IV44500: NULLPOINTEREXCEPTION WHEN USING JAVA.BEANS.XMLENCODER WITH COLLECTIONS.SYNCHRONIZEDLIST AFTER APPLYING IZ85781

APAR status

• Closed as program error.

Error description

• Error Message: Customer is using XMLEncoder to serialize
  synchronized List created by
  Collections.synchronizedList(ArrayList) and gets
  NullPointerException.
  .
  Stack Trace: Failure in class java.lang.NullPointerException
  
  Exception in thread "main" java.lang.NullPointerException
  
   at
  
  java.beans.UtilCollectionsPersistenceDelegate.mutatesTo(UtilColl
  ectionsP
  ersistenceDelegate.java:59)
  
   at
  
  java.beans.PersistenceDelegate.writeObject(PersistenceDelegate.j
  ava:118)
   at java.beans.Encoder.writeObject(Encoder.java:425)
  
   at java.beans.XMLEncoder.writeObject(XMLEncoder.java:1009)
  
   at Test.testEncoder(Test.java:19)
  
   at Test.main(Test.java:8)
  .
  N/A
  

Local fix

• Use ArrayList to serialize instead of generating synchronized
  List by Collections.synchronizedList(ArrayList).
  

Problem summary

• The crash occurs when verifying "dead code" in classes that have
  been stored in the shared classes cache using the StackMapTable
  attribute.
  

Problem conclusion

• The JVM has been updated to properly handle dead code in classes
  stored in the shared classes cache.
  

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 CLASS LIBS

• Fixed component ID

  620700130

Applicable component levels

• R600 PSY

     UP

• R700 PSY

     UP