IBM Support

PI92331: LARGE OBJECT COM/IBM/XML/XML4J/INTERNAL/S1/UTIL/SYMBOLTABLE$ENTRY ARRAYS

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APAR status

  • Closed as program error.

Error description

  • ERROR DESCRIPTION:Ø
    SymbolTable tables are performance optimization for XML symbols
    that are re-used between XML messages. If each document
    processed by cached XML parser contains unique prefixes for
    example, the table would slowly grow until heap is under stress
    and OutOfMemory is triggered.
    

Local fix

  • Regular restarts will prevent the runtime hitting OutOfMemory
    situation.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server                                      *
    ****************************************************************
    * PROBLEM DESCRIPTION: Possible OutOfMemory (OOM) error when   *
    *                      XML SymbolTable grows too large         *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    SymbolTable tables are performance optimization for XML symbols
    that are re-used between XML messages. If each document
    processed by cached XML parser contains unique prefixes for
    example, the table would slowly grow until heap is under stress
    and OutOfMemory is triggered.
    

Problem conclusion

  • The custom system property
    "com.ibm.xml.xci.XSDGrammarResource.UseSoftReferences" was
    added to enable usage of soft
    reference SymbolTable which does not decrease memory usage but
    will enable garbage collection on less frequently used entries
    in symbol table. Defaults to false
    
    
    The fix for this APAR is currently targeted for inclusion in
    fix pack 8.5.5.15 and 9.0.0.11.  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

    PI92331

  • 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

    2018-01-11

  • Closed date

    2018-12-10

  • Last modified date

    2018-12-10

  • 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



Document information

More support for: WebSphere Application Server
General

Software version: 850

Reference #: PI92331

Modified date: 10 December 2018