title: EclipseLink throws ArrayIndexOutOfBoundsException when trying to weave a class
body: <p>I've got play framework application (2.3.8) to which I provide eclipselink-2.5.1.jar agent. During startup I see in logs: </p>
  
  <blockquote>
    <p>Weaver encountered an exception while trying to weave class
    [<em>one of my JPA entities class</em>].  The exception was:
    java.lang.ArrayIndexOutOfBoundsException: 30053</p>
  </blockquote>
  
  <ol>
  <li>How can I investigate what's causing the problem?</li>
  <li>What might be a problem?</li>
  </ol>
  
  <p>UPDATE:
  So changing logging to finest gave me a stack trace:</p>
  
  <pre><code>EL Finest]: weaver: 2015-07-16 20:52:31.163--ServerSession(1547425104)--Thread(Thread[application-akka.actor.default-dispatcher-2,5,main])--java.lang.ArrayIndexOutOfBoundsException: 25970
          at org.eclipse.persistence.internal.libraries.asm.ClassReader.readClass(Unknown Source)
          at org.eclipse.persistence.internal.libraries.asm.ClassReader.getInterfaces(Unknown Source)
          at org.eclipse.persistence.internal.jpa.weaving.ComputeClassWriter.typeImplements(ComputeClassWriter.java:143)
          at org.eclipse.persistence.internal.jpa.weaving.ComputeClassWriter.typeImplements(ComputeClassWriter.java:150)
          at org.eclipse.persistence.internal.jpa.weaving.ComputeClassWriter.getCommonSuperClass(ComputeClassWriter.java:62)
          at org.eclipse.persistence.internal.libraries.asm.ClassWriter.getMergedType(Unknown Source)
          at org.eclipse.persistence.internal.libraries.asm.Frame.merge(Unknown Source)
          at org.eclipse.persistence.internal.libraries.asm.Frame.merge(Unknown Source)
          at org.eclipse.persistence.internal.libraries.asm.MethodWriter.visitMaxs(Unknown Source)
          at org.eclipse.persistence.internal.libraries.asm.MethodAdapter.visitMaxs(Unknown Source)
          at org.eclipse.persistence.internal.jpa.weaving.MethodWeaver.visitMaxs(MethodWeaver.java:152)
          at org.eclipse.persistence.internal.libraries.asm.ClassReader.accept(Unknown Source)
          at org.eclipse.persistence.internal.libraries.asm.ClassReader.accept(Unknown Source)
          at org.eclipse.persistence.internal.jpa.weaving.PersistenceWeaver.transform(PersistenceWeaver.java:93)
          at org.eclipse.persistence.internal.jpa.deployment.JavaSECMPInitializer$1.transform(JavaSECMPInitializer.java:228)
          at sun.instrument.TransformerManager.transform(TransformerManager.java:188)
          at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:428)
          at java.lang.ClassLoader.defineClass1(Native Method)
          at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
          at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
          at java.net.URLClassLoader.defineClass(URLClassLoader.java:455)
          at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
          at java.net.URLClassLoader$1.run(URLClassLoader.java:367)
          at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
          at java.security.AccessController.doPrivileged(Native Method)
          at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
          at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
          at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
          at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
          at java.lang.Class.forName0(Native Method)
          at java.lang.Class.forName(Class.java:340)
          at org.eclipse.persistence.internal.security.PrivilegedAccessHelper.getClassForName(PrivilegedAccessHelper.java:124)
          at org.eclipse.persistence.internal.jpa.metadata.listeners.EntityListenerMetadata.getClass(EntityListenerMetadata.java:224)
          at org.eclipse.persistence.internal.jpa.metadata.listeners.EntityClassListenerMetadata.process(EntityClassListenerMetadata.java:81)
          at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.EntityAccessor.processListeners(EntityAccessor.java:1220)
          at org.eclipse.persistence.internal.jpa.metadata.MetadataProcessor.addEntityListeners(MetadataProcessor.java:138)
          at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:591)
          at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getAbstractSession(EntityManagerFactoryDelegate.java:204)
          at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:304)
          at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:336)
          at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:302)
          at play.db.jpa.DefaultJPAApi.em(DefaultJPAApi.java:71)
          at play.db.jpa.DefaultJPAApi.withTransaction(DefaultJPAApi.java:123)
          at play.db.jpa.JPA.withTransaction(JPA.java:159)
          at play.db.jpa.TransactionalAction.call(TransactionalAction.java:16)
          at play.core.j.JavaAction$$anonfun$7.apply(JavaAction.scala:94)
          at play.core.j.JavaAction$$anonfun$7.apply(JavaAction.scala:94)
          at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)
          at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)
          at play.core.j.HttpExecutionContext$$anon$2.run(HttpExecutionContext.scala:40)
          at play.api.libs.iteratee.Execution$trampoline$.execute(Execution.scala:70)
          at play.core.j.HttpExecutionContext.execute(HttpExecutionContext.scala:32)
          at scala.concurrent.impl.Future$.apply(Future.scala:31)
          at scala.concurrent.Future$.apply(Future.scala:485)
          at play.core.j.JavaAction.apply(JavaAction.scala:94)
          at play.api.mvc.Action$$anonfun$apply$1$$anonfun$apply$4$$anonfun$apply$5.apply(Action.scala:105)
          at play.api.mvc.Action$$anonfun$apply$1$$anonfun$apply$4$$anonfun$apply$5.apply(Action.scala:105)
          at play.utils.Threads$.withContextClassLoader(Threads.scala:21)
          at play.api.mvc.Action$$anonfun$apply$1$$anonfun$apply$4.apply(Action.scala:104)
          at play.api.mvc.Action$$anonfun$apply$1$$anonfun$apply$4.apply(Action.scala:103)
          at scala.Option.map(Option.scala:145)
          at play.api.mvc.Action$$anonfun$apply$1.apply(Action.scala:103)
          at play.api.mvc.Action$$anonfun$apply$1.apply(Action.scala:96)
          at play.api.libs.iteratee.Iteratee$$anonfun$mapM$1.apply(Iteratee.scala:524)
          at play.api.libs.iteratee.Iteratee$$anonfun$mapM$1.apply(Iteratee.scala:524)
          at play.api.libs.iteratee.Iteratee$$anonfun$flatMapM$1.apply(Iteratee.scala:560)
          at play.api.libs.iteratee.Iteratee$$anonfun$flatMapM$1.apply(Iteratee.scala:560)
          at play.api.libs.iteratee.Iteratee$$anonfun$flatMap$1$$anonfun$apply$13.apply(Iteratee.scala:536)
          at play.api.libs.iteratee.Iteratee$$anonfun$flatMap$1$$anonfun$apply$13.apply(Iteratee.scala:536)
          at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)
          at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)
          at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:40)
          at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:397)
          at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
          at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
          at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
          at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
  </code></pre>
  
  <p>But it isn't much of a help for me.</p>