IBM Support

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

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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 number

    PH33683

  • Reported component name

    WEBS APP SERV N

  • Reported component ID

    5724H8800

  • Reported release

    850

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2021-01-21

  • Closed date

    2021-03-25

  • Last modified date

    2021-03-31

  • 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

[{"Line of Business":{"code":"LOB36","label":"IBM Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"850"}]

Document Information

Modified date:
01 April 2021