IT01721: IMPLEMENT JVM CUSTOM PROPERTY TO DISABLE XSLT CACHE SHARING

Version 8.5 Refresh Pack 6 for the IBM Business Process Manager products

APAR status

• Closed as program error.

Error description

• APAR IC91519 introduced a classloader-level caching mechanism.
  It made substantial improvements to throughput performance for
  BOs and XSLTs in deployed medation flows under concurrent
  load.We are not able to detect in all circumstances when a
  module with the same named map is redeployed so we are
  introducing a custom property for the customer to disable this
  caching.
  
  IC96845 - also corrects issues with the new XSLT cache which may
  avoid the need for customers to disable it via APAR IT01721
  

Local fix

• An alternative to using the custom property is to recycle the
  application server if such a module is deployed.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users of Business Process Manger v8 who are re-deploying
  mediation flow modules which include XSLT primitives.
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  APAR IC91519 introduced a classloader-level caching mechanism
  for XSLT primitives, specifically for the XSLT Style Sheets. It
  made substantial improvements to throughput performance for BOs
  and XSLTs in deployed mediation flows under concurrent load.
  
  However when a flow containing an XSLT primitive was re-deployed
  to the server any new versions of preexisting XSLT Style Sheets
  did not replace the ones already in the cache unless the server
  was recycled after re-deployment. This lead to the old versions
  of the style sheets being used at runtime (if the server was not
  recycled).
  

Problem conclusion

• A WebSphere environment variable has been implemented to allow
  an administrator to disable XSLT caching where this is
  problematic.
  
  The variable is defined using the Integrated Solutions Console,
  located under
  
  Environment -> WebSphere Variables.
  
  The variable must be defined as following:
  
  name: WESB_XSLT_CLASSLOADER_CACHING_VALUE
  value: false
  

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

  WESB IN BPM

• Fixed component ID

  AIMCMFC00

Applicable component levels

• R801 PSY

     UP