[jira] Commented: (MINVOKER-41) NullPointerException in InvokerMojo::runBuild in case the mvn executable is not at the expected location

["Benjamin Bentmann (JIRA)" <ji...@codehaus.org>]

    [ http://jira.codehaus.org/browse/MINVOKER-41?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=140071#action_140071 ] 

Benjamin Bentmann commented on MINVOKER-41:
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Yep, I see what you mean (Eclipse marks line 787 as a potential null pointer access). Seems like we should add a {{return}} statement to the {{catch}} block to quit the method.

Can you describe in some more detail what makes the plugin fail to locate your Maven executable? I.e. besides from the bad exception handling, is there something we could improve about the way the executable is located?

> NullPointerException in InvokerMojo::runBuild in case the mvn executable is not at the expected location
> --------------------------------------------------------------------------------------------------------
>
>                 Key: MINVOKER-41
>                 URL: http://jira.codehaus.org/browse/MINVOKER-41
>             Project: Maven 2.x Invoker Plugin
>          Issue Type: Bug
>    Affects Versions: 1.2
>         Environment: $ mvn --version
> Maven version: 2.0.8
> Java version: 1.6.0_06
> OS name: "linux" version: "2.6.24-19-generic" arch: "i386" Family: "unix"
>            Reporter: Jeremy
>
> Assume that the mvn executable cannot be found at the expected location, then InvokerMojo::runBuild throws a NullPointerException at line 787 (same line number in the trunk version). Indeed, looking at InvokerMojo.java, if an exception is catched in the try clause line 777 (from the invoker.execute method call), then "result" remains unaffected and the method call line 787 fails.
> I attach the InvokerMojo.java file as I get it from the svn repository, a "mvn -e -X install > log" file and one of the POM that triggers the problem.

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