IBM Support

IJ05380: JAVA.UTIL.LOGGING.LEVEL$KNOWNLEVEL HOLDING THE STRONG REFERENCES TO HASHMAP ENTERIES LEADING TO OUTOFMEMORYERROR.

Subscribe to this APAR

By subscribing, you receive periodic emails alerting you to the status of the APAR, along with a link to the fix after it becomes available. You can track this item individually or track all items by product.

Notify me when this APAR changes.

Notify me when an APAR for this component changes.

APAR status

  • Closed as program error.

Error description

  • Error Message: Dump Event "systhrow" (00040000) Detail
    "java/lang/OutOfMemoryError" "Java heap space" received
    .
    Stack Trace: N/A
    .
    Here is the path to GC root diagram produced by Memory Analyzer,
    for one of the leak suspect ClassLoader object:
    ----------------------------------------------------------------
    ------org.apache.tools.ant.loader.AntClassLoader5
    
    '- <classloader>, <classLoader> class
    com.ibm.websphere.logging.WsLevel
    '- <class> com.ibm.websphere.logging.WsLevel
    '- levelObject java.util.logging.Level$KnownLevel
    '- <OSB>175<CSB> java.lang.Object<OSB>244<CSB>
    '- elementData java.util.ArrayList
    '- value java.util.HashMap$Entry
    '- <OSB>24<CSB> java.util.HashMap$Entry<OSB>32<CSB>
    '- table java.util.HashMap
    '- nameToLevels class java.util.logging.Level$KnownLevel
    ----------------------------------------------------------------
    ------
    

Local fix

  • N/A
    

Problem summary

  • The classloaders are kept alive on the heap as they had strong
    references maintained by java.util.logging.Level$KnownLevel.
    

Problem conclusion

  • The java.util.logging.Level code has been modified to make use
    of weakreferences to avoid the OutOfMemoryError.
    .
    This APAR will be fixed in the following Java Releases:
       7    SR10 FP30 (7.0.10.30)
       7 R1 SR4 FP30  (7.1.4.30)
       8    SR5 FP20  (8.0.5.20)
    .
    Contact your IBM Product's Service Team for these Service
    Refreshes and Fix Packs.
    For those running stand-alone, information about the available
    Service Refreshes and Fix Packs can be found at:
               https://www.ibm.com/developerworks/java/jdk/
    

Temporary fix

Comments

APAR Information

  • APAR number

    IJ05380

  • Reported component name

    JAVA CLASS LIBS

  • Reported component ID

    620700130

  • Reported release

    700

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-03-30

  • Closed date

    2018-08-10

  • Last modified date

    2018-08-10

  • 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

    JAVA CLASS LIBS

  • Fixed component ID

    620700130

Applicable component levels



Document information

More support for: Runtimes for Java Technology
Java Class Libraries

Software version: 700

Reference #: IJ05380

Modified date: 10 August 2018