[MWRAPPER-113] Some mvnw error and warning output goes to standard output #106
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…tput Consistently redirect errors and warnings to stderr.
…go to standard output Use Write-Error instead of Write-Output in the PowerShell part. Also redirect the empty lines that surround error messages to stderr.
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bmarwell
approved these changes
Feb 5, 2024
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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.Following this checklist to help us incorporate your
contribution quickly and easily:
for the change (usually before you start working on it). Trivial changes like typos do not
require a JIRA issue. Your pull request should address just this issue, without
pulling in other changes.
[MWRAPPER-XXX] - Fixes bug in ApproximateQuantiles,where you replace
MWRAPPER-XXXwith the appropriate JIRA issue. Best practiceis to use the JIRA issue title in the pull request title and in the first line of the
commit message.
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