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  1. JDK
  2. JDK-6399321

Event Handle Leak while using JNI

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    • Subcomponent:
    • Introduced In Build:
      b01
    • Introduced In Version:
    • Resolved In Build:
      b01
    • CPU:
      x86
    • OS:
      windows_2003, windows_xp

      Backports

        Description

        Short description: Event Handle Leak while using JNI

        Operating System: Microsoft Windows
        OS version: 5.2.3790
        Product Name: JRE
        Product version: java version "1.5.0_06"
                                       Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05) Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode, sharing)

        Hardware platform:
        System Manufacturer FUJITSU SIEMENS
        System Model D1899
        System Type X86-based PC

        Processor x86 Family 15 Model 4 Stepping 3 GenuineIntel ~3600 Mhz
        Processor x86 Family 15 Model 4 Stepping 3 GenuineIntel ~3600 Mhz
        Processor x86 Family 15 Model 4 Stepping 3 GenuineIntel ~3600 Mhz
        Processor x86 Family 15 Model 4 Stepping 3 GenuineIntel ~3600 Mhz
        BIOS Version/Date FUJITSU SIEMENS // Phoenix Technologies Ltd. 4.06 Rev. 1.05.1899, 6/27/2005
        Hardware Abstraction Layer Version = "5.2.3790.1830 (srv03_sp1_rtm.050324-1447)"
        Total Physical Memory 2,046.93 MB
        Available Physical Memory 1.09 GB
        Total Virtual Memory 3.39 GB
        Available Virtual Memory 2.11 GB
        Page File Space 1.54 GB
        Page File D:\pagefile.sys

        Full problem description:

        The program contains a single thread that attaches and detaches from JNI in a loop.
        The loop-count and the sleep-time in the loop can be customized via command line arguments.

        Test case:
        The test progam is JniTest.zip
        Compile and Link the Test program
        Open the Task Manager in the machine and add the column "Handle" to the list of columns displayed.

        Start the test program
        Observe the Handle count for the process JNITest.exe
        It can be observed that the Handle count increases by two for every execution of the for loop. Each execution consists of one call AttachCurrentThread and DetahCurrentThread to JVM.Open "Process Explorer" from www.sysinternals.com and observe the type of handles used by the process JNITest.exe. It can be seen that the leak happens for the type "Event".

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                Assignee:
                kevinw Kevin Walls
                Reporter:
                btellasunw Bhanu Tella (Inactive)
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