PM93069: INCORRECTLY INVOKING A FILTER MUTLIPLE TIMES IF FILTER MAPPED TO MULTIPLE URLS

8.5.5.1: WebSphere Application Server V8.5.5 Fix Pack 1
8.5.5.2: WebSphere Application Server V8.5.5 Fix Pack 2
8.5.5.3: WebSphere Application Server V8.5.5 Fix Pack 3
8.5.5.4: WebSphere Application Server V8.5.5 Fix Pack 4
8.5.5.5: WebSphere Application Server V8.5.5 Fix Pack 5
8.5.5.6: WebSphere Application Server V8.5.5 Fix Pack 6
8.5.5.7: WebSphere Application Server V8.5.5 Fix Pack 7
8.5.5.8: WebSphere Application Server V8.5.5 Fix Pack 8
8.5.5.9: WebSphere Application Server V8.5.5 Fix Pack 9
8.5.5.10: WebSphere Application Server V8.5.5 Fix Pack 10
8.5.5.11: WebSphere Application Server V8.5.5 Fix Pack 11
8.5.5.12: WebSphere Application Server V8.5.5 Fix Pack 12
8.5.5.13: WebSphere Application Server V8.5.5 Fix Pack 13
8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14
8.5.5.15: WebSphere Application Server V8.5.5 Fix Pack 15
8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14

APAR status

• Closed as program error.

Error description

• If the web.xml has the filter defined and its url mappings
  defined like following,
  .
  <filter>
  <filter-name>CustomRequestFilter</filter-name>
  <filter-class>com.ibm.ws.webcontainer.fvt.CustomRequestFilter</f
  ilter-class>
  </filter>
  <filter-mapping>
  <filter-name>CustomRequestFilter</filter-name>
  <url-pattern>/TestServlet</url-pattern>
  </filter-mapping>
  <filter-mapping>
  <filter-name>CustomRequestFilter</filter-name>
  <url-pattern>/customStuff/*</url-pattern>
  </filter-mapping>
  <filter-mapping>
  <filter-name>CustomRequestFilter</filter-name>
  <url-pattern>*.html</url-pattern>
  </filter-mapping>
  <filter-mapping>
  <filter-name>CustomRequestFilter</filter-name>
  <url-pattern>/customStuff/*</url-pattern>
  <url-pattern>*.html</url-pattern>
  </filter-mapping>
  .
  A request to
  ...server:port/FilterModifyRequestTestApp/customStuff/CustomPage
  .html
  .
  will add  the "CustomRequestFilter" 4 times in the FilterChain
  and then invoke 4 times before CustomPage.html is serviced.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server Liberty Profile                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: For an inbound request, the server      *
  *                      invokes the same filter multiple        *
  *                      times.                                  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When an inbound request URI maps to multiple URL filter
  mappings the filter chain will be updated with the same filter
  multiple times. This will result in the filter being invoked
  multiple times for the same URI.
  

Problem conclusion

• The WebContainer code has been updated and a filter will not
  be added if it is already present in the chain.
  
  To get this new behavior the following new WebContainer custom
  property needs to be set in the server.xml:
  
  as
  
  <webContainer denyDuplicateFilterinChain="true"/> (default
  =false)
  
  
  The fix for this APAR is currently targeted for inclusion in
  fix pack 8.5.5.1. 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 is sysrouted FROM one or more of the following:

  PM89149

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

Fix information

• Fixed component name

  LIBERTY PROFILE

• Fixed component ID

  5724J0814

Applicable component levels

• R850 PSY

     UP