PK72159: OM SOFTREFERENCE TO WAS CL (2ND THREAD: CLASSTOCTORCACHE) REPOSI TORYID.REP_STR_TO_CLASS_CACHE

APAR status

• Closed as program error.

Error description

• Error Message: This APAR is to fix an OutOfMemory condition
  for a ClassLoader in the Java ORB.
  The issue is in the structure of the
  RepositoryId.REP_STR_TO_CLASS_CACHE
  ..
  The two threads are:
  ..
  com/ibm/rmi/io/IIOPInputStream.classToCtorCache
  ..
  com/ibm/rmi/util/RepositoryId.REP_STR_TO_CLASS_CACHE
  ..
  Here is an example of what L-2 might see
  during there OOM analysis.
  ..
  0x34a83390 com/ibm/ws/classloader/
  CompoundClassLoader
  0x3702cab0 sun/reflect/DelegatingClassLoader
  0x2da50c90 class sun/reflect/
  GeneratedSerializationConstructorAccessor255
  0x37034f88 sun/reflect/
  GeneratedSerializationConstructorAccessor255
  0x37034fb8 java/lang/reflect/Constructor
  0x37035000 java/util/
  Hashtable$HashtableCacheHashEntry
  0x3a2b44e0 java/util/
  Hashtable$HashtableCacheHashEntry
  0x384e6968 array of java/util/Hashtable$Entry
  0x34508bc0 java/util/Hashtable
  0x516c33d0 class com/ibm/rmi/io/
  IIOPInputStream.classToCtorCache
  ..
  0x34a83390 com/ibm/ws/classloader/
  CompoundClassLoader
  0x58ae08d8 class com/rbc/_7m00/message/getcards/
  SecafGetCardsRequest
  0x3aa22cb0 java/lang/ref/SoftReference
  0x3aa22cd0 java/util/WeakHashMap$Entry
  0x3aa22cf8 array of java/util/WeakHashMap$Entry
  0x33c53960 java/util/WeakHashMap
  0x33c53950 com/ibm/jtc/orb/map/
  CacheFactories$SoftCache.map
  0x5110dba0 class com/ibm/rmi/util/
  RepositoryId.REP_STR_TO_CLASS_CACHE
  .
  Stack Trace: N/A
  .
  

Local fix

Problem summary

• The problem is caused due to ORB's strongly held class caches
  which prevent the holding classloaders from getting GCed in
  time, which inturn do not free up the native representation of
  the classes in time, resulting in native OOMs.
  

Problem conclusion

• This defect will be fixed in:
  1.4.2 SR13
  1.4.2 SR13 (z/OS 64-bit)
  1.4.2 SR13 (Linux AMD64)
  1.4.2 SR13 (Windows AMD64)
  5.0.0 SR9
  .
  ORB code has been fixed to weakly hold on to classes
  appropriately. In certain scenarios, the need to cache the
  classes has been eliminated.
  .
  To obtain the fix:
  Install build 20081019 or later
  

Temporary fix

Comments

APAR Information

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

  PK72109

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

Fix information

• Fixed component name

  LIN AMD 64 JAVA

• Fixed component ID

  620400103

Applicable component levels

• R142 PSN

     UP