PH33683: EJB TIMER SERVICE DOES NOT ADJUST BASED ON DAYLIGHT SAVINGS TIME ADJUSTMENT

APAR status

• Closed as program error.

Error description

• The WebSphere EJB timer service uses java.util.Calendar to
  calculate the next timeout for timers. We have become aware
  that there is a limitation in java.util.Calendar that results
  in this behavior during the fall Daylight Saving Time
  adjustment, however there is currently no fix for
  this issue.
  
  There are no known issues for the spring DST adjustment.
  
  We agree that repeating timers should continue through the
  first occurrence of the Daylight Savings Time adjustment hour.
  WebSphere should be able to work around the JDK behavior in
  Calendar.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server EJB Timers                           *
  ****************************************************************
  * PROBLEM DESCRIPTION: EJB timer not scheduled properly        *
  *                      during                                  *
  *                      daylight savings time adjustment.       *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  An EJB timer scheduled to run during a daylight savings time
  adjustment period may not run at the expected time.
  For example, an EJB timer scheduled to repeat every hour may
  skip over the first occurrence of 1 AM during the autumn
  daylight savings time adjustment when 1 AM occurs twice.
  Also, an EJB timer scheduled to repeat only at 2 AM may skip 2
  days during the spring daylight savings time adjustment when 2
  AM does not occur on one day.
  

Problem conclusion

• The WebSphere EJB timer service has been updated to properly
  account for the daylight savings time adjustment periods when
  scheduling the next timeout of a calendar based timer.
  
  The fix for this APAR is targeted for inclusion in fix packs
  8.5.5.20, 9.0.5.8, and 21.0.0.4. For more information, see
  'Recommended Updates for WebSphere Application Server':
  https://www.ibm.com/support/pages/node/715553
  

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

  WEBS APP SERV N

• Fixed component ID

  5724H8800

Applicable component levels

• R850 PSY

     UP

• R900 PSY

     UP