PK83641: CWSIT0039E ENTRIES ARE LOGGED IN THE JVM LOGS OF A SERVER HOSTING A MESSAGING ENGINE

Fixes are available

APAR status

Closed as program error.

Error description

The following error message is logged in the JVM logs of an
application server hosting a messaging engine:

CWSIT0039E: An internal error occurred. There is a connection
protocol error while communicating with messaging
engine <ME_NAME>, the received messagetype is null but the
expected message type is ME_CONNECT_REPLY.

An FFDC report containing the following details is also logged:
Exception = java.lang.IllegalStateException
Source = com.ibm.ws.sib.mfp.impl.JsMsgObject.encode
probeid = jmo550
Stack Dump = java.lang.IllegalStateException:
UniqueLinkObject not seen on handshake
at com.ibm.ws.sib.mfp.impl.SchemaManager.sendSchemas(
                                       SchemaManager.java:223)
at com.ibm.ws.sib.mfp.impl.JsMsgObject.
                                  encode(JsMsgObject.java:596)
at com.ibm.ws.sib.mfp.impl.TrmFirstContactMessageImpl.
                   encode(TrmFirstContactMessageImpl.java:260)
at com.ibm.ws.sib.trm.contact.MeConnectHandler.
                             connect(MeConnectHandler.java:90)
at com.ibm.ws.sib.comms.server.mesupport.MEConnectionImpl.
                            connect(MEConnectionImpl.java:345)
at com.ibm.ws.sib.trm.contact.Connect.contact(Connect.java:119)
at com.ibm.ws.sib.trm.contact.Neighbourhood.
                                  _scan(Neighbourhood.java:375)
at sun.reflect.NativeMethodAccessorImpl.
                                         invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.
                       invoke(NativeMethodAccessorImpl.java:85)
at sun.reflect.NativeMethodAccessorImpl.
                       invoke(NativeMethodAccessorImpl.java:58)
at sun.reflect.DelegatingMethodAccessorImpl.
       invoke(DelegatingMethodAccessorImpl.java(Compiled Code))
at java.lang.reflect.Method.invoke(Method.java(Compiled Code))
at com.ibm.ws.sib.trm.contact.Neighbourhood.
                                 direct(Neighbourhood.java:755)
at com.ibm.ws.sib.trm.general.ServiceThread.
                                     run(ServiceThread.java:79)

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  Users of the default messaging provider for *
*                  IBM WebSphere Application Server Version    *
*                  6.0, Version 6.1 or Version 7.0             *
****************************************************************
* PROBLEM DESCRIPTION: A FFDC report on a system contains      *
*                      the following exception:                *
*                      java.lang.IllegalStateException:        *
*                      UniqueLinkObject not seen on handshake  *
*                                                              *
*                      This exception can occur on             *
*                      server (or client application)          *
*                      connecting to the messaging engine      *
*                      over a network, or on a server          *
*                      hosting a messaging engine in a bus     *
*                      with multiple members.                  *
*                                                              *
*                      In addition the following error might   *
*                      seen in the JMV logs of a process       *
*                      running a messaging engine:             *
*                                                              *
*                      CWSIT0039E: An internal error           *
*                      occurred. There is a connection         *
*                      protocol error while communicating      *
*                      with messaging engine myME in bus       *
*                      myBus, the received message type is     *
*                      null but the expected message type is   *
*                      ME_CONNECT_REPLY.                       *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
The IllegalStateException exception occurs due to a problem
with network connection re-use logic within the JFAP component
of the service integration bus.
This code holds network connections open for re-use for a
short period of time before they are disconnected. This allows
a new messaging engine to messaging engine, or client to
messaging engine, connection to be established within
that time period without the overhead of creating a new
network connection.

There was a problem with the re-use code that caused the
creation of thew connection to fail, because some required
state associated with the connection had been discarded.
This caused the code requesting the connection to be thrown an
exception, and need to make an additional attempt to establish
the connection.

Problem conclusion

The fix for this APAR prevents the required state from being
discarded until after the connection has been removed from the
pool of JFAP network connections eligible for re-use.

The fix for this APAR is currently targeted for inclusion in
fix pack 6.0.2.37, 6.1.0.27 and 7.0.0.7.  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
PK83641
Reported component name
PLAT MSG COM
Reported component ID
620400101
Reported release
100
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2009-03-30
Closed date
2009-04-20
Last modified date
2009-05-06

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
PLAT MSG COM
Fixed component ID
620400101

Applicable component levels

R100 PSY
UP

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"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:
29 December 2021

Tips

PK83641: CWSIT0039E ENTRIES ARE LOGGED IN THE JVM LOGS OF A SERVER HOSTING A MESSAGING ENGINE

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

R100 PSY

Document Information

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