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From "Xiao-Feng Li (JIRA)" <j...@apache.org>
Subject [jira] Closed: (HARMONY-3952) [drlvm][kernel] java.lang.ThreadGroup should check if a thread is NULL before calling its method
Date Fri, 25 May 2007 04:26:16 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-3952?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Xiao-Feng Li closed HARMONY-3952.

    Resolution: Fixed
      Assignee: Xiao-Feng Li

HARMONY-3883 is fixed correctly finally. Now this issue is no longer existent.

> [drlvm][kernel] java.lang.ThreadGroup should check if a thread is NULL before calling
its method
> ------------------------------------------------------------------------------------------------
>                 Key: HARMONY-3952
>                 URL: https://issues.apache.org/jira/browse/HARMONY-3952
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>         Environment: all
>            Reporter: Xiao-Feng Li
>         Assigned To: Xiao-Feng Li
> java.lang.ThreadTest.testGetAllStackTraces failed with a NullPointerException. The following
is the log:
> Test: testGetAllStackTraces
> Class: java.lang.ThreadTest
> java.lang.NullPointerException
>  at java.lang.ThreadGroup.activeCount(ThreadGroup.java:130)
>  at java.lang.ThreadGroup.activeCount(ThreadGroup.java:136)
>  at java.lang.Thread.getAllStackTraces(Thread.java:447)
>  at java.lang.ThreadTest.testGetAllStackTraces(ThreadTest.java:1011)
>  at java.lang.reflect.VMReflection.invokeMethod(VMReflection.java)
>  at java.lang.reflect.Method.invoke(Method.java:382)
>  at junit.framework.TestCase.runTest(TestCase.java:164)
>  at junit.framework.TestCase.runBare(TestCase.java:130)
>  at junit.framework.TestResult$1.protect(TestResult.java:106)
>  at junit.framework.TestResult.runProtected(TestResult.java:124)
>  at junit.framework.TestResult.run(TestResult.java:109)
>  at junit.framework.TestCase.run(TestCase.java:120)
>  at junit.framework.TestSuite.runTest(TestSuite.java:230)
>  at junit.framework.TestSuite.run(TestSuite.java:225)
>  at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:297)
>  at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:672)
>  at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:546)
> The reason is, the thread object enumerated from WeakhashMap might be null. We should
have a null check before invoking its method. This is the conclusion we made in the discussion
of HARMONY-3883.
> I found there are more than one place in ThreadGroup that have the similar code needing

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