PM54417: OOM CAUSED BY EJB CONTAINER CCL LEAK

Fixes are available

APAR status

Closed as program error.

Error description

Customer expereinced java.lang.OutOfMemoryError in native heap.
CompoundClassLoader leak in EJB Container preventing GC to
unload the CCL. It had the following reference chain.

There are two issues in EJB Container reported by this APAR

0x023fe6b8 com/ibm/ws/classloader/CompoundClassLoader@21750ab
 0x028b1930 java/security/ProtectionDomain
  0x026f5de0 class com/ibm/websphere/startupservice/EJSRemoteSta
             telessTestModStartUpHome_6c26d2d3@5063c2
   0x028bed48 com/ibm/ejs/container/BeanMetaData@202b1f2
    0x028be1d0 com/ibm/websphere/startupservice/EJSStatelessTest
               ModStartUpHomeBean_6c26d2d3
     0x028ba870 com/ibm/ejs/csi/PoolImplThreadSafe@20c70cd
      0x0206f058 [Lcom/ibm/ejs/csi/PoolImplBase;
       0x02061a58 com/ibm/ejs/csi/PoolManagerImpl@4a76b8

0x023fe6b8 com/ibm/ws/classloader/CompoundClassLoader@21750ab
 0x028b1930 java/security/ProtectionDomain
  0x026ff4d0 class com/ibm/websphere/startupservice/_EJSRemoteSt
             atelessTestModStartUpHome_6c26d2d3_Tie@5079fe
   0x028bd940 com/ibm/websphere/startupservice/_EJSRemoteStatele
              ssTestModStartUpHome_6c26d2d3_Tie@20c9a4a
    0x02922bb0 com/ibm/rmi/IOR
     0x028c5cc0 com/ibm/CORBA/iiop/ClientDelegate@20c9c4f
      0x028c5df8 com/ibm/websphere/startupservice/_ModStartUpHom
                 e_Stub@20c9b6d
       0x028bd7a8 com/ibm/ws/naming/ipbase/BindingsTableData
        0x028b14c8 java/util/HashMap$Entry
         0x0207c140 [Ljava/util/HashMap$Entry;
          0x0239b280 java/util/HashMap
           0x023937b0 com/ibm/ws/naming/ipbase/NameSpace
            0x0238f988 com/ibm/ws/naming/jcache/Cache

Local fix

if not restarting application is possible, this may help the
problem occurs.

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server V6.1.0 and V8.0                      *
****************************************************************
* PROBLEM DESCRIPTION: Application class loaders are not       *
*                      garbage collected leading to            *
*                      increased native memory use             *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
The background thread for managing pools of EJB instances
retained a reference to the metadata for all EJBs it had
processed until it woke up to manage pools again.  These
references prevented application class loaders from being
garbage collected.
The startup bean service looked up home stubs using a
caching-enabled InitialContext associated with the server.
This cache was never cleared, which prevented application
class loaders from being garbage collected.

Problem conclusion

The background thread was modified to promptly clear
references to EJB metadata after running.  The startup bean
service was modified to use a caching-disabled InitialContext.

APAR PM54417 is currently targeted for inclusion in Service
Level (Fix Pack) 6.1.0.43 of WebSphere Application Server V6.1
and Fix Pack 8.0.0.3 of WebSphere Application Server V8.0.

The fix will also be delivered as sysrouted APAR PM55502 in
WebSphere Application Server V7.0 Fix Pack 7.0.0.23.

Please refer to URL:
//www.ibm.com/support/docview.wss?rs=404&uid=swg27006970
for Fix Pack availability.

Temporary fix

Comments

APAR Information

APAR number
PM54417
Reported component name
WEBSPHERE FOR Z
Reported component ID
5655I3500
Reported release
610
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2011-12-14
Closed date
2012-01-06
Last modified date
2012-04-03

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

PM55502

Fix information

Fixed component name
WEBSPHERE FOR Z
Fixed component ID
5655I3500

Applicable component levels

R610 PSY UK76696
UP12/03/18 P F203

Fix is available

Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SS7K4U","label":"WebSphere Application Server for z\/OS"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"6.1","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
28 October 2021

Tips

PM54417: OOM CAUSED BY EJB CONTAINER CCL LEAK

Fixes are available

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APAR status

Closed as program error.

Error description

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

APAR number

Reported component name

Reported component ID

Reported release

Status

PE

HIPER

Special Attention

Submitted date

Closed date

Last modified date

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

Fixed component ID

Applicable component levels

R610 PSY UK76696

Fix is available

Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.

Document Information

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