PQ96915; 5.1.1.3: PLGN007 ERROR. HTTP TRANSPORT HAS A PROBLEM OF NOT IMMEDIATELY
 Downloadable files
 
Abstract
An "OSEListenerDi E PLGN0007E: Engine Throwable" error can be seen if the plugin does not send a valid request within the connection time out period after sending an Extended Hands
 
Download Description
PQ96915 resolves the following problem:

ERROR DESCRIPTION:
The webserver/plugin is opening a connection to the application server, sending the extended handshake msg to the http transport, and then closing the connection after it receives an HTTP OK response. This causes an exception to occur in the HTTP Transport while trying to read the request. There is an error in the transport in that it should immediately halt processing on the connection, but it does not do that. Instead it hands the NULL request off to the servlet engine to handle and that leads to the PLGN007 error.

PROBLEM SUMMARY:

USERS AFFECTED:
WebSphere Application Server users of the Extended Handshake feature for the plugin.

PROBLEM DESCRIPTION:
An "OSEListenerDi E PLGN0007E: Engine Throwable" error can be seen if the plugin does not send a valid request within the connection time out period after sending an Extended Handshake request.

RECOMMENDATION:
The plugin sends an "Extended Handshake" request to the Application Server to check if it is alive.
HttpConnection.readAndHandleRequest() responds to the request and then invokes HttpRequest.readRequest() to read the real request, which it assumes will be sent next. If a request is
not received within the time out period, HttpRequest.readRequest() returns an error code to
HttpConnection.readAndHandleRequest().

The "Extended Handshake" processing fails to check for an
error from HttpRequest.readRequest and calls the engine code to handle the request. Since no request had been received, the request information is NULL and the engine will encounter the PLGN007 error.

PROBLEM CONCLUSION:
HttpConnection.readAndHandleRequest() had been changed to treat the Extended Handshake as a separate request. This allows the normal KeepAlive processing to handle the process of waiting for the next request and handling a time out if no request is sent.

The fix for this problem is currently targeted for inclusion in service pack 5.0.2.10 & 5.1.1.4. Please refer to the Recommended Updates page for delivery dates: http://www.ibm.com/support/docview.wss?&context=SSEQTP&uid=swg27004980
 
Prerequisites
PQ85432 for some versions. See the associated readme for details
 
URL LANGUAGE SIZE(Bytes)
UpdateInstaller US English 7250000
 
 
Installation Instructions
Please review the readme.txt for detailed installation instructions.
 
URL LANGUAGE SIZE(Bytes)
Readme US English 2431
 
Download package
What is DD?
Download RELEASE DATE LANGUAGE SIZE(Bytes) Download Options
PQ96915_5029.jar 3/2/2005 US English 42639 FTP DD
PQ96915_5026.jar 3/2/2005 US English 42597 FTP DD
PQ96915_5105.jar 3/2/2005 US English 42488 FTP DD
PQ96915_5022.jar 3/2/4263 US English 42639 FTP DD
PQ96915_5113.jar 3/2/2005 US English 20393 FTP DD
 
Technical support
1-800-IBM-SERV (U.S. Only)
 
Cross Reference information
Segment Product Component Platform Version Edition
Application Servers Runtimes for Java Technology Java SDK
Problems (APARS) fixed
PQ94233, PQ91905
 
 


Document Information


Product categories: Software > Application Servers > Distributed Application & Web Servers > WebSphere Application Server > HTTP Transport
Operating system(s): Windows
Software version: 5.1.1.3
Software edition:
Reference #: 4009065
IBM Group: Software Group
Modified date: Mar 5, 2005