IBM Support

IV98370: PERFORMANCE DEGRADATION WHILE LOADING CLASSES USING JAVA.NET.URLCLASSLOADER AFTER MIGRATING TO IBM JDK 7 AND ABOVE

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APAR status

  • Closed as program error.

Error description

  • Error Message: Performance degradation after migrating to Java 7
    and above.
    .
    Stack Trace: N/A
    .
    

Local fix

Problem summary

  • The problem is caused when classes are loaded using
    java.net.URLClassLoader which use sun.misc.URLClassPath where
    cache is disabled that results in jar files being opened/closed
    large number of times.
    

Problem conclusion

  • The JVM has been modified to avoid closing/opening jar files on
    classpath multiple times.
    .
    This APAR will be fixed in the following Java Releases:
       7    SR10 FP10 (7.0.10.10)
       7 R1 SR4 FP10  (7.1.4.10)
       8    SR4 FP10  (8.0.4.10)
    .
    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

    IV98370

  • 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

    2017-07-24

  • Closed date

    2017-07-24

  • Last modified date

    2017-07-24

  • 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

  • R700 PSY

       UP

  • R800 PSY

       UP



Document information

More support for: Runtimes for Java Technology
Java Class Libraries

Software version: 700

Reference #: IV98370

Modified date: 24 July 2017