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From "Jeremy Bauer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (OPENJPA-1410) Class linkage exception when creating an EMF with OpenJPA M3
Date Tue, 09 Mar 2010 21:28:27 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-1410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12843302#action_12843302
] 

Jeremy Bauer commented on OPENJPA-1410:
---------------------------------------

I was able to reproduce this problem on Tomcat 6.0.20, but not Glassfish 3.    I don't know
if OpenJPA 2.0 can be made to work with Glassfish 2.x since that level of server is Java EE
5 and OpenJPA 2.0 is uses the JPA 2.0 API, which is Java EE 6 technology.  Glassfish provides
its own JPA 1.0 persistence library and it may collide with the JPA 2.0 persistence library
required for OpenJPA 2.0.  The exception doesn't point to that type of issue though.  And
the app looks to be application managed so the 2.0 library may be overriding the 1.0 library
without ill effects to the container.

Tomcat 6 also includes JPA 1.0 persistence API classes, but only a small subset.  That could
causing the same type of API collision issue on that platform.  But, again, the failure doesn't
indicate this to be the problem.  I'll continue to debug the issue further and provide a fix,
if possible.

> Class linkage exception when creating an EMF with OpenJPA M3
> ------------------------------------------------------------
>
>                 Key: OPENJPA-1410
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1410
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: validation
>    Affects Versions: 2.0.0-M3
>         Environment: Tomcat and Glassfish, OpenJPA M3
>            Reporter: Jeremy Bauer
>            Assignee: Jeremy Bauer
>            Priority: Critical
>             Fix For: 2.0.0
>
>
> Posted by Seth Jackson on the user forum[1].
> It appears something was modified in OpenJPA 2.0 M3 from M2 that causes a
> LinkageError.
> In my current environment, I've tested both Glassfish and Tomcat using M2
> and M3. M2 runs without problems, but M3 throws a linkage error as follows:
> Caused by: java.lang.LinkageError: loader constraint violation: loader
> (instance of sun/misc/Launcher$AppClassLoader) previously initiated loading
> for a different type with name
> "org/apache/openjpa/conf/OpenJPAConfiguration"
>        at java.lang.ClassLoader.defineClass1(Native Method)
>        at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
>        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
>        at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
>        at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
>        at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
>        at java.security.AccessController.doPrivileged(Native Method)
>        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
>        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
>        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
>        at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
>        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
>        at
> org.apache.openjpa.persistence.validation.ValidationUtils.setupValidation(ValidationUtils.java:53)
>        at
> org.apache.openjpa.persistence.PersistenceProviderImpl.loadValidator(PersistenceProviderImpl.java:290)
>        at
> org.apache.openjpa.persistence.PersistenceProviderImpl.createEntityManagerFactory(PersistenceProviderImpl.java:97)
>        at
> org.apache.openjpa.persistence.OpenJPAPersistence.createEntityManagerFactory(OpenJPAPersistence.java:128)
>        at
> org.apache.openjpa.persistence.OpenJPAPersistence.createEntityManagerFactory(OpenJPAPersistence.java:111)
>        at test_test.user.UserAction.execute(UserAction.java:39)
> I've already confirmed that the OpenJPA classes in question do NOT exist in
> any other JARs in the path.
> ValidationUtils.setupValidation(ValidationUtils.java:53) calls the
> OpenJPAConfiguration.getConfigurationLog(). The object being referenced is
> JDBCConfigurationImpl, which in other classes retrieves the log reference
> perfectly fine, before it gets to the offending line.
> Seth's follow up[2]:
> After further review, using Glassfish 2.1.1 I received this error message in
> the server log:
> Caused by: java.lang.LinkageError: loader constraint violation: when
> resolving method
> "org.apache.openjpa.persistence.validation.ValidationUtils.setupValidation(Lorg/apache/openjpa/conf/OpenJPAConfiguration;)Z"
> the class loader (instance of org/apache/catalina/loader/WebappClassLoader)
> of the current class,
> org/apache/openjpa/persistence/PersistenceProviderImpl, and the class loader
> (instance of sun/misc/Launcher$AppClassLoader) for resolved class,
> org/apache/openjpa/persistence/validation/ValidationUtils, have different
> Class objects for the type org/apache/openjpa/conf/OpenJPAConfiguration used
> in the signature
> So it appears to be the WebappClassLoader and the AppClassLoader are both
> loading the OpenJPAConfiguration from the same JAR file, causing the error
> when the class is trying to be resolved in this particular method.
> [1] http://n2.nabble.com/Struts-2x-OpenJPA-2-0-M3-Tomcat-or-Glassfish-tp4087312p4087312.html
> [2] http://n2.nabble.com/Struts-2x-OpenJPA-2-0-M3-Tomcat-or-Glassfish-tp4087312p4093228.html

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