Description Patric Rufflar 2011-05-10 09:23:50 EDT

Build Identifier: 2.2.0

In EL 2.2 I am unable to configure EL to use external connection pooling with exclusive isolated client sessions.

Within Eclipselink 2.1 I do the following to archieve this:

          connectionPolicy.setPoolName(null);
          connectionPolicy.setExclusiveMode(ExclusiveMode.Always);
          emProperties.put(EntityManagerProperties.CONNECTION_POLICY,
              connectionPolicy);

(emProperties are passed to the EntityManagerFactory, persistence.xml contains 
   <property name="eclipselink.jdbc.exclusive-connection.mode"
    value="Always"/> of course)

However, in EL 2.2 this seems to be not sufficient anymore because setPoolName() will now be overriden by the default connection policy at some time after entity manager creation. 
(why?)

I tried to use a SessionCustomizer which will change the default connection policy to set the pool name to null - however, this resulted in an NPE:

java.lang.NullPointerException
	at org.eclipse.persistence.internal.sessions.IsolatedClientSession.<init>(IsolatedClientSession.java:40)
	at org.eclipse.persistence.sessions.server.ServerSession.acquireClientSession(ServerSession.java:382)
	at org.eclipse.persistence.internal.jpa.EntityManagerImpl.getActivePersistenceContext(EntityManagerImpl.java:1576)
	at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.begin(EntityTransactionImpl.java:49)
	at org.eclipse.persistence.testing.framework.junit.JUnitTestCase.beginTransaction(JUnitTestCase.java:299)
	at org.eclipse.persistence.testing.tests.jpa.advanced.ExclusiveIsolatedSessionAndBatchWriteTest.testNoOp(ExclusiveIsolatedSessionAndBatchWriteTest.java:53)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at junit.framework.TestCase.runTest(TestCase.java:168)
	at junit.framework.TestCase.runBare(TestCase.java:134)
	at org.eclipse.persistence.testing.framework.junit.JUnitTestCase.runBare(JUnitTestCase.java:503)
	at junit.framework.TestResult$1.protect(TestResult.java:110)
	at junit.framework.TestResult.runProtected(TestResult.java:128)
	at junit.framework.TestResult.run(TestResult.java:113)
	at junit.framework.TestCase.run(TestCase.java:124)
	at junit.framework.TestSuite.runTest(TestSuite.java:243)
	at junit.framework.TestSuite.run(TestSuite.java:238)
	at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

What is the correct way to configure EL 2.2 to use external connection pooling with exclusive isolated client sessions?
Without this, I cannot use EL 2.2 so this is in fact a blocker to me.

BTW: why is the setPoolName(null) a magically switch? Shouldn't it named like setExternalConnectionPooling(true) instead? 

Reproducible: Always