JR54606: PROCESS ADMIN CONSOLE SHOWS A BLANK PAGE OR IBM BPM ERROR AFTER YOU APPLY A FIX PACK

Version 8.5.0 Fix Pack 2 for the IBM Business Process Manager products
Version 8.5 Refresh Pack 7 for the IBM Business Process Manager products

APAR status

• Closed as program error.

Error description

• After you apply an IBM Business Process Manager fix pack and
  then log in to the Process Admin Console, you might see an ?IBM
  BPM Error? error message with the text ?500 The call failed on
  the server; see server log for details.? or the Process Admin
  Console will show a blank page.
  
  The server log shows a
  com.google.gwt.user.client.rpc.SerializationException message,
  like the following exception:
  [10/16/15 17:20:34:444 CST] 00000178 webapp        I
  com.ibm.ws.webcontainer.webapp.WebApp log SRVE0296E:
  [IBM_BPM_ProcessAdmin_SingleCluster#ProcessAdmin.war][/ProcessAd
  min][Servlet.LOG]:.Exception while dispatching incoming RPC
  call:.com.google.gwt.user.client.rpc.SerializationException:
  Type 'com.lombardisoftware.gwtcommon.client.preferences.
    PreferencesDataObject' was not assignable to
    'com.google.gwt.user.client.rpc.IsSerializable' and did not
    have a custom field serializer.For security purposes, this
    type will not be serialized.: instance =
  com.lombardisoftware.gwtcommon.client.preferences.
   PreferencesDataObject@90dc9ccf
    at com.google.gwt.user.server.rpc.impl.
     ServerSerializationStreamWriter.serialize
     (ServerSerializationStreamWriter.java:619)
    at com.google.gwt.user.client.rpc.impl.
     AbstractSerializationStreamWriter.writeObject
     (AbstractSerializationStreamWriter.java:126)
    at com.google.gwt.user.server.rpc.impl.
     ServerSerializationStreamWriter$ValueWriter$8.write
     (ServerSerializationStreamWriter.java:153)
    at com.google.gwt.user.server.rpc.impl.
     ServerSerializationStreamWriter.serializeValue
     (ServerSerializationStreamWriter.java:539)
    ...
  

Local fix

• Clear the cache of your browser and reload the Process Admin
  Console.
  

Problem summary

• The Process Admin Console uses remote procedure calls (RPC) to
  communicate with the IBM BPM server. To ensure that the client
  part and the server part of the Process Admin Console are at the
  same level, a unique version number is transmitted when remote
  procedures are called, as part of the call. If the version
  number on the server differs from version number of the incoming
  procedure call, the server denies this call and issues the
  com.google.gwt.user.client.rpc.SerializationException message.
  
  When the fix pack was installed, the server part of the Process
  Admin Console and version numbers were changed. Because the
  Process Admin Console used a wrong caching algorithm, the
  browser is not aware of this change and uses the old version
  numbers, leading to the mismatch and the exception message.
  

Problem conclusion

• A fix that corrects the caching algorithm so that changes done
  to the RPC server parts and version numbers are immediately
  visible to the browser is planned
  - to be included in a future fix pack for IBM BPM V8.5.0
  - to be included in an IBM BPM V8.5.6.0 cumulative fix
  
  To determine whether the fix pack is available and download it
  if it is, on Fix Central select IBM Business Process Manager
  with your edition from the product selector, the installed
  version to the fix pack level, and your platform, and then click
  Continue.
  

Temporary fix

• Not applicable
  

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

  BPM STANDARD

• Fixed component ID

  5725C9500

Applicable component levels

• R850 PSY

     UP

• R856 PSY

     UP