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From "Vasily Zakharov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-2615) [drlvm][test] Stress test for massive class loading from bootclasspath
Date Tue, 12 Dec 2006 17:51:22 GMT
    [ http://issues.apache.org/jira/browse/HARMONY-2615?page=comments#action_12457822 ] 
            
Vasily Zakharov commented on HARMONY-2615:
------------------------------------------

A particular issue described above is not in fact caused by massive class loading, but by
some problems in org.mmtk.plan.Plan class itself. So, a separate issue is filed on that problem,
HARMONY-2650.


> [drlvm][test] Stress test for massive class loading from bootclasspath
> ----------------------------------------------------------------------
>
>                 Key: HARMONY-2615
>                 URL: http://issues.apache.org/jira/browse/HARMONY-2615
>             Project: Harmony
>          Issue Type: Test
>          Components: DRLVM
>            Reporter: Vasily Zakharov
>         Attachments: CrashTestBCP.java
>
>
> This is a stress test which loads all the classes it finds in VM bootclasspath using
simple Class.forName() call.
>  
> Not all of the classes are supposed to be loaded correctly this way, so the test ignores
any class loading errors - its main purpose is to make sure VM survives loading thousands
of classes without a crash. Also, investigating why particular classes fail to load may provide
clues to some other bugs in VM or classlib.
> I recommend including this test to some Harmony test suite that is run regularly, as
it may detect many VM issues that may occur in future.
> Currently this test crashes both on Windows/IA32 and Linux/IA32 in a very strange way
- at some point, unhandled exception occurs inside the catch(Throwable) block:
> 9879: org.mmtk.plan.Plan
> java.lang.ClassNotFoundException: null.Factory
>         at java.lang.Class.forName(Unknown Source)
>         at java.lang.Class.forName(Unknown Source)
>         at org.mmtk.vm.VM.<clinit>(Unknown Source)
>         at org.mmtk.utility.Constants.<clinit>(Unknown Source)
>         at org.mmtk.plan.Plan.<clinit>(Unknown Source)
>         at java.lang.VMClassRegistry.initializeClass(Native Method)
>         at java.lang.Class.forName(Unknown Source)
>         at java.lang.Class.forName(Unknown Source)
>         at CrashTestBCP.load(CrashTestBCP.java:75)
>         at CrashTestBCP.main(CrashTestBCP.java:98)

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