Netbeans 6.9.1 javadoc not found on mac osx 10.6.7

I have a strange problem in my Netbeans compiler. Everytime i double click on method or anything, in javadoc the following message shows up.

private class MyCanvas extends JPanel

Javadoc not found. Either Javadoc documentation for this item does not exist or you have not added specified Javadoc in the Java Platform Manager or the Library Manager.

I use Mac osx 10.6.7 and i have downloaded a new version of开发者_StackOverflow javadoc and added it from the platform manager but the problem seems to continue. What could I do here?

That is a well known issue. Try to follow this link to solve it.

Links to documentation can be found here.

I hope this helps.