Fix (APAR):  PK53885

Status:  Fix

Release:  6.1.0.11

Operating System:  AIX,HP-UX,i5/OS,Linux,OS/400,Solaris,Windows

Supersedes Fixes:  

CMVC Defect:  PK53885

Byte size of APAR:  18781

Date: 2007-10-10

Abstract:  Resource unexpectedly receives either a "writer already obtained" error or an "Outputstream already obtained" error.

Description/symptom of problem:  
PK53885 resolves the following problem:

ERROR DESCRIPTION:                                              
A servlet receives an IllegalStateException: writer already     
obtained when calling response.getOutputStream() for the first  
time in a request.                                              

LOCAL FIX:                                                      
N/A                                                             

PROBLEM SUMMARY

USERS AFFECTED:
IBM WebSphere Application Server version 6.1
users with resources which use a
HttpResponse object to obtain a writer
or an Ouputstream.

PROBLEM DESCRIPTION:
Resource unexpectedly receives either
a "writer already obtained" error or
an "Outputstream already obtained"
error.

RECOMMENDATION:
None

The problem occurs following an exception during commit of a
response. For example if the exception call stack includes:

com.ibm.ws.webcontainer.srt.SRTServletResponse.commit
(SRTServletResponse .java:xxx)
at
com.ibm.ws.webcontainer.srt.SRTServletResponse.finish
(SRTServletResponse .java:xxx)

the response object is not fully cleared for re-use by a
subsequent request. As a result, response settings for the
request  which received the exception are still in place for
a subsequent request which is allocated the same response
object. The settings which remain are:
-    whether or not getWriter() was used to obtain a writer.
-    whether or not getOutputStream() was used to obtain an
Outputstream.
-    the buffer size which was used.
-    the encoding which was used.
-    the address of a print writer if used

The first two will cause the error reported:

[9/14/07 13:13:28:484 EDT] 0000001e SystemErr   R
java.lang.IllegalStateException: SRVE0209E: Writer already
obtained

The other three could result in a request using incorrect
response settings.

PROBLEM CONCLUSION:                                             
The webcontainer has been updated to ensure that a response     
object is fully reset before it is allocated for used by a new  
request.                                                        
                                                                
The fix for this APAR is currently targeted for inclusion       
in fixpack 6.1.0.15.                                            
Please refer to the recommended updates page for delivery       
information:                                                    
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980   


Directions to apply fix:  
NOTE: Choose the:
1) Release the fix applies to
2) The Editions that apply
3) Delete the Editions & Methods that do not apply and this Note

Fix applies to Editions:
Release 6.0
__ Application Server (Express or BASE)
__ Network Deployment (ND)
__ WebSphere Business Integration Server Foundation (WBISF)
__ Edge Components
__ Developer
__ Extended Deployment (XD)

Install Fix to:
Method:
__ Application Server Nodes
__ Deployment Manager Nodes
__ Both

NOTE:
The user must:
* Have Administrative rights in Windows, or be the Actual Root User in a UNIX environments.
* Logged in with the same authority level when unpacking a fix, fix pack or refresh pack.
* Be at V6.0.2.2 or newer of the Update Installer. This can be checked by reviewing the level of the Update Installer in file <was_root>/updateinstaller/version.txt.

The Update Installer can be downloaded from the following link:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg21205991

For detailed instructions to Extract the Update Installer see the following Technote:
http://www-1.ibm.com/support/docview.wss?rs=180&uid=swg21205400

1) Copy PKxxxxx.pak file directly to the maintenance directory

2) Shutdown WebSphere
Manually execute setupCmdLine.bat in Windows or . ./setupCmdLine.sh in Unix from the WebSphere instance that maintenance is being applied to.

3) Launch Update Installer

4) Enter the installation location of the WebSphere product you want to update.

5) Select the "Install maintenance package" operation.

6) Enter the file name of the maintenance package to install (PKxxxxx.pak file which was copied in the maintenance directory).

7) Install the maintenance package.

8) Restart WebSphere

Directions to remove fix:  
NOTE:
* The user must have Administrative rights in Windows, or be the Actual Root User in a UNIX environments.
* FIXES MUST BE REMOVED IN THE ORDER THEY WERE APPLIED
* DO NOT REMOVE A FIX UNLESS ALL FIXES APPLIED AFTER IT HAVE FIRST BEEN REMOVED
* YOU MAY REAPPLY ANY REMOVED FIX

Example: If your system has fix1, fix2, and fix3 applied in that order and fix2 is to be removed, fix3 must be removed first, fix2 removed, and fix3 re-applied.

1) Shutdown WebSphere
Manually execute setupCmdLine.bat in Windows or . ./setupCmdLine.sh in Unix from the WebSphere instance that uninstall is being run against.

2) Start Update Installer

3) Enter the installation location of the WebSphere product you want to remove the fix.

4) Select  "Uninstall maintenance package" operation.

5) Enter the file name of the maintenance package to uninstall (PKxxxxx.pak).

6) UnInstall maintenance package.

7) Restart WebSphere

Directions to re-apply fix:  
1) Shutdown WebSphere.

2) Follow the Fix instructions to apply the fix.

3) Restart WebSphere.



Additional Information: