IJ53990: NOSUCHMETHODEXCEPTION OR NOCLASSDEFFOUNDERROR WHEN LOADING CLASSES

APAR status

• Closed as program error.

Error description

• Error Message: The JVM throws a NoSuchMethodException or
  NoClassDefFoundError when loading classes
  .
  Stack Trace: java.lang.NoClassDefFoundError:
  com.ibm.ws.classloading.internal.providers.Providers
          at
  com.ibm.ws.classloading.internal.AppClassLoader.<init>(App
  ClassLoader.java:172)
          at
  com.ibm.ws.classloading.internal.ClassLoaderFactory.createClassL
  oader(ClassLoaderFactory.java:138)
          at
  com.ibm.ws.classloading.internal.ClassLoaderFactory.create(Class
  LoaderFactory.java:116)
          at
  com.ibm.ws.classloading.internal.ClassLoadingServiceImpl.createA
  ppClassLoader(ClassLoadingServiceImpl.java:349)
          at
  com.ibm.ws.classloading.internal.ClassLoadingServiceImpl.createT
  opLevelClassLoader(ClassLoadingServiceImpl.java:321)
          at
  com.ibm.ws.classloading.internal.ClassLoadingServiceImpl.createT
  opLevelClassLoader(ClassLoadingServiceImpl.java:103)
  .
  

Local fix

Problem summary

• In the OpenJ9 JVM's internal hashtable code a check is performed
  twice, between which a new entry can be added by another thread,
  resulting in the wrong entry (in this case a class) being
  returned.
  

Problem conclusion

• The JVM is updated to perform the check only once. Further
  details can be found in OpenJ9 issue 20444:
  https://github.com/eclipse-openj9/openj9/issues/20444
  .
  This APAR will be fixed in the following Releases:
  .
  IBM Semeru Runtimes
     21              21.0.7.0
     17              17.0.15.0
     11              11.0.27.0
  IBM SDK, Java Technology Edition
     8    SR8 FP45  (8.0.8.45)
  .
  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:

• 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