PM18519: CLASSNOTFOUNDEXCEPTION IN MULTIPLE CLASS LOADER SETUP AFTER APPLYING IZ22312 IN 1.4.2 SR12

APAR status

• Closed as program error.

Error description

• Error Message: With multiple classloader policy on, certain
  application classes though available on the classpath may be
  falsely reported as not found.
  This problem may also manifest as ClassCastExceptions during a
  PortableRemoteObject.narrow()
  .
  Stack Trace: java.lang.ClassCastException: Unable to load class:
  com.a.b.ejb30._ISmokeBeanRemote_Stub
     at
  com.ibm.rmi.javax.rmi.PortableRemoteObject.narrow(PortableRemote
  Object.java:372)
     at
  javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:
  137)
     at
  com.ibm.etools.utc.servlet.JNDILookupHelper.jndiEJB3Load(JNDILoo
  kupHelper.java:148)
     ...
  OR
  com.ibm.rmi.util.Utility loadClassOfType:820 ORB.thread.pool :
  15 The following exception was logged
  java.lang.ClassNotFoundException:com.a.b.c.d.ObjectIdImpl
  at
  com.ibm.CORBA.iiop.UtilDelegateImpl.loadClass(UtilDelegateImpl.j
  ava:661)
  at javax.rmi.CORBA.Util.loadClass(Util.java:252)
  at com.ibm.rmi.util.Utility.loadClassOfType(Utility.java:817)
  at
  com.ibm.rmi.util.RepositoryId.loadClass(RepositoryId.java:677)
  at
  com.ibm.rmi.util.RepositoryId.checkClassCache(RepositoryId.java:
  651)
  at
  com.ibm.rmi.util.RepositoryId.getClassFromType(RepositoryId.java
  :609)
  at
  com.ibm.rmi.iiop.CDRInputStream.fast_read_value(CDRInputStream.j
  ava:2045)
  .
  

Local fix

Problem summary

• The CNFE or the CCE is caused by a bug in APAR due to which we
  do to call RMIClassLoader.loadClass() method that takes care of
  choosing the right classloader to load the needed class
  

Problem conclusion

• This defect will be fixed in:
  1.4.2 SR13FP6
  .
  The fix is ORB's classloading logic to use RMIClassLoader's
  loadClass() method, as specified in the IDL2Java specification.
  .
  To obtain the fix:
  Install build 20100814 or later
  

Temporary fix

Comments

APAR Information

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

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

Fix information

• Fixed component name

  JAVA(1.3/1.4 CO

• Fixed component ID

  5648C9800

Applicable component levels

• R42A PSN

     UP

• R42L PSN

     UP

• R42W PSN

     UP

• R420 PSN

     UP