PM78020: VERIFYERROR WITH STACK UNDERFLOW DUE TO EXTRA 'RETURN' STATEMENTS GENERATED BY PCENHANCER.

PM78020; 8.5.0.1: verifyerror/stack underflow due to extra 'return' statements g
8.5.0.2: WebSphere Application Server V8.5 Fix Pack 2

APAR status

• Closed as program error.

Error description

• The following VerifyError occurs:
  
  Exception data: java.lang.VerifyError: JVMVRFY036 stack
  underflow; class=irwwbase/PersistentTimerStatsJPA,
  method=pcNewObjectIdInstance(Ljava/lang/Object;)Ljava/lang/Objec
  t;, pc=26
      at java.lang.J9VMInternals.verifyImpl(Native Method)
      at java.lang.J9VMInternals.verify(J9VMInternals.java:85)
      at
  java.lang.J9VMInternals.initialize(J9VMInternals.java:162)
      at java.lang.Class.forNameImpl(Native Method)
      at java.lang.Class.forName(Class.java:176)
      at
  org.apache.openjpa.meta.MetaDataRepository.classForName(MetaData
  Repository.java:1552)
      at
  org.apache.openjpa.meta.MetaDataRepository.loadPersistentTypesIn
  ternal(MetaDataRepository.java:1528)
      at
  org.apache.openjpa.meta.MetaDataRepository.loadPersistentTypes(M
  etaDataRepository.java:1506)
      at
  org.apache.openjpa.kernel.AbstractBrokerFactory.loadPersistentTy
  pes(AbstractBrokerFactory.java:282)
      at
  org.apache.openjpa.kernel.AbstractBrokerFactory.initializeBroker
  (AbstractBrokerFactory.java:238)
      at
  org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(Abstra
  ctBrokerFactory.java:212)
      at
  org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(Dele
  gatingBrokerFactory.java:156)
      at
  org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEn
  tityManager(EntityManagerFactoryImpl.java:227)
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server V8.5.0 who make use of the OpenJPA   *
  *                  PCEnhancer.                                 *
  ****************************************************************
  * PROBLEM DESCRIPTION: VerifyError/Stack underflow due to      *
  *                      extra 'return' statements generated     *
  *                      by PCEnhancer.                          *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  This issue occurs on, and is unique to, Java 7 and the OpenJPA
  enhancement code (as well as the entity definition). That is,
  in PCEnhancer OpenJPA is generating extra 'returns' in
  methods which throw an exception. These extra 'return'
  statements ultimately result in a java.lang.VerifyError.  This
  issue can occur when using an @IdClass as the primary key
  class for a JPA Entity, as follows:
  @Entity
  @IdClass(PersistentTimerStatsPK.class)
  public class PersistentTimerStatsJPA implements Serializable {
  ......
  public class PersistentTimerStatsPK implements Serializable {
  

Problem conclusion

• With this fix, code has been added to the OpenJPA PCEnhancer
  to ensure a VerifyError doesn't occur.
  
  The fix for this APAR is currently targeted for
  inclusion in Service Level (Fix Pack) 8.5.0.2 of WebSphere
  Application Server version 8.5.0.
  
  Please refer to the recommended updates page for delivery
  information:
  http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  PM78016

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  WEBSPHERE APP S

• Fixed component ID

  5724J0800

Applicable component levels

• R850 PSY

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