How to switch JDK version on Mac OS X

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出自：http://www.jayway.com/2014/01/15/how-to-switch-jdk-version-on-mac-os-x-maverick/

Apple decided to remove the Java Preferences application in a software update and afterwards in has been difficult to change the JDK version on Mac OS X. I especially noticed this after I installed the JDK 8 early access preview which makes some of the tips that you find on various blogs online useless. After a lot of googling I finally found a simple solution that I’d like to share.

 

What you do is to edit your ~/.bash_profile and add the following:

 

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function setjdk ( ) {    if [ $ # -ne 0 ]; then    removeFromPath '/System/Library/Frameworks/JavaVM.framework/Home/bin'    if [ - n "${JAVA_HOME+x}" ] ; then      removeFromPath $JAVA_HOME    fi    export JAVA_HOME = ` / usr / libexec / java_home - v $ @ `    export PATH = $JAVA_HOME / bin : $PATH    fi } function removeFromPath ( ) {    export PATH = $ ( echo $PATH | sed - E - e "s;:$1;;" - e "s;$1:?;;" ) } setjdk 1.7

What the script does is to first remove other JDK versions in the PATH so that they won’t interfere with our new JDK version. Then it makes some clever use of /usr/libexec/java_home which is a command that lists installed JDK versions. The -v argument tells java_home to return the path of the JDK with the supplied version, for example 1.7. We also update the PATH to point to the bin directory of the newly found JAVA_HOME directory. At the end we can simply execute the function using

 

1	setjdk 1.7

which selects the latest installed JDK version of the 1.7 branch. To select a specific version you can simply execute

 

1	setjdk 1.7.0_51

 

instead. Run /usr/libexec/java_home -h to get more details on how to choose versions.

That’s it! All credits should go to Neeme Praks and his answer on superuser.com.