IZ86862: JAVA/AWT/TOOLKIT SHOULD NOT DISABLE JIT COMPILATION.

APAR status

• Closed as program error.

Error description

• Error Message: N/A
  .
  Stack Trace: N/A
  .
  

Local fix

Problem summary

• java/awt/Toolkit calls java.lang.Compiler.disable() and then
  later java.lang.Compiler.enable(). Those calls seem to cause
  performance variability issues in applications that accidentally
  pull in awt (because some other important methods don't get
  compiled while the awt framework has the compiler disabled).
  

Problem conclusion

• This defect will be fixed in:
  6.0.0 SR9
  .
  Though It's possible to see the problem, but not very likely.
  There is a timing window while the compiler is disabled. In this
  window, any method whose invocation count reaches the threshold
  during this window will not be compiled and will be marked as
  never to be compiled. If a method that matters to performance
  happens to get into that window, then it shows up in the
  application. A customer running Java 6 SR5 ran into this
  problem, but they have not raised any PMR yet because they are
  actively rewriting the area of the code that caused the
  java/awt/Toolkit code to be initialized, so they do not expect
  to have this problem in future.
  Resolution
  To remove the JIT disabling-enabling code.
  .
  To obtain the fix:
  Install build 20101022 or later
  

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

  JAVA CLASS LIBS

• Fixed component ID

  620700130

Applicable component levels

• R600 PSN

     UP