IJ51325: ENABLING -XSHARECLASSES MAY TRIGGER NOCLASSDEFFOUNDERRORS IN CERTAIN CIRCUMSTANCES

APAR status

• Closed as program error.

Error description

• Error Message: NoClassDefFoundError: <class name>
  .
  Stack Trace:
  .
  

Local fix

• Disable the shared classes cache by removing the -Xshareclasses
  option from the command line.
  

Problem summary

• The problem occurs when a JAR file contains a JarIndex, and the
  application is reliant on that JarIndex to locate required
  classes. The JarIndex was not being searched when the shared
  classes cache was enabled.
  

Problem conclusion

• The issue has been addressed in Semeru pull request 331:
  https://github.com/ibmruntimes/openj9-openjdk-jdk17/pull/331
  If necessary, the previous behaviour can be restored by setting
  the following system property:
  com.ibm.oti.shared.disableJarIndex=true
  .
  This APAR will be fixed in the following Releases:
  .
  IBM Semeru Runtimes
     17              17.0.11.0
     11              11.0.23.0
  IBM SDK, Java Technology Edition
     8    SR -      (8.0.-.0)
  .
  Downloads and supplementary documentation can be found at the
  following locations:
  - For non z/OS operating systems:
    - IBM Semeru Runtimes, Version 11 and later
      https://www.ibm.com/semeru-runtimes/downloads/
    - IBM SDK, Java Technology Edition, Version 8
      https://www.ibm.com/support/pages/java-sdk-downloads/
  - For the z/OS operating system:
    - Java SDK Products on z/OS
      https://www.ibm.com/support/pages/java-sdk-products-zos
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IJ51324

• 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