JDeodorant employs a variety of novel methods and techniques in order to identify code smells and suggest the appropriate refactorings that resolve them.
Currently, the tool identifies four kinds of bad smells, namely "Feature Envy", "State Checking", "Long Method" and "God Class".

"Feature Envy" problems are resolved by applying appropriate Move Method refactorings.
"State Checking" problems are resolved by applying Replace Conditional with Polymorphism and Replace Type code with State/Strategy refactorings.
"Long Method" problems are resolved by applying appropriate Extract Method refactorings.
Finally, "God Class" problems are resolved by applying appropriate Extract Class refactorings.

In this website, you can find a short description about the approach followed for the identification of the bad smells.
The tool is available for download and a user manual is also provided.
You can find more information about the development team and the related publications.
Finally, you can keep up with the research and development news related with JDeodorant.