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From "Jim Yu (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-6303) [JDWP] Fix a potential crash problem that would happen if String object is GCed
Date Thu, 13 Aug 2009 07:34:14 GMT
[JDWP] Fix a potential crash problem that would happen if String object is GCed
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                 Key: HARMONY-6303
                 URL: https://issues.apache.org/jira/browse/HARMONY-6303
             Project: Harmony
          Issue Type: Bug
          Components: JDK
    Affects Versions: 5.0M10
            Reporter: Jim Yu
             Fix For: 5.0M11


I found there was a potential crash problem in StringReference command set, Value command.
In the statement [1] as following shows, if the string object for which we are trying to read
its ID has been GCed actually, the string ID we retrieved would be null as a result. Hence
if we pass the null value to the follwing jni invocations [2], crash would happen. The solution
is that we should return the error code to the upper level when the string object is GCed
in this case. 

[1] jstring stringObject = m_cmdParser->command.ReadStringID(jni);

[2] jsize len = jni->GetStringLength(stringObject);
     jsize utfLen = jni->GetStringUTFLength(stringObject);

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