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https://issues.apache.org/jira/browse/OPENJPA-1976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13018738#comment-13018738
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Chuong Pham commented on OPENJPA-1976:
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The error "java.lang.IllegalStateException: WEB9031" relates to a problem with
the OpenJPA enhancer (See Issue 1410 at
https://issues.apache.org/jira/browse/OPENJPA-1410%3E). When you execute Sun's
JDK the OpenJPA's dynamic enhancer starts by default. This action, in turn,
stuffs up Glassfish's classloader class - hence, the "WEB9031" error.
For those who experience this same issue, a simple workaround is to do the
enhancement at build time - which I did in ANT with
`org.apache.openjpa.ant.PCEnhancerTask` - and add this property to your
"persistence.xml" to shut off the dynamic enhancer: "<property
name="openjpa.DynamicEnhancementAgent" value="false"/>".
Also, it wouldn't hurt to throw this in your "persistence.xml" as well
"<property name="openjpa.RuntimeUnenhancedClasses" value="unsupported" />".
> EntityManager.find method cause errors
> --------------------------------------
>
> Key: OPENJPA-1976
> URL: https://issues.apache.org/jira/browse/OPENJPA-1976
> Project: OpenJPA
> Issue Type: Bug
> Components: jpa
> Affects Versions: 2.1.0
> Environment: Glassfish 3.1, JSF 2.1.0, Apache OpenJPA 2.1.0, MySQL
> 5.5.10, Eclipse Helios IDE, Windows XP Service Pack 3
> Reporter: Chuong Pham
> Assignee: Rick Curtis
> Labels: features, test
> Attachments: ENTITY.txt, SCENARIO 1 STACKTRACE.txt, SCENARIO 2
> STACKTRACE.txt
>
>
> Scenario 1: The EntityManager.find method is unable to pass a String value as
> its second parameter and caused the following error:
> <openjpa-2.1.0-r422266:1071316 nonfatal user error>
> org.apache.openjpa.persistence.ArgumentException: The given value
> "214736890D96ED598E1D3050F1F025A7" cannot be converted into an identity for
> "com.ckd.model.BookModel". The value is the wrong type (java.lang.String).
> java.lang.NumberFormatException: For input string:
> "214736890D96ED598E1D3050F1F025A7"
> It seems from the errors above that the EntityManager.find method will only
> accept a numeric value as its second parameter.
> Scenario 2: The EntityManager.find method is unable to pass a Long value and
> caused the following error:
> <openjpa-2.1.0-r422266:1071316 fatal user error>
> org.apache.openjpa.persistence.ArgumentException: An error occurred while
> processing registered class "class com.ckd.model.BookModel".
> java.lang.IllegalStateException: WEB9031: WebappClassLoader unable to load
> resource [org.apache.openjpa.util.LongId], because it has not yet been
> started, or was already stopped
> The columns used for testing are from a MySQL 5.x table and have the
> following definitions:
> ID SMALLINT(5)
> HASHID VARCHAR(32)
> The value of HASHID is used to test Scenario 1; while the value of ID is used
> to test Scenario 2.
> Conclusion: The above scenarios show that the EntityManager.find method is
> currently unusable/buggy and needs to be investigated for the next release.
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