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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5819) Add logic to BaseTestCase to start subprocesses ready to be attached to from a Java debugger
Date Fri, 22 Jun 2012 10:35:42 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13399252#comment-13399252
] 

Knut Anders Hatlen commented on DERBY-5819:
-------------------------------------------

This sounds like useful functionality. A couple of comments:

- Maybe the properties should be prefixed with "derby.test." for consistency with the other
test properties.

- Won't this check fail with a NullPointerException if the debugSubprocesses property is not
set?

+        if (isSunJVM() && "true".equals(
+                getSystemProperty("debugSubprocesses").toLowerCase())) {

(Btw, Boolean.valueOf(String) would save you the trouble of normalizing/lowercasing the value,
and it also handles null.)
                
> Add logic to BaseTestCase to start subprocesses ready to be attached to from a Java debugger
> --------------------------------------------------------------------------------------------
>
>                 Key: DERBY-5819
>                 URL: https://issues.apache.org/jira/browse/DERBY-5819
>             Project: Derby
>          Issue Type: Improvement
>          Components: Test
>            Reporter: Dag H. Wanvik
>            Assignee: Dag H. Wanvik
>            Priority: Minor
>         Attachments: derby-5819.diff, derby-5819b.diff
>
>
> Sometimes it's useful to be able to attach to subprocesses of tests with a debugger.
> Now that we have centralized subprocess creation in BaseTestCase#execJavaCmd it would
be easy and useful to have subprocesses start, but wait for a debugger to attach to them,
i.e. with these options on an Oracle VM:
> -Xdebug -Xrunjdwp:transport=dt_socket,address=<port>,server=y,suspend=y

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