PM45922: CONCURRENTMODIFICATIONEXCEPTION WHEN ITERATING OVER THE LIST OF DATAOBJECTS FOR A MANY-VALUED PROPERTY.

APAR status

• Closed as program error.

Error description

• A ConcurrentModificationException should be thrown if
  the list over which it is currently iterating is modified
  structurally - that is, items are added or removed. But the SDO
  implementation is a bit too sensitive, and it is triggering
  this exception even when a property of one of the DataObjects
  in the list is changed.
  

Local fix

• using the CopyOnWriteArrayList because it does not use an
  iterator over the original List, and it is correct to iterate
  over this list in this way because the structure is not
  actually changing.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  Users of WebSphere Application Server v7    *
  *                  Feature Pack for Service Component          *
  *                  Architecture (SCA) Refresh Pack v1.0.1      *
  ****************************************************************
  * PROBLEM DESCRIPTION: ConcurrentModificationException when    *
  *                      iterating an SDO list                   *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When iterating over the list of DataObjects for a many-valued
  property of a complex type, a ConcurrentModificationException
  may be thrown if any of the DataObjects in the list are
  modified, for example, by setting a property.
  A ConcurrentModificationException should be thrown if the list
  is modified structurally by adding, removing, or replacing
  DataObjects, but simply setting a property of one of the
  original DataObjects should not cause this exception.
  Currently, this type of modification causes changes in the
  internal SDO list implementation that, to an Iterator, will
  appear to be structural in nature. In response, an Iterator
  may raise a ConcurrentModificationException.
  

Problem conclusion

• The list implementation has been corrected such that setting a
  property on a DataObject within a list will not result
  observable changes that an Iterator may assume to be structural.
  
  APAR PM45922 is currently targeted for inclusion in Service
  Level (Fix Pack) 1.0.1.13 of WebSphere Application Server v7
  Feature Pack for Service Component Architecture (SCA) Refresh
  Pack. 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:

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

  PM47832

Fix information

• Fixed component name

  WAS SCA FEATURE

• Fixed component ID

  5724J0854

Applicable component levels

• R700 PSY

     UP