PK86979: UNABLE TO DISABLE CLASS PRELOADING THROUGH THE ADMINISTRATIVE CONSOLE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When trying to disable class preloading through the
  administrative console:
  
  Application Servers -> server_name -> Java and Process
  Management -> Process Definition -> <Control|Adjunct|Servant> >
  Java Virtual Machine > -Dibm.websphere.preload.classes=false for
  Generic JVM arguments.
  
  two entries are writen to the *.jvm.options file.  One set to
  true and the other set to false.  Both are passed to java, but
  the 'true' entry is passed last so the 'false' cannot be set.
  The default setting for class preloading is true, and
  -Dibm.websphere.preload.classes=true can be found in the
  *.jvm.options files prior to making any changes through the
  administrative console.
  

Local fix

• Modify the node level variables.xml file, changing
  -Dibm.websphere.preload.classes=true to
  -Dibm.websphere.preload.classes=false.  The preload option is
  found on the following line:
  
  <entries xmi:id="VariableSubstitutionEntry_52"
  symbolicName="WAS_SERVER_ONLY_default_jvm_options"
  ...
  -Dibm.websphere.preload.classes=true
  ...
  description="default jvm options"/>
  
  Then save the file back on your HFS and run the command:
  
  /<configRoot>/bin/wsc2n.sh -X
  
  This will propogate the value to your native config files
  (including the *.jvm.options files).
  
  Restart the Application Server after the changes are made.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere Application Server    *
  *                 V6.1 for z/OS                                *
  *                                                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Fail to disable class preloading        *
  *                      through the administrative console      *
  *                      using GenericJVMArgs                    *
  *                                                              *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Browse to the following link in the administrative console:
  
  Application Servers -> server_name -> Java and Process
  Management -> Process Definition -> <Control|Adjunct|Servant> >
  Java Virtual Machine > -Dibm.websphere.preload.classes=false
  for Generic JVM arguments. Save and Synch the settings.
  
  Two entries are written to the *.jvm.options file. One set to
  'true' and the other set to 'false'. Both are passed to java,
  but the 'true' entry is getting passed last, so the intended
  'false' value cannot be set. For V6.0.1 only, the default
  setting for class preloading is true, and
  -Dibm.websphere.preload.classes=true can be found under
  node-level variables.xml file prior to making any changes.
  Environment -> WebSphere Variables panel shows the default
  options as WAS_SERVER_ONLY_default_jvm_options.
  

Problem conclusion

• The code creating the *.jvm.options files was changed to
  properly handle the GenericJVMArgs and only create one instance
  of the property in the *.jvm.options file.
  
  APAR PK86979 is currently targeted for inclusion in Service
  Level (Fix Pack) 6.1.0.25 of WebSphere Application Server V6.1
  for z/OS.
  
  Please refer to URL:
  //www.ibm.com/support/docview.wss?rs=404&uid=swg27006970
  for Fix Pack availability.
  

Temporary fix

Comments

APAR Information

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

  PK67471

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

Modules/Macros

• BBGUBINF BBOUBINF
  

Fix information

• Fixed component name

  WEBSPHERE FOR Z

• Fixed component ID

  5655I3500

Applicable component levels

• R610 PSY UK47214

     UP09/06/22 P F906

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.