PM41571: OPENJPA DOESN'T FIND VALUEHANDLER AND/OR FIELDSTRATEGY CLASS WITH AN APPLICABLE CLASS LOADER

6.1.0.47: WebSphere Application Server V6.1 Fix Pack 47

APAR status

• Closed as program error.

Error description

• Issue making the openJpa work with WebSphere Application Server
  6.1.0.31 + Feature Pack for EJB 3.0
  
  See the error thrown below:
  
  [08/04/11 15:53:37:514 UTC] 00000020 SystemOut     O
  
  <openjpa-1.0.4-SNAPSHOT-r420667:908274 fatal user error>
  org.apache.openjpa.persistence.ArgumentException: The type for
  "test.aaa.bbb" is mapped to custom
  strategy"test.DecimalWrapperValueHandler", but this strategy
  cannot beinstantiated.
  at
  org.apache.openjpa.jdbc.meta.MappingRepository.mappedStrategy(Ma
  ppingRepository.java:953)
  at
  org.apache.openjpa.jdbc.meta.MappingRepository.defaultStrategy(M
  appingRepository.java:750)
  
  ::::::::::::::
  
  
  Caused by: <openjpa-1.0.4-SNAPSHOT-r420667:908274 fatal user
  error>
  org.apache.openjpa.persistence.ArgumentException: The class name
  "test.DecimalWrapperValueHandler" used in a metadata extension
  on field"test.aaa.bbb" is not valid.
  at
  org.apache.openjpa.meta.JavaTypes.classForName(JavaTypes.java:22
  7)
  at
  org.apache.openjpa.meta.JavaTypes.classForName(JavaTypes.java:19
  4)
  

Local fix

• candidate to be fixed in next release
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server Feature Pack for EJB 3.0 who use     *
  *                  an OpenJPA ValueHandler or FieldStrategy.   *
  ****************************************************************
  * PROBLEM DESCRIPTION: OpenJPA doesn't find a ValueHandler     *
  *                      and/or FieldStrategy class with an      *
  *                      applicable class loader.                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When a user's JPA entities makes use of (implement) an OpenJPA
  'org.apache.openjpa.jdbc.meta.ValueHandler' or
  'org.apache.openjpa.jdbc.meta.FieldStrategy', a potential
  exists for said classes/implementation to not be found by the
  current classloader.  That is, take the following code as an
  example:
  package test;
  @Entity
  public class TestEntity {
  @Id
  private Long id;
  @Persistent
  @Strategy("test.MyStringValueHandler")
  private String testString;
  .....
  package test;
  public class MyStringValueHandler extends
  org.apache.openjpa.jdbc.meta.strats.AbstractValueHandler {
  .....
  When OpenJPA attempts to load the 'MyStringValueHandler'
  class (the class listed in the @Strategy annotation), it may
  not be able to load the class depending on the classloader in
  use.  In this case OpenJPA is attempting to load the class
  with the wrong classloader.  Thus the following exception
  results:
  org.apache.openjpa.persistence.ArgumentException: The type for
  "test.TestEntity.testString" is mapped to custom
  strategy "test.MyStringValueHandler", but this strategy
  cannot be instantiated.
  

Problem conclusion

• With this fix, code has been added to ensure that OpenJPA uses
  the correct classloader when it attempts to load a class
  which has implemented a 'ValueHandler' or 'FieldStrategy'
  interface.
  
  The fix for this APAR is currently targeted for inclusion
  in Enterprise JavaBeans 3.0 Feature Pack Fix Pack 43
  (6.1.0.43) of WebSphere Application Server version
  6.1.0.
  

Temporary fix

Comments

APAR Information

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

  PM37821

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

Fix information

• Fixed component name

  WAS EJB3 FEATUR

• Fixed component ID

  5724J0851

Applicable component levels

• R610 PSY

     UP