PI41465: When HttpInputStream.isReady() is called after that same API has already returned false, an IllegalStateException can occur.

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
8.5.5.17: 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 HttpInputStream.isReady() is called after that same API
  has already returned false, an IllegalStateException can
  occur. This can be avoided by not calling isReady() after it
  has already returned false.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  Users of IBM WebSphere Application Server   *
  *                  Liberty Profile using a Servlet 3.1         *
  *                  javax.servlet.ReadListener                  *
  ****************************************************************
  * PROBLEM DESCRIPTION: An IllegalStateException can occur when *
  *                      the                                     *
  *                      javax.servlet.ServletInputStream.isRead *
  *                      y() method is called                    *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When the javax.servlet.ServletInputStream.isReady() method is
  called an IllegalStateException can occur. The exception occurs
  when the ServletInputStream.isReady() method has already
  returned false and then the javax.servlet.ReadListener.isReady()
  method is called again. The calls into ReadListener.isReady()
  have to occur within the same ReadListener.onDataAvailable()
  call.
  

Problem conclusion

• The javax.servlet.ReadListener WebContainer code was modified to
  not throw an IllegalStateException
  
  The fix for this APAR is currently targeted for inclusion in fix
  pack 8.5.5.6.  Please refer to the Recommended Updates page for
  delivery information:
  http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
  

Temporary fix

• Do not call  javax.servlet.ServletInputStream.isReady() after it
  has already returned false within the call to
  javax.servlet.ReadListener.onDataAvailable()
  

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

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