IJ47758: MOCKITO FAILS WITH "CANNOT MOCK" EXCEPTIONS IN OPENJ9

APAR status

• Closed as program error.

Error description

• Error Message: org.mockito.exceptions.base.MockitoException:
  Could not modify all classes <OSB>... class
  java.lang.Object<CSB> Caused by:
  java.lang.instrument.UnmodifiableClassException
  .
  Stack Trace:
  .
  

Local fix

Problem summary

• OpenJ9 does not allow java.lang.Object to be
  modified/transformed at runtime, which prevents Mockito (and
  possibly other frameworks or scenarios) from working correctly.
  Mockito throws the following Exception:
  org.mockito.exceptions.base.MockitoException: Could not modify
  all classes [<other classes>, class
  java.lang.Object]
  With a "Caused by" Exception similar to this:
  Caused by: java.lang.instrument.UnmodifiableClassException
      at
  java.instrument/sun.instrument.InstrumentationImpl.retransformCl
  asses0(Native Method)
      at
  java.instrument/sun.instrument.InstrumentationImpl.retransformCl
  asses(InstrumentationImpl.java:167)
      ...
  Further information can be found in this Eclipse OpenJ9 issue:
  https://github.com/eclipse-openj9/openj9/issues/17454
  

Problem conclusion

• OpenJ9 has been updated to allow java.lang.Object to be
  transformed.
  .
  This APAR will be fixed in the following Releases:
  .
  IBM Semeru Runtimes
     11              11.0.21.0
     17              17.0.9.0
      8              8.0.392.0
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, information about the available
  maintenance can be found at:
             https://www.ibm.com/support/pages/java-sdk
  

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