PH26778: AXIS2 JAXBUTILS CLASS CONSUMING LARGE AMOUNT OF MEMORY

APAR status

• Closed as program error.

Error description

• When creating several thousands unique JAX-WS Webservice
  clients JAXBUtils may grow in memory utilization, heap dump
  look similar to following
  
  The class
  "org.apache.axis2.jaxws.message.databinding.JAXBUtils", loaded
  by "<system class loader>", occupies 449,094,008 (40.69%)
  bytes. The memory is accumulated in one instance of
  "java.util.concurrent.ConcurrentHashMap$Node[]" loaded by
  "<system class loader>".
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  IBM WebSphere Application Server users of   *
  *                  JAX-WS Web Services                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: Axis2 JAXBUtils class consuming large   *
  *                      amount of memory                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  In certain Web services scenarios, memory analyzer tool shows
  large amount of memory being consumed by the Axis2 class:
  org.apache.axis2.jaxws.message.databinding.JAXBUtils. Memory
  Analyzer displays message like this:
  The class
  "org.apache.axis2.jaxws.message.databinding.JAXBUtils", loaded
  by "org.apache.axis2", occupies 448,797,791 (38.08%) bytes.
  The memory is accumulated in one instance of
  "java.util.concurrent.ConcurrentHashMap$Node[]" loaded by
  "com.ibm.oti.vm.BootstrapClassLoader
  

Problem conclusion

• The memory leak in Axis2 JAXBUtils class occurred because in
  certain Web services scenarios, a large number of different
  JAXB contexts were created and cached in memory in a short
  period of time, which did not provide enough time for Garbage
  Collector to run and cleanup unused JAXBContext cache entries.
  The Web services code was modified to limit the number of JAXB
  contexts that are stored in the cache if the JVM property:
  jaxws.JAXBContext.reduceHashMapMemory is set to true.
  
  The fix for this APAR is targeted for inclusion in fix packs
  8.5.5.19 and 9.0.5.6. For more information, see 'Recommended
  Updates for
  WebSphere Application Server':
  https://www.ibm.com/support/pages/node/715553
  

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

  WEBS APP SERV N

• Fixed component ID

  5724H8800

Applicable component levels

• R850 PSY

     UP

• R900 PSY

     UP