GEM

GEM is an ecliplse plugin.

Steps to Import:

1. Import the source code as eclipse plugin.
2. pass -pythonPath e.g. /usr/local/bin/python
3. Run as ecliplse application.

Steps to Generate Refactorings:

1. Open any Java file in the eclipse IDE.
2. Text select the method name for which you want to generate extract method refactorings and press CMD/Win+6.
3. Now open the Results view to see the top-5 refactoring candidates.
4. Click on each row in the results table to view the candidate in the Java file.

This is an Example: