IV19710: RE-TRANSFORMED CLASSES ARE INCORRECTLY STORED IN SHARED CLASS CA CHE IF THE CLASS IS NOT MODIFIED BY JAVA/JVMTI AGENT

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APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
    .
    Stack Trace: N/A
    .
    

Local fix

  • Either disable shared cache using -Xshareclasses:none, or do not
    use re-transformation capable java/jvmti agents
    

Problem summary

  • Default behavior of JVM is not to store re-transformed classes
    into shared cache. However if a java/jvmti agent,while
    re-transforming classes, does not modify a class, then JVM
    deviates from the default behavior and incorrectly stores the
    class in cache. Although it will not have impact on application
    behavior, but it can result in unexpected increase in shared
    cache usage.
    Note that if the JVM is running with
    -Xshareclasses:cacheRetransformed then all re-transformed
    classes are stored in cache. In this case, JVM behaves as
    expected.
    

Problem conclusion

  • This defect will be fixed in:
    7.0.0 SR1
    6.0.1 SR2
    .
    The JVM has been updated to prevent unmodified re-transformed
    classes from being stored into the cache when not running with
    -Xshareclasses:cacheRetransformed.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV19710

  • Reported component name

    J9 COMMON CODE

  • Reported component ID

    620700127

  • Reported release

    260

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-04-13

  • Closed date

    2012-04-13

  • Last modified date

    2012-04-13

  • 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

    J9 COMMON CODE

  • Fixed component ID

    620700127

Applicable component levels

  • R260 PSY

       UP



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Document information


More support for:

Runtimes for Java Technology
Virtual Machine

Software version:

260

Reference #:

IV19710

Modified date:

2012-04-13

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