Intellij generate javadoc for methods and classes

For IntelliJ 12:

Position caret above a method name, type /** and press Enter to let IntelliJ IDEA automatically generate JavaDoc stubs for this method. See here

For newer versions of IntelliJ (2018+), you can use this solution:

Typing /** + then pressing Enter above a method signature will create Javadoc stubs for you.

It's not possible at the moment. You may want to Vote for IDEABKL-1787.