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Classloader leak referenced by java.lang.invoke.ThunkTable

  • 1.  Classloader leak referenced by java.lang.invoke.ThunkTable

    Posted Thu October 06, 2022 02:41 AM
    I'm running the application below on tWASv9.

    demo_war (spring boot v2.7.3 + spring data jpa v2.7.2)

    Every time I restart the application, the application classloader is leaked with the following structure.

     
    com.ibm.ws.classloader.CompoundClassLoader @ 0x70f5e19e8 war:demo_war/demo.war
    '- <classloader>, <classLoader> class com.example.demo.EmpRepository @ 0x70b5e3910
    '- [0] java.lang.Class[2] @ 0x710990f28
    '- ptypes java.lang.invoke.MethodType @ 0x7136916b8
    '- extraObject java.lang.invoke.ThunkKeyWithObject @ 0x7109a2298
    '- key java.util.concurrent.ConcurrentHashMap$Node @ 0x710990f68
    '- [5] java.util.concurrent.ConcurrentHashMap$Node[16] @ 0x709fd4438
    '- table java.util.concurrent.ConcurrentHashMap @ 0x709fcb588
    '- tuples java.lang.invoke.ThunkTable @ 0x709a7dba8
    '- _thunkTable class java.lang.invoke.AsTypeHandle @ 0x7096d6568 System Class


    ------------------------------
    Yoshiki Yamada
    IBM Japan
    ------------------------------


  • 2.  RE: Classloader leak referenced by java.lang.invoke.ThunkTable
    Best Answer

    Posted Thu October 06, 2022 02:42 AM
    Solution:
    There is a JVM option to disable a cache in ThunkTable.

    -Dcom.ibm.jsr292.disableThunkSharing=true

    This will prevent the application class from being stored in the map of ThunkTable.


    ------------------------------
    Yoshiki Yamada
    IBM Japan
    ------------------------------

    Original Message


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