You can configure eclipse to show warnings for things that lack javadoc, or have javadoc that does not have all the information, or has wrong information. It can also insert templates for you to fill out.
Not quite the tool you asked for, but probably better because you won't end up with empty skeletons on methods that you missed.
You can achieve this by investigating and editing the preference page beyond the path Window > Preferences > Java > Compiler > Javadoc for your workspace. The screenshot of that preference page is below:
For further information about the items in this screen please follow the link below:
Java Compiler Javadoc Preferences Help