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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (MNG-5756) Java home output in mvn -v is misleading
Date Fri, 12 May 2017 20:23:04 GMT


ASF GitHub Bot commented on MNG-5756:

GitHub user marcelosv opened a pull request:

    Change out JAVA_HOME. Add JRE used. JRE used print /jre and JAVA_HOMEā€¦

    I read the discursion of issue MNG-5756 and I change code out for JAVA_HOME and JRE.
    Now, print two information to JAVA.

You can merge this pull request into a Git repository by running:

    $ git pull MNG-5756-Java-home-output

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #115
commit 8c10f3addc2eb35ba61792cd97c98290334c040c
Author: Marcelo <>
Date:   2017-05-12T20:16:35Z

    Change out JAVA_HOME. Add JRE used. JRE used print /jre and JAVA_HOME  print equal var


> Java home output in mvn -v is misleading
> ----------------------------------------
>                 Key: MNG-5756
>                 URL:
>             Project: Maven
>          Issue Type: Improvement
>          Components: Command Line
>    Affects Versions: 3.2.5, 3.3.3
>         Environment: any
>            Reporter: Jarkko Rantavuori
>            Priority: Minor
> For example on my windows box, mvn -v prints the following:
> {code}
> Java home: C:\Program Files (x86)\Java\jdk1.7.0_51\jre
> {code}
> But my JAVA_HOME is actually
> {code}
> > echo %JAVA_HOME%
> C:\Program Files (x86)\Java\jdk1.7.0_51
> {code}
> In the source code, the line comes from:
> {code}
> version.append( "Java home: " ).append( System.getProperty( "java.home", "<unknown
java home>" ) ).append( ls );
> {code}
> which is using property "java.home" to fetch java home. However, "java.home" property
is not JAVA_HOME! This is explained in detail in here:
> To quote:
> {quote}
>     What's the difference between JAVA_HOME and java.home?
>     JAVA_HOME is the JDK install directory, e.g., C:\jdk5. It's meant to be set as an
environment variable and referenced in Windows batch files or Unix scripts. I always have
it in my Windows Control Panel and .tcsh files,along with other common environment variables.
Some Java applications use the name jdk.home for this purpose, which I think is a better name.
But JAVA_HOME has been used since the beginning and is now a convention.
>     java.home is the JRE install directory, e.g., C:\jdk5\jre, or C:\Program Files\Java\jre1.5.0_06.
Unlike JAVA_HOME, I never seen java.home as an environment variable. java.home is a build-in
Java system property, whose value is the JRE install directory. Since all Java system properties
are also exposed as Ant build properties, you can also use $&lcub;java.home&rcub;
in build files.
>     Would jre.home be a better name? Maybe, but I don't think Sun will change it.
> {quote}
> This is a source of constant confusion. Some stackoverflow threads to illustrate:
> The correct way to print JAVA_HOME would be to use System.getenv("JAVA_HOME"). Either
that should be used or current output should be changed so it wouldn't be so misleading.

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