IV29816: Virtual machine unnecessarily serializes class loading when class loader is parallel capable

APAR status

• Closed as program error.

Error description

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

Local fix

• N/A
  

Problem summary

• The Java virtual machine (VM) serializes multiple threads'
  concurrent attempts to load the same class using the same class
  loader.
  This prevents linkage errors from multiple attempts to define
  the class.
  Java 7 allows class loaders to manage concurrent class loading
  themselves if they register as parallel capable. This may be
  incompatible with the VM's
  serialization.
  

Problem conclusion

• This defect will be fixed in:
  7.0.0 SR4
  6.0.1 SR5
  .
  If the classloader is registered as parallel-capable, the VM
  disables serialization of concurrent class loading using that
  class loader.
  

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