The Goldfish Chronicles » Blog Archive » OS X Java version changing script

OS X Java version changing script

May 15th, 2006 by Hen

I’m sure it’s going to hit issues somewhere, and such probably already exist, but the following seemed worth sharing for switching Java version on a Mac.

function jvm() {
    if [ -d  /System/Library/Frameworks/JavaVM.framework/Versions/$1 ]
    then
        export JAVA_HOME=/System/Library/Frameworks/JavaVM.framework/Versions/$1/Home/
        PATH=$JAVA_HOME/bin:$PATH
    else
        echo "No such JVM: $1"
    fi
}

function jvms() {
    ls -1 /System/Library/Frameworks/JavaVM.framework/Versions/ | grep '^[0-9]'
}

Usage is:

cuckoo:hen$ jvms
1.3
1.3.1
1.4
1.4.2
1.5
1.5.0
cuckoo:hen$ jvm 1.5.0
cuckoo:hen$

This entry was posted on Monday, May 15th, 2006 at 5:16 pm and is filed under Tech. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.

2 Responses to “OS X Java version changing script”

Ian Holsman Says:
May 15th, 2006 at 8:15 pm
Thanks!
I was looking for something like this so I could run opentaps on my laptop (which required 1.4.2) and solr (which needs 1.5)
Jan Mat?rne Says:
May 16th, 2006 at 12:11 am
Maybe not as dynamic as yours (and for Windows) - but used the same technique for over a year and it works well. So I could compile Ant on a 1.2 or a 1.5 base (nice to see all the 1.5-deprecated stuff which was ‘new’ in 1.2).

@echo off
set JAVA_BASE=c:\jdk
if “%1″==”help” goto help

set JHOME=%JAVA_BASE%\%1
if “%1″==”160″ set JHOME=%JAVA_BASE%\160_2004Nov
if “%1″==”150″ set JHOME=%JAVA_BASE%\150
….
if “%1″==”" set JHOME=C:\Programme\Java\j2sdk1.4.2_04
goto end

:help
echo setjava - Set the Java-Version
echo .
echo 1.4.2_04
echo 15 160 160_snap 1.6.0-Snapshot
echo 15 150 150_b2 1.5.0
…
goto end2

:end
if exist %JHOME%\bin\javac.exe goto setJavaHome
echo %JHOME%\bin\javac.exe not found. No changes done.
goto end2

:setJavaHome
set JAVA_HOME=%JHOME%
call cleanPath.pl PATH _clean_.bat -add %JAVA_HOME%\bin -del jdk
call _clean_.bat
del _clean_.bat
echo Java-Home: %JAVA_HOME%
call java -version
goto end2

:end2
set JAVA_BASE=
set JHOME=

Oh the ‘cleanPath.pl’ is a small perl skript which can add and remove entries (regexp based) from the PATH variable. Nice to clean that stuff …