PI28751: ENHANCE THE PERFORMANCE SEARCH FOR RESOURCES IN /META-INF/RESOUR CES

8.0.0.10: WebSphere Application Server V8.0 Fix Pack 10
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
8.0.0.11: WebSphere Application Server V8.0 Fix Pack 11
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
8.0.0.12: WebSphere Application Server V8.0 Fix Pack 12
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
8.0.0.13: WebSphere Application Server V8.0 Fix Pack 13
8.5.5.12: WebSphere Application Server V8.5.5 Fix Pack 12
8.0.0.14: WebSphere Application Server V8.0 Fix Pack 14
8.5.5.13: WebSphere Application Server V8.5.5 Fix Pack 13
8.0.0.15: WebSphere Application Server V8.0 Fix Pack 15
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
8.5.5.17: WebSphere Application Server V8.5.5 Fix Pack 17
8.5.5.20: WebSphere Application Server V8.5.5.20
8.5.5.18: WebSphere Application Server V8.5.5 Fix Pack 18
8.5.5.19: WebSphere Application Server V8.5.5 Fix Pack 19
8.5.5.16: WebSphere Application Server V8.5.5 Fix Pack 16
8.5.5.21: WebSphere Application Server V8.5.5.21

APAR status

• Closed as program error.

Error description

• Enhance the performance of search for resources in
  /META-INF/resources during application startup
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  IBM WebSphere Application Server Full       *
  *                  Profile versions 8.0 and 8.5.5 users        *
  ****************************************************************
  * PROBLEM DESCRIPTION: Performance enhancement for resource    *
  *                      searching in the /META-INF/resources.   *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Starting in Servlet Specification 3.0, static and JavaServlet
  Pages (JSP) resources can be packaged under the
  /META-INF/resources folder of a jar file which is located
  under the /WEB-INF/lib.  These resources can be requested just
  like any other resources that are under the WAR root folder.
  The WebContainer searches for the requested resources at
  runtime.  The search includes a sequence of unzipping and
  searching for the resource in each /WEB-INF/lib jar file until
  the resource is found.  If there are a large number of jar
  files under the /WEB-INF/lib, this might cause a performance
  impact while searching the /META-INF/resources at runtime.
  

Problem conclusion

• The WebContainer code was modified to enhance the search
  performance for the /META-INF/resources.  During the
  application startup, the WebContainer searches for all the
  /WEB-INF/lib jars and caches the index of any
  /META-INF/resources.  This cache is not updated or refreshed
  until the application is restarted.
  
  At the time of the request, the cached index will be consulted
  to find the requested resource.
  
  Note:
  1. The new cache might consume some of the server's memory.
  The size is directly proportional to the total number of
  characters in the file name for all the /META-INF/resources
  jar.  No actual file content is cached.
  
  2. If a new /META-INF/resources jar is added dynamically, the
  application must be restarted to pick up the newly added
  resources.
  
  To disable the enhanced feature in this APAR, set the
  following WebContainer custom property:
  
  com.ibm.ws.webcontainer.searchMetaInfResourcesDuringAppStart =
  false (default is true)
  
  The fix for this APAR is currently targeted for inclusion in
  fix packs 8.0.0.10 and 8.5.5.5.  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:

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

Fix information

• Fixed component name

  WEBSPHERE APP S

• Fixed component ID

  5724J0800

Applicable component levels

• R800 PSY

     UP

• R850 PSY

     UP