Maven 2 & 3

Better detection of JAVA_HOME on Apple Mac OS X

Details

  • Complexity:
    Intermediate
  • Number of attachments :
    1

Description

On mac JAVA_HOME is detected by using the following code:

           if [ -z "$JAVA_VERSION" ] ; then
             JAVA_VERSION="CurrentJDK"
           else
             echo "Using Java version: $JAVA_VERSION"
           fi
           if [ -z "$JAVA_HOME" ] ; then
             JAVA_HOME=/System/Library/Frameworks/JavaVM.framework/Versions/${JAVA_VERSION}/Home
           fi

But this does not work in collaboration with Using "Java preferences" to change the actual java version to use as "CurrentJDK" does not change once you update the "java applications" order.

There is an alternative (at least on Leopard) for determining current java home that is based on Java Preferences by using an apple provided script. So, as a replacement fo rthe code above the following could be used.

           if [ -z "$JAVA_HOME" ] ; then
             JAVA_HOME=`/usr/libexec/java_home | tail -1`
           fi

Could also be taht this is teh first attempt and if fails use the current way of determining home.

Activity

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Daniel Serodio added a comment -

Yes, please apply this fix.
JAVA_HOME=`/usr/libexec/java_home` is the proper way to set JAVA_HOME on OS X. From man java_home, I don't think the | tail -1 is needed.

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Daniel Serodio added a comment - Yes, please apply this fix. JAVA_HOME=`/usr/libexec/java_home` is the proper way to set JAVA_HOME on OS X. From man java_home , I don't think the | tail -1 is needed.
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Rob Elliot added a comment -

Patch to fix java version detection on OS/X so that it uses the standard Java Preferences mechanism rather than always using Java 6.

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Rob Elliot added a comment - Patch to fix java version detection on OS/X so that it uses the standard Java Preferences mechanism rather than always using Java 6.
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Rob Elliot added a comment -

I just wasted an evening trying to establish why setting the preferred Java version to Java 7 in Mac's Java Preferences still left Maven using Java 6, due to this issue. Ant does it the right way, via /usr/libexec/java_home. Attached is a patch.

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Rob Elliot added a comment - I just wasted an evening trying to establish why setting the preferred Java version to Java 7 in Mac's Java Preferences still left Maven using Java 6, due to this issue. Ant does it the right way, via /usr/libexec/java_home. Attached is a patch.
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Tamás Cservenák added a comment - - edited

You can circumvent current maven deployments (3.0.4 inclusive) without modifying them, by adding following file in /etc/mavenrc:

JAVA_HOME=`/usr/libexec/java_home -v 1.7`

Note: this will make Maven use same Java system wide!

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Tamás Cservenák added a comment - - edited You can circumvent current maven deployments (3.0.4 inclusive) without modifying them, by adding following file in /etc/mavenrc : JAVA_HOME=`/usr/libexec/java_home -v 1.7` Note: this will make Maven use same Java system wide!
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Nikolaj Schumacher added a comment -

This should probably be revisited soon. Apple recently removed the "Java Preferences" and has everything in the system default to Java 7, if that is installed. The pre-installed version of mvn 3.0.3 also uses Java 7, but any upgrade to 3.0.4 will revert back to Java 6 due to this issue.

I assume this will surprise quite a few people and cost them time tracking it down. And the current hard-coded /System/Library path will probably break as soon as Apple drops their own JRE (which they deprecated in 2010.)

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Nikolaj Schumacher added a comment - This should probably be revisited soon. Apple recently removed the "Java Preferences" and has everything in the system default to Java 7, if that is installed. The pre-installed version of mvn 3.0.3 also uses Java 7, but any upgrade to 3.0.4 will revert back to Java 6 due to this issue. I assume this will surprise quite a few people and cost them time tracking it down. And the current hard-coded /System/Library path will probably break as soon as Apple drops their own JRE (which they deprecated in 2010.)

People

  • Assignee:
    Unassigned
    Reporter:
    Alin Dreghiciu
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Dates

  • Created:
    Updated: