CLONE - JAVA_HOME auto discovery - also for windows with mvn.bat
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Key: MNG-5025
URL: http://jira.codehaus.org/browse/MNG-5025
Project: Maven 2 & 3
Issue Type: Improvement
Affects Versions: 3.0.2
Environment: Linux, Ubuntu
Reporter: Jochen Stiepel
Assignee: Benjamin Bentmann
Priority: Minor
Fix For: 3.0.3
When JAVA_HOME is not set (but java command is in the PATH) then bin/mvn script
prints warning message "Warning: JAVA_HOME environment variable is not set."
I don't want to explicitly set JAVA_HOME variable because I manage my JDK
instances by update-java-alternatives in Ubuntu. It switches system wide JDK,
but does not set the JAVA_HOME variable. If I would set JAVA_HOME manually then
any changes made by update-java-alternatives would not be reflected in
JAVA_HOME which is obviously incorrect.
However mvn script can be improved, so that it can guess JAVA_HOME. Actually
Groovy startup script does it very well, so I moved auto-discovery code from
groovy script to mvn and attach patch here
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