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https://jira.codehaus.org/browse/MEXEC-108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=292372#comment-292372
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Robert Scholte commented on MEXEC-108:
--------------------------------------
Which version of Maven are you using? My guess would be 2.x. Here Plexus is
responsible for translating the pom.xml to a Maven Project Model. And it is a
known issue is has trouble with empty tags. I've seen some better results with
Guice, as used by Maven 3.
Since this can't just be fixed in Maven 2 we might try to prevent this issue
within the exec-maven-plugin.
> NPE at EnvironmentUtils.toStrings()
> -----------------------------------
>
> Key: MEXEC-108
> URL: https://jira.codehaus.org/browse/MEXEC-108
> Project: Maven 2.x Exec Plugin
> Issue Type: Bug
> Components: exec
> Environment: Ubuntu 10.04
> Reporter: Gili
> Attachments: mavenproject1.zip
>
>
> ProcessBuilder.environment() may contain keys with a null value. In my case
> "INSIDE_NAUTILUS_PYTHON=" was defined. If maven-exec-plugin is invoked with
> the same environment variables, the following exception is thrown:
> {code}
> java.lang.NullPointerException
> at
> org.apache.commons.exec.environment.EnvironmentUtils.toStrings(EnvironmentUtils.java:66)
> at
> org.apache.commons.exec.launcher.Java13CommandLauncher.exec(Java13CommandLauncher.java:56)
> at
> org.apache.commons.exec.DefaultExecutor.launch(DefaultExecutor.java:254)
> at
> org.apache.commons.exec.DefaultExecutor.executeInternal(DefaultExecutor.java:319)
> at
> org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:160)
> at org.codehaus.mojo.exec.ExecMojo.executeCommandLine(ExecMojo.java:610)
> at org.codehaus.mojo.exec.ExecMojo.execute(ExecMojo.java:352)
> {code}
> Expected behavior: EnvironmentUtils.toStrings() should be able to handle the
> Map returned by ProcessBuilder with the same interpretation as it treats null
> keys and values.
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