[ https://issues.apache.org/jira/browse/OPENJPA-1119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12721324#action_12721324 ] 

Michael Dick commented on OPENJPA-1119:
---------------------------------------

It's not actually an OOM, it's a case of running out of perm gen space. I've only see it happen with Linux + Sun JDK6.. Maybe I need to upgrade my JDK (and only with the patch applied). 

$java -version
java version "1.6.0_13"
Java(TM) SE Runtime Environment (build 1.6.0_13-b03)
Java HotSpot(TM) 64-Bit Server VM (build 11.3-b02, mixed mode)


> NPE in InstrumentationFactory
> -----------------------------
>
>                 Key: OPENJPA-1119
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1119
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: kernel
>    Affects Versions: 2.0.0
>            Reporter: Rick Curtis
>            Assignee: Rick Curtis
>             Fix For: 2.0.0
>
>         Attachments: OPENJPA-1119.PATCH
>
>   Original Estimate: 0h
>  Remaining Estimate: 0h
>
> As reported in the dev forum [1] InstrumentationFactory.class.getProtectionDomain().getCodeSource() returns null, causing a NPE.
> Caused by: java.lang.NullPointerException
>         at org.apache.openjpa.enhance.InstrumentationFactory.getAgentJar(InstrumentationFactory.java:204)
>         at org.apache.openjpa.enhance.InstrumentationFactory.access$200(InstrumentationFactory.java:47)
>         at org.apache.openjpa.enhance.InstrumentationFactory$1.run(InstrumentationFactory.java:99)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at org.apache.openjpa.enhance.InstrumentationFactory.getInstrumentation(InstrumentationFactory.java:87)
>         at org.apache.openjpa.enhance.PCEnhancerAgent.loadDynamicAgent(PCEnhancerAgent.java:95)
>         at org.apache.openjpa.persistence.PersistenceProviderImpl.loadAgent(PersistenceProviderImpl.java:243)
>         at org.apache.openjpa.persistence.PersistenceProviderImpl.createEntityManagerFactory(PersistenceProviderImpl.java:91)
>         at org.apache.openjpa.persistence.PersistenceProviderImpl.createEntityManagerFactory(PersistenceProviderImpl.java:119)
>         at org.apache.openjpa.persistence.PersistenceProviderImpl.createEntityManagerFactory(PersistenceProviderImpl.java:55)
>         at javax.persistence.Persistence.createFactory(Persistence.java:172)
>         ... 51 more
> [1] http://n2.nabble.com/Error-loading-agent-with-Openjpa2-td3024299.html

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