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PI93221: NULLPOINTEREXCEPTION DURING JAXB.UNMARSHAL FOR @XMLMIXED LIST

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APAR status

  • Closed as program error.

Error description

  • When a getter method has been annotated with @XmlMixed
    the code generator is assuming that the value returned from the
    getter method is always a non-null list and that is the cause
    of the NullPointerException.
    

Local fix

  • As an alternative workaround which would allow the customer to
    keep the
    JAXB optimizations enabled, the customer could modify the getter
    method
    in their application to always return a non-null list. For
    example:
    
    @XmlMixed
    public List<String> getDescription() {
        if (Description == null) {
            Description = new ArrayList<String>();
        }
        return Description;
    }
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server                                      *
    ****************************************************************
    * PROBLEM DESCRIPTION: The IBM JAXB Unmarshaller may throw a   *
    *                      NullPointerException when attempting    *
    *                      to write a value to a @XmlMixed         *
    *                      property.                               *
    ****************************************************************
    * RECOMMENDATION:  Install a fix pack that contains this       *
    *                  APAR.                                       *
    ****************************************************************
    When a getter method has been annotated with @XmlMixed the
    JAXB Unmarshaller's code generator is assuming that the value
    returned from the getter method is always a non-null list.
    When the generated code is executed at runtime a
    NullPointerException will be thrown if the list is null.
    

Problem conclusion

  • The problem was resolved by adding logic to the IBM JAXB
    Unmarshaller's code generator to generate a method for
    processing @XmlMixed that contains a null check before
    accessing the list.
    
    The fix for this APAR is currently targeted for inclusion in
    fix pack 9.0.0.8. 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 number

    PI93221

  • Reported component name

    WEBSPHERE APP S

  • Reported component ID

    5724J0800

  • Reported release

    900

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-02-01

  • Closed date

    2018-04-05

  • Last modified date

    2018-04-05

  • 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

  • R900 PSY

       UP

[{"Business Unit":{"code":"BU053","label":"Cloud \u0026 Data Platform"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"900","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
19 October 2021