PM20987: A ClassCastException may occur if two different JAX-RPC Web service clients are running in the same JVM.

Fixes are available

APAR status

Closed as program error.

Error description

A java.lang.ClassCastException error may occur if two different
JAX-RPC Web service clients are running in the same Java
Virtual Machine (JVM).

Here is an example error:
java.lang.ClassCastException:

com.acme.webservice1.Response
at
com.acme.webservice2.WS1Stub.myMethod(...)


The error may occur if all of the following criteria are met:

a) Two different JAX-RPC Web service clients
(example: WS1 and WS2) are invoked on different threads of the
same JVM.

b) The JAX-RPC Web services share the same XML type
(example {http://bus.com/webservice}Response)

c) The two JAX-RPC Web services map the common XML type to
different classes (com.bus.webservice1.Response1 and
com.bus.webservice2.Response2)

The error occurs because the JAX-RPC Web service stubs
uses the same registry (called a TypeMappingRegistry) to map
the Web service XML types to the Java classes.

------------

You may also require this solution if all of the following are
true:

* The following JVM property is enabled:
com.ibm.websphere.jaxrpc.stub.typemapping.per.thread=true
* You are experiencing an OutOfMemory error.
* The heapdump indicates that the following class uses a
substantial amount of memory (> 50M):
com.ibm.ws.webservices.engine.encoding.TypeMappingRegistryImpl

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  IBM WebSphere Application Server users of   *
*                  JAX-RPC Web services clients                *
****************************************************************
* PROBLEM DESCRIPTION: ClassCastException error may occur if   *
*                      multiple JAX-RPC clients are invoked    *
****************************************************************
* RECOMMENDATION:  Install a fix pack containing this APAR and *
*                  enable the custom JVM property (            *
*                  com.ibm.websphere.jaxrpc.stub.typemapping.p *
*                  er.stub).                                   *
****************************************************************
A java.lang.ClassCastException error may occur if two different
JAX-RPC Web service clients are running in the same Java
Virtual Machine (JVM).

Here is an example error:
java.lang.ClassCastException:

com.acme.webservice1.Response
 at
com.acme.webservice2.WS1Stub.myMethod(...)


The error may occur if all of the following criteria are met:

a) Two different JAX-RPC Web service clients
(example: WS1 and WS2) are invoked on different threads of the
same JVM.

b) The JAX-RPC Web services share the same XML type
(example {http://bus.com/webservice}Response)

c) The two JAX-RPC Web services map the common XML type to
different classes (com.bus.webservice1.Response1 and
com.bus.webservice2.Response2)

The error occurs because the JAX-RPC Web service stubs
uses the same registry (called a TypeMappingRegistry) to map
the Web service XML types to the Java classes.

------------

You may also require this solution if all of the following are
true:

  * The following JVM property is enabled:
    com.ibm.websphere.jaxrpc.stub.typemapping.per.thread=true
  * You are experiencing an OutOfMemory error.
  * The heapdump indicates that the following class uses a
substantial amount of memory (> 50M):
  com.ibm.ws.webservices.engine.encoding.TypeMappingRegistryImpl

Problem conclusion

The JAX-RPC runtime uses a single TypeMappingRegistry object
for all of the JAX-RPC clients.  This design is intentional,
and it allows customers to create a JAX-RPC stub and use it on
multiple threads.

However the singleton TypeMappingRegistry will be
contaminated if multiple JAX-RPC Web services with different
mappings are invoked concurrently.  This is an uncommon
scenario.

A new custom JVM property is introduced:
Property Name:
com.ibm.websphere.jaxrpc.stub.typemapping.per.stub
Property Value: true or false
Property Default: false

If this JVM property is set to true, the JAX-RPC runtime will
use stub specific type mapping objects.  These separate
mapping objects will avoid the contamination issue, and the
various web service calls will succeed.

Note: This JVM property should only be enabled if you
encounter the reported error.

Note: Enabling this property may increase the memory
footprint of the JAX-RPC engine, which could lead to
OutOfMemoryError errors.  IBM suggests that APAR PM19940
should also be installed along with this APAR.

Note: If you encounter problems, please consult APAR PM19223,
which provides an alternative property setting.

The fix for this APAR is currently targeted for inclusion in
fix packs 6.1.0.35, and 7.0.0.15.  The fix is available
for version 6.0.2, but it is not included in a fixpack.  Please
refer to the Recommended Updates page for delivery information:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980

Temporary fix

Comments

APAR Information

APAR number
PM20987
Reported component name
WEBSPHERE APP S
Reported component ID
5724J0800
Reported release
60A
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2010-08-21
Closed date
2010-09-27
Last modified date
2010-09-27

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
WEBSPHERE APP S
Fixed component ID
5724J0800

Applicable component levels

R60A PSY
UP
R60H PSY
UP
R60I PSY
UP
R60P PSY
UP
R60S PSY
UP
R60W PSY
UP
R60Z PSY
UP
R61A PSY
UP
R61H PSY
UP
R61I PSY
UP
R61P PSY
UP
R61S PSY
UP
R61W PSY
UP
R61Z PSY
UP
R700 PSY
UP

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"6.0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
25 October 2021

Tips

PM20987: A ClassCastException may occur if two different JAX-RPC Web service clients are running in the same JVM.

Fixes are available

Subscribe

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

R60A PSY

R60H PSY

R60I PSY

R60P PSY

R60S PSY

R60W PSY

R60Z PSY

R61A PSY

R61H PSY

R61I PSY

R61P PSY

R61S PSY

R61W PSY

R61Z PSY

R700 PSY

Document Information

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