LARGE RESPONSES LEAD TO HTTPLISTENER OUT-OF-MEMORY

Error description

• The broker-wide HTTP Listener process retains large output
  buffers when processing large HTTP responses. This can
  eventually lead to OutOfMemory exceptions depending on the
  maximum JVM heap size configured for the HTTPListener, the size
  of the largest responses and the number of concurrent clients.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All users of WebSphere Message Broker V8.0 and IBM Integration
  Bus V9.0 who are using the broker-wide HTTP Listener.
  
  
  Platforms affected:
  z/OS, MultiPlatform
  
  ****************************************************************
  PROBLEM SUMMARY:
  The broker-wide HTTP Listener process sets the response buffer
  size to be equal to the size of the response message to
  prevent chunking. The tomcat server retains these large
  buffers and never re-sizes them down. This can eventually lead
  to java OutOfMemory exceptions depending on the maximum JVM heap
  size configured for the HTTPListener, the size of the largest
  responses and the number of concurrent clients.
  
  
  
  There are a number of resource name changes between WebSphere
  Message Broker and IBM Integration Bus Version 9.0. For
  details visit
  http://pic.dhe.ibm.com/infocenter/wmbhelp/v9r0m0/topic/com.ibm.e
  tools.mft.doc/bb23814_.htm
  

Problem conclusion

• The broker-wide HTTPListener no longer sets the response buffer
  size to be the size of the response message. Instead an HTTP
  Content-Length header is explicitly added.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v8.0       8.0.0.5
  v9.0       9.0.0.2
  
  The latest available maintenance can be obtained from:
  http://www-01.ibm.com/support/docview.wss?rs=849&uid=swg27006041
  
  If the maintenance level is not yet available, information on
  its planned availability can be found on:
  http://www-1.ibm.com/support/docview.wss?rs=849&uid=swg27006308
  ---------------------------------------------------------------