GUI Designer without a .form file

This is my first time using IntelliJ IDEA (CE) and I am moving an old project over to it from Eclipse. This project uses Swing to create a GUI. However, because it was done in Eclipse, there is no `.form` file that IDEA apparently needs in order to utilize its GUI Designer.

Is there any way to somehow generate a `.form` file from the `.java` file, either in IDEA or Eclipse so that I can edit the GUI from IDEA?