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From "John H. Embretsen (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-1694) derbynet/testProperties.java hangs
Date Tue, 15 Aug 2006 15:00:14 GMT
    [ http://issues.apache.org/jira/browse/DERBY-1694?page=comments#action_12428146 ] 
John H. Embretsen commented on DERBY-1694:

Thank you for uploading the patch (derby1694diff.txt)! I spent a few minutes studying it,
along with the existing code for testProperties.java, and it looks to me that this a clear
improvement. I have not run any tests apart from testProperties.java in the DerbyNetClient
framework on Solaris 10 x86, Sun JVM 1.5. 

The only thing I would like to mention is that if this patch gets committed as is, the JavaDoc
for the execCmdDumpResults(...) method will (if I have understood the code correctly) no longer
match its behavior:

	 * Execute the given command and dump the results to standard out
	 * @param args	command and arguments
	 * @param wait  true =wait for completion
	 * @exception Exception

With the patch, if wait == false, results will *not* be dumped to standard out.

> derbynet/testProperties.java hangs
> ----------------------------------
>                 Key: DERBY-1694
>                 URL: http://issues.apache.org/jira/browse/DERBY-1694
>             Project: Derby
>          Issue Type: Bug
>          Components: Test
>    Affects Versions:
>         Environment: Windows XP  IBM 142 JRE
>            Reporter: Daniel John Debrunner
>         Attachments: derby1694diff.txt
> The testProperties.execCmd() is used to fork a JVM and not handle its
> streams. This will cause problems, as indicated by the javadoc for Process.
> "The parent process uses these streams to feed input to and get output
> from the subprocess. Because some native platforms only provide limited
> buffer size for standard input and output streams, failure to promptly
> write the input stream or read the output stream of the subprocess may
> cause the subprocess to block, and even deadlock"

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