IJ06641: JAVA.LANG.SECURITYEXCEPTION: SHA MESSAGEDIGEST NOT AVAILABLE EXCEPTION WITH CONCURRENT SCAVENGER

APAR status

• Closed as program error.

Error description

• Error Message: The exception may occur when running with
  -Xgc:concurrentScavenge option, while loading security
  providers, but unable to run particular Security Algorithm (SHA
  in this case), even though it's available from the loaded
  provider
  .
  Stack Trace:
  .
  

Local fix

• This issue can be avoided by removing -Xgc:concurrentScavenge
  option.
  

Problem summary

• The file stream that loads preferred Security Provider would
  suddenly close, so that default Sun security provider would be
  loaded, which may not support the requested Security Algorithm.
  Underlying problem is missing 'read barrier' in
  Unsafe::compareAndSwapObject, which is used for maintaining file
  stream state.
  

Problem conclusion

• Unsafe::compareAndSwapObject calls have been updated to call
  properly call read barrier, which in turn will prevent sudden
  closure of open file streams, which in turn will allow to
  properly load files (like Security provider properties) till
  completion.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR5 FP20  (8.0.5.20)
     8    SR5 FP17  (8.0.5.17)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, information about the available
  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:

  IJ06678

Fix information

• Fixed component name

  J9 COMMON CODE

• Fixed component ID

  620700127

Applicable component levels

• R270 PSY

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