IV55245: JVM WRONGLY COMPARES THE BYTECODE OF A NATIVE METHOD DURING CLAS SFILE RETRANSFORMATION/REDEFINITION REQUESTED BY A JAVA AGENT OR

APAR status

• Closed as program error.

Error description

• Error Message: A dump event "gpf" received
  .
  Stack Trace:     {libj9jvmti26.so}{utfsAreIdentical}
      {libj9jvmti26.so}{fixMethodEquivalences}
      {libj9jvmti26.so}{redefineClassesCommon}
      {libj9jvmti26.so}{jvmtiRedefineClasses}
      {libinstrument.so}{redefineClasses}
  
  {libinstrument.so}{Java_sun_instrument_InstrumentationImpl_redef
  ineClasses0}
      {sun/instrument/InstrumentationImpl.redefineClasses0}
  .
  

Local fix

Problem summary

• The problem is caused when native methods exist in the class to
  be re-defined.
  

Problem conclusion

• This APAR will be fixed in the following Java Releases:
     6 R1 SR8       (6.1.8.0)
     7    SR7       (7.0.7.0)
     7 R1           (7.1.0.0)
     6    SR16      (6.0.16.0)
  .
  The JVM has been updated so that the native methods are properly
  handled during classfile retransformation/redefinition.
  

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

  J9 COMMON CODE

• Fixed component ID

  620700127

Applicable component levels

• R260 PSY

     UP

• R270 PSY

     UP

• R600 PSY

     UP