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https://issues.apache.org/jira/browse/MWRAPPER-113?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benjamin Marwell resolved MWRAPPER-113.
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Resolution: Fixed
> Error and warning output goes to standard output and intermingles with Maven
> output
> -----------------------------------------------------------------------------------
>
> Key: MWRAPPER-113
> URL: https://issues.apache.org/jira/browse/MWRAPPER-113
> Project: Maven Wrapper
> Issue Type: Bug
> Components: Maven Wrapper Scripts
> Affects Versions: 3.2.0, 3.3.0
> Reporter: Ingo Karkat
> Assignee: Benjamin Marwell
> Priority: Trivial
> Labels: pull-request-available
> Fix For: 3.3.0
>
>
> Errors and warnings from the wrapper should go to standard error, so that
> those are also shown to the user when the regular Maven output is suppressed,
> redirected into a file, or captured by a script.
> For the latter use case, separation is especially critical because otherwise
> error output is mistakenly interpreted as desired Maven output (for example,
> when obtaining the list of Maven project names in the reactor with {{mvnw
> --quiet -Dexec.executable=echo
> '-Dexec.args=${project.groupId}:${project.artifactId}'
> org.codehaus.mojo:exec-maven-plugin:exec}}).
> The current wrapper scripts do this only inconsistently, and so warnings like
> {{Warning: JAVA_HOME environment variable is not set.}} are printed to stdout
> instead of stderr.
> Pull request: https://github.com/apache/maven-wrapper/pull/106
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