PM03636: LOOP IN DYNACACHE AFTER 404 RESPONSE IS CACHED UNDER CERTAIN CONDITIONS.

Fixes are available

APAR status

Closed as program error.

Error description

When servlet caching is enabled and a cachespec.xml that uses
the SimpleFileServlet technique to cache static files is
available in the web module:
  <cache-entry>
      <class>static</class>
        <name>com.ibm.ws.webcontainer.servlet.
                        SimpleFileServlet.class</name>
      <cache-id>
         <component id="" type="pathinfo">
            <required>true</required>
         </component>
         <component id="If-Modified-Since" type="header">
            <required>false</required>
         </component>
         <timeout>1800</timeout>
      </cache-id>
  </cache-entry>

Requesting a nonexistent resource causes HTTP 404 error code
to be cached. On a subsequent request for the same resource,
the request enters an infinite loop and this causes a
StackOverflowError.

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server V6.1.0 using servlet caching with    *
*                  content with an error HTTP response code.   *
****************************************************************
* PROBLEM DESCRIPTION: An application may not expect content   *
*                      to be cached on a cache miss with an    *
*                      error HTTP response status code.        *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
Dynacache does not look at the HTTP response code to determine
an error occurred and caches the cache miss.  When a
subsequent cache hit occurs the cached output is returned with
the error.

Problem conclusion

A new JVM custom property is being introduced,
com.ibm.ws.cache.CacheConfig.filteredStatusCodes.  This JVM
custom property contains a space delimited list of HTTP
response error codes.  Dynacache will not cache the content on
a cache miss if the status code is one of the error codes in
the list.

APAR PM03636 is currently targeted for inclusion in
Service Level (Fix Pack) 6.1.0.33 of WebSphere
Application Server V6.1.

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
PM03636
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
2009-12-15
Closed date
2010-03-30
Last modified date
2010-10-02

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

PM05607

Fix information

Fixed component name
WEBSPHERE FOR Z
Fixed component ID
5655I3500

Applicable component levels

R610 PSY UK59848
UP10/09/11 P F009

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":"BU053","label":"Cloud & Data Platform"},"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:
24 October 2021

Tips

PM03636: LOOP IN DYNACACHE AFTER 404 RESPONSE IS CACHED UNDER CERTAIN CONDITIONS.

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

R610 PSY UK59848

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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