I cannot inspect source code from eclipse plugin

Eclipse plugin:

What I do is this,

Attaching plugin as source:

What I do wrong, here is my eclipse info

Eclipse info:

CodePudding user response：

The "Eclipse SDK" includes source code plug-ins for all the Eclipse plug-ins. If you are using a target platform you should include this in the target platform. If you are just using the "Running Platform" as your target platform install it as part of your main Eclipse.

In the Preferences in the "Plug-in Development" page check the "Include all plug-ins from target in Java workspace scope" option. You should now be able to open any Eclipse class using the normal methods of viewing a type (such as "Open Type")