Jarkko Rantavuori created MNG-5756:
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Summary: Java home output in mvn -v is misleading
Key: MNG-5756
URL: https://jira.codehaus.org/browse/MNG-5756
Project: Maven
Issue Type: Improvement
Components: Command Line
Affects Versions: 3.2.5
Environment: any
Reporter: Jarkko Rantavuori
Priority: Minor
For example on my windows box, mvn -v prints the following:
`Java home: C:\Program Files (x86)\Java\jdk1.7.0_51\jre`
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:
https://git-wip-us.apache.org/repos/asf?p=maven.git;a=blob;f=maven-embedder/src/main/java/org/apache/maven/cli/CLIReportingUtils.java
{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:
http://javahowto.blogspot.fi/2006/05/javahome-vs-javahome.html
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 ${java.home} 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:
http://stackoverflow.com/questions/15279586/java-home-in-maven/15279640
http://stackoverflow.com/questions/17620531/maven-pointing-to-jre-instead-of-jdk
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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