in my case, the original project was build in netbeans and in the last version of our app we tried to use intellij by created new project with same name and replace some folder from netbeans to intellij like "src" ,"res" ,"lib", "settings file (hints)","native" and project work for all things as fine.
but gui builder have some isuess and its not like gui builder in netbeans:
1) cann't open .gui file that generated in netbeans
2) cann't change place of component after drag and drop.