APAR status |
Closed as program error.
| Error description
Environment:
WebSphere Application Server (WAS) 3.5.3 Advanced Edition
.
Description:Environment:WebSphere Application Server (WAS) 3.5.3 Advanced Edition.
Customer has a servlet which spawns a thread which in turn
makes a call to MQSeries. In this scenario, when WAS security is
enabled, a memory leak occurs which eventually results in
OutOfMemory as objects instantiated by the servlet stay around
because security references to the objects don't go away. Description:Customer has a servlet which spawns a thread which in turnmakes a call to MQSeries. In this scenario, when WAS security isenabled, a memory leak occurs which eventually results inOutOfMemory as objects instantiated by the servlet stay aroundbecause security references to the objects don't go away. Local fixProblem summary
****************************************************************
* USERS AFFECTED: All WebSphere Application Server users *
* which have deployed servlets which are EJB *
* clients and instantiate new threads and *
* WebSphere security is enabled. *
****************************************************************
* PROBLEM DESCRIPTION: Security associates thread specific *
* data with the hashtables which *
* prevent the threads from being garbage *
* collected. *
****************************************************************
* RECOMMENDATION: *
****************************************************************
Security associates thread specific data with the hashtables
using the thread object as a key. Since there is a reference
to the thread object stored in a hashtable, the thread object
will not be garbage collected even if it has gone out of
context in the servlet. This issue can be exacerbated by
subclassing the thread in which the subclassed thread has
references to large data objects. Problem conclusion
Logic was added to the hashtables to periodically remove all
references to threads which were no longer executing. The
logic is activated if N new threads are added to the hashtable
since the last time the removal logic has run. N is a
tuneable value which defaults to 100 and is set by the
"com.ibm.CORBA.threadStateCleanupDelta" property. Temporary fix
An efix fix is available for 3.5.3. Comments
APAR information | APAR number | PQ55948 | Reported component name | WAS ADVANCED AI | Reported component ID | 5648C8400 | Reported release | 350 | Status | CLOSED PER | PE | NoPE | HIPER | NoHIPER | Submitted date | 2001-12-14 | Closed date | 2002-01-07 | Last modified date | 2002-09-10 |
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:APAR is sysrouted FROM one or more of the following:
Modules/Macros APAR is sysrouted TO one or more of the following:Modules/Macros
|
Fix information |
Fixed component name | WAS ADVANCED AI | Fixed component ID | 5648C8400 |
Applicable component levels | R350 PSY | UP |
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