在OSX上卸载JDK 8

Question

How can I cleanse my Mac of Java 8 -- jdk, not jre or plugin, which I don't care about? I need to downgrade to jdk 7. I've found docs online but they're all about the java plugin. If I try simply installing jdk 7 (on top of 8), the 8 is still there.

Answer 1

You can uninstall a JDK simply by deleting the appropriate directory under /Library/Java/JavaVirtualMachines where it is installed. But note that browsers, Java Web Start and double-clickable app bundles created with Oracle's appbundler will always use the "public JRE" under /Library/Internet Plug-Ins , and that will remain as Java 8 unless you uninstall it separately.

But you may not actually need to uninstall Java 8 - the command line tools such as java and javac respect JAVA_HOME , so you can have both versions installed side by side and pick the appropriate one with /usr/libexec/java_home :

export JAVA_HOME=`/usr/libexec/java_home -v '1.7*'`

Answer 2

On my machine, I get the following output from terminal:

> /usr/libexec/java_home -v 1.6
/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home

> /usr/libexec/java_home -v 1.7
/Library/Java/JavaVirtualMachines/jdk1.7.0_07.jdk/Contents/Home

> /usr/libexec/java_home -v 1.8
/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home

Check yours and let me know.