Michael Osipov created MNG-6003:
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Summary: Drastically reduce JAVA_HOME discovery code
Key: MNG-6003
URL: https://issues.apache.org/jira/browse/MNG-6003
Project: Maven
Issue Type: Improvement
Components: Command Line
Affects Versions: 3.3.9
Reporter: Michael Osipov
Assignee: Michael Osipov
Fix For: 3.4.0
Our [installation documentation|https://maven.apache.org/install.html] several
times requires that {{JAVA_HOME}} is set and points to a valid JDK. Though,
tens of lines in {{mvn}} and {{mvn.cmd}} perform some magic to discover it when
it is not set. This completely contradicts our requirement that {{JAVA_HOME}}
must be set.
We can drastically reduce this code by checking if {{JAVA_HOME}} is set and use
it, if not perform {{which java}} and use that to run Maven. Not adhering to
our requirements is deemed to undefined behavior. A developer must be able to
set this simple env var properly. In most cases on Unix/Linux OpenJDK is
installed anyway which means that {{which java}} points to a JDK anyway. For
instance, the {{JAVA_HOME}} discovery on FreeBSD competely fails and sets it to
{{/usr/local}} because {{/usr/local/bin/java}} is actually a wrapper script.
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