PI52851: Changing JavaServer Pages (JSP) features between requests can re sult in a java.lang.NullPointerException.

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
8.5.5.17: 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

• When the jsp-2.3 feature is enabled and a JSP request is
  made, the request is successful.  However, if the server
  feature is then changed to jsp-2.2 and another request is
  made to the same JSP file a NullPointerException will occur.
  The "Caused by" exception stack is:
  Caused by: java.lang.NullPointerException
  at
  org.apache.jasper.runtime.ProtectedFunctionMapper.mapFunctio
  n(ProtectedFunctionMapper.java:148)
  at com.ibm._jsp._test.<clinit>(_test.java:90)
  at java.lang.J9VMInternals.initializeImpl(Native Method)
  at
  java.lang.J9VMInternals.initialize(J9VMInternals.java:237)
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server Liberty Profile - JavaServer Pages   *
  *                  (JSP)                                       *
  ****************************************************************
  * PROBLEM DESCRIPTION: Changing JavaServer Pages (JSP)         *
  *                      features between requests can result in *
  *                      a NullPointerException.                 *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When the jsp-2.3 feature is enabled and an initial request is
  made to a JSP file, the request is successful.  However, if the
  server feature is then changed to jsp-2.2 and another request is
  made to the same JSP file a java.lang.NullPointerException will
  occur in the "Caused by" section of the exception stack.
  An example of the exception thrown is:
  java.lang.ExceptionInInitializerError
          at
  java.lang.J9VMInternals.initialize(J9VMInternals.java:259)
          at java.lang.Class.forNameImpl(Native Method)
          at java.lang.Class.forName(Class.java:219)
          at
  com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionServletWrappe
  r._checkForTranslation(AbstractJSPExtensionServletWrapper.java:3
  65)
          at
  com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionServletWrappe
  r.checkForTranslation(AbstractJSPExtensionServletWrapper.java:25
  7)
          at
  com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionProcessor.fin
  dWrapper(AbstractJSPExtensionProcessor.java:506)
          at
  com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionProcessor.get
  ServletWrapper(AbstractJSPExtensionProcessor.java:350)
  Caused by: java.lang.NullPointerException
  	at
  org.apache.jasper.runtime.ProtectedFunctionMapper.mapFunction(Pr
  otectedFunctionMapper.java:148)
  	at com.ibm._jsp._test.<clinit>(_test.java:90)
  	at java.lang.J9VMInternals.initializeImpl(Native Method)
  	at java.lang.J9VMInternals.initialize(J9VMInternals.java:237)
  

Problem conclusion

• The JSP engine was modified to determine the JSP feature version
  a JSP file was previously compiled with and compared to the JSP
  feature version the server is currently running.  If they do not
  match then a re-translation and re-compilation will occur.
  
  The fix for this APAR is currently targeted for inclusion in fix
  pack 8.5.5.9.  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

  WAS LIBERTY COR

• Fixed component ID

  5725L2900

Applicable component levels

• R855 PSY

     UP