IV69354: PERFORMANCE OVERHEAD WITH JAVABEANS INTROSPECTOR CACHE AFTER APPLYING APAR IV61544

PI34674: SHIP JDK IV69354 AS AN IFIX FOR WAS 8.0
PI34784: SHIP JDK IV69354 AS AN IFIX FOR WAS 7
PI35615: SHIP JDK IV69354 IV69616 FOR JAVA 626 AS AN IFIX FOR WAS 8.5
PI37006: SHIP JAVA 6/26 SR8 FP3 + IV69354+IV69616+IV68447+IV70681 FOR WAS 8555
PI37009: SHIP JAVA 6/26 SR8 FP2 + IV68447+IV69354+IV66608+IV66375+IX90155+IV66944+IV66991+IV70681 for WAS 8554
PI37010: SHIP JAVA 6/26 SR8 FP2 + IV68447+IV69354+IV66608+IV66375+IX90155+IV66944+IV66991+IV70681
PI37013: SHIP JAVA 6 SR16 FP3 + IV69354+IV70681 FOR WAS 70037
PI37014: SHIP JAVA 6 SR16 FP1 + IV64658+IV64659+IV70681 FOR WAS 70035
PI38186: Ship Java 6/26 SR8 FP3 +IV69354+IV69616+IV68447+IV70681 for WAS800x
PI42772:

APAR status

• Closed as program error.

Error description

• Error Message: N/A
  .
  Stack Trace: N/A
  .
  Performance benchmark test shows a regression of 7% with java 6
  SR16 FP2 & 6.0.1 SR8 FP2 compared to java 6 SR16 FP1 & 6.0.1 SR8
  FP1. The performance regression is observed in all platforms.
  

Local fix

Problem summary

• In Java 6 implementation, Introspected java beans are stored in
  a cache (WeakHashMap whose value is stored as WeakReference)
  which clears the entries when there is no strong reference.
  Because of this, beanclass is re-introspected when lookup for
  BeanInfo happens in cache again and again.
  

Problem conclusion

• JDK has been updated to modify the cache implementation which
  now use LRUCache along with WeakHashMap thus reduce the no.of
  times re-introspection happens.
  .
  This APAR will be fixed in the following Java Releases:
     6 R1 SR8 FP4   (6.1.8.4)
     6    SR16 FP4  (6.0.16.4)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, information about the Service
  Refreshes and Fix Packs can be found at:
             https://www.ibm.com/developerworks/java/jdk/
  

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:

  PI49919

Fix information

• Fixed component name

  JAVA CLASS LIBS

• Fixed component ID

  620700130

Applicable component levels

• R600 PSY

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