PI12310: A NullPointerException exception or other unexpected behavior occurs when you use a deserialized object.

APAR status

• Closed as program error.

Error description

• If a class is defined within another class and is not defined as
  static, then there is a reference to the enclosing class from
  the nested class.  When the nested object is serialized, the
  enclosing class is not being serialized. Therefore, during
  deserialization, the reference to the enclosing class is null.
  This behavior can lead to NullPointerException exceptions
  when accessing methods or non-static fields from the enclosing
  class.  The ArrayBlockingQueue is an example of such a class
  that has encountered this problem; for example:
  
  [11/12/13 12:39:35:442 GMT+05:30] 000000ca LogSequenceIm W
  CWOBJ0006W: An exception occurred:
  com.ibm.websphere.objectgrid.ObjectGridRuntimeException:
  java.io.IOException: An exception occurred during java
  serialization - null.  The class was <class_name>
  at
  com.ibm.ws.objectgrid.xdf.XDFSerializerPlugin.throwRuntimeExcept
  ion(XDFSerializerPlugin.java:285)
  at
  com.ibm.ws.objectgrid.xdf.XDFSerializerPlugin.serializeDataObjec
  t(XDFSerializerPlugin.java:264)
  at
  com.ibm.ws.objectgrid.plugins.io.dataobject.values.ValueDataImpl
  .autoSerialize(ValueDataImpl.java:234)
  at
  com.ibm.ws.objectgrid.plugins.io.dataobject.values.ValueDataImpl
  .checkBufferAndSerialize(ValueDataImpl.java:156)
  at
  com.ibm.ws.objectgrid.plugins.io.dataobject.values.ValueDataImpl
  .isIndirectHeapBuffer(ValueDataImpl.java:149)
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  Applications with enclosing classes         *
  *                  that run with data grids, which have XIO    *
  *                  and COPY_TO_BYTES maps.                     *
  ****************************************************************
  * PROBLEM DESCRIPTION: A class type that is defined within     *
  *                      an enclosing object is serialized       *
  *                      but the enclosing object is not being   *
  *                      serialized.                             *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  If a class is defined within another class and is not defined
  as static, then there is a reference to the enclosing class
  from the nested class.  When the nested object is serialized,
  the enclosing class is not being serialized. Therefore, when
  deserialization occurs, the reference to the enclosing class
  is null. This behavior can lead to NullPointerException
  exceptions when accessing methods or non-static fields from
  the enclosing class.  The ArrayBlockingQueue is an example of
  such a class that has encountered this problem.
  

Problem conclusion

• A code change to also serialize the enclosing class has been
  made to resolve this problem.  The data in the grid must be
  re-created with an updated client, if this problem is
  encountered.
  

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

  WS EXTREME SCAL

• Fixed component ID

  5724X6702

Applicable component levels

• R860 PSY

     UP