reproduce the problem using datastore identity - regardless of the setting org.jpox.autoStartMechanism. I cannot reproduce it using application identity.

However, the problem does not show up always. I could not find a deterministic way of reproducing it. If it shows up, then then the tests hang.

All tests execute 2 concurrent threads. Each thread performs a single transaction making one or more objects persistent. If the pm.makePersistent calls are prevented from executing in parallel then I can not reproduce the problem any more.

[Michael Watzek]

Actually, it is a race condition - in derby. Sometimes the two calls "makePersistentAll" cause derby to throw a SQLException, because the database timed out on a lock request (see below).

When an exception is thrown, the synchronization mechanism in the 4 tests does not work. This makes one of the two threads wait forever. This is the same problem as JIRA JDO-13.

    [java] ERROR 40XL1: A lock could not be obtained within the time requested
    [java] at org.apache.derby.iapi.error.StandardException.newException(StandardException.java)
    [java] at org.apache.derby.impl.services.locks.LockSet.lockObject(LockSet.java)
    [java] at org.apache.derby.impl.services.locks.SinglePool.lockAnObject(SinglePool.java)
    [java] at org.apache.derby.impl.services.locks.SinglePool.lockObject(SinglePool.java)
    [java] at org.apache.derby.impl.store.raw.xact.RowLocking3.lockRecordForWrite(RowLocking3.java)
    [java] at org.apache.derby.impl.store.access.conglomerate.OpenConglomerate.lockPositionForWrite(OpenConglomerat
e.java)
    [java] at org.apache.derby.impl.store.access.conglomerate.GenericConglomerateController.fetch(GenericConglomera
teController.java)
    [java] at org.apache.derby.impl.sql.catalog.DataDictionaryImpl.getSetAutoincrementValue(DataDictionaryImpl.java
)
    [java] at org.apache.derby.impl.sql.execute.InsertResultSet.getSetAutoincrementValue(InsertResultSet.java)
    [java] at org.apache.derby.impl.sql.execute.BaseActivation.getSetAutoincrementValue(BaseActivation.java)
    [java] at org.apache.derby.exe.ac40348015x0104x675cxbca4xffffdab5f0bf0.e0(Unknown Source)
    [java] at org.apache.derby.impl.services.reflect.DirectCall.invoke(ReflectGeneratedClass.java)
    [java] at org.apache.derby.impl.sql.execute.RowResultSet.getNextRowCore(RowResultSet.java)
    [java] at org.apache.derby.impl.sql.execute.NormalizeResultSet.getNextRowCore(NormalizeResultSet.java)
    [java] at org.apache.derby.impl.sql.execute.DMLWriteResultSet.getNextRowCore(DMLWriteResultSet.java)
    [java] at org.apache.derby.impl.sql.execute.InsertResultSet.open(InsertResultSet.java)
    [java] at org.apache.derby.impl.sql.GenericPreparedStatement.execute(GenericPreparedStatement.java)
    [java] at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(EmbedStatement.java)
    [java] at org.apache.derby.impl.jdbc.EmbedPreparedStatement.executeStatement(EmbedPreparedStatement.java)
    [java] at org.apache.derby.impl.jdbc.EmbedPreparedStatement.executeUpdate(EmbedPreparedStatement.java)
    [java] at org.jpox.store.rdbms.request.Request.executeUpdate(Request.java:69)
    [java] at org.jpox.store.rdbms.request.InsertRequest.execute(InsertRequest.java:253)
    [java] at org.jpox.store.rdbms.table.ClassTable.insert(ClassTable.java:1673)
    [java] at org.jpox.store.StoreManager.insert(StoreManager.java:634)
    [java] at org.jpox.state.StateManagerImpl.internalMakePersistent(StateManagerImpl.java:2940)
    [java] at org.jpox.state.StateManagerImpl.makePersistent(StateManagerImpl.java:2913)
    [java] at org.jpox.AbstractPersistenceManager.internalMakePersistent(AbstractPersistenceManager.java:959)
    [java] at org.jpox.AbstractPersistenceManager.makePersistentAll(AbstractPersistenceManager.java:1034)
    [java] at org.apache.jdo.tck.api.persistencemanager.cache.RefreshAllWithArraySideEffects$RefreshArrThreadT1.run(RefreshAllWithArraySideEffects.java:176)
    [java] at java.lang.Thread.run(Thread.java:595)

The same fix as JDO-13.

[Michael Bouschen]

Reopened to set the Fix Version/s field to JDO 2 beta.