Ingo Karkat created MWRAPPER-113:
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Summary: 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, next-release
Reporter: Ingo Karkat
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.
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