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From "Stephen Connolly (JIRA)" <>
Subject [jira] [Updated] (MNG-6003) Drastically reduce JAVA_HOME discovery code
Date Mon, 09 Jan 2017 10:06:58 GMT


Stephen Connolly updated MNG-6003:
    Fix Version/s:     (was: 3.4.0)

> Drastically reduce JAVA_HOME discovery code
> -------------------------------------------
>                 Key: MNG-6003
>                 URL:
>             Project: Maven
>          Issue Type: Improvement
>          Components: Command Line
>    Affects Versions: 3.3.9
>            Reporter: Michael Osipov
>            Assignee: Michael Osipov
>             Fix For: 3.5.0
> Our [installation documentation|] 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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