Java/Eclipse on MacOSX: where is the

As I understand it, as of "Java for Mac OS X 10.6 Update 3", there are 3 places you will find Java installed on MacOS.

  • /System/Library/Frameworks/JavaVM.framework/ was the old place.
  • /System/Library/Java/JavaVirtualMachines/ is the new standard place - there you will find the new release.
  • /Library/Java/JavaVirtualMachines is for '...developer previews, and 3rd party JVMs'

Note the MacOS rule of putting Apple-supplied standard components in /System/Library and local extensions into /Library

The JDK installed by default does not now have a src.jar (although it is a JDK, so has javac etc). But if you install the 'Java Developer package' from Apple, you will get


which has src.jar under Contents/Home

So I think that the sane thing to do is install the developer package and point to it from your IDE.

Update - for "Java for Mac OS X 10.7 Update 1", having installed the developer package the source can be found at


After installing the most recent Java update you'll find src.jar under


That's where I pointed "JRE home" for Java 1.6 in Eclipse to. Everything works as expected (until now :)

This is my experience with src.jar !.

  • As mentioned earlier, you will have to sign up for the Apple developer account.(its free)

  • go to Downloads for Apple developers and then search for java.

  • I have chosen "Java for OS X 2013-005 Developer Package"
  • Once you download and install the package, you will find src.jar at /Library/Java/JavaVirtualMachines/1.6.0_65-b14-462.jdk/Contents/Home/

    Hope this helps!