this is my problem.
I have a .jar file, I need to create a new java proyect (eclipse) whit this jar. I need to convert .class to .java and create the proyect to obtein the code.
For convert .class to .java I have JAD. but, I don't know how can I create a proyect whit packages etc.
Packages are nothing but directories into which your source files are organized. After you de-compiled, did you get the directories with source files?
PS. If you are going to de-compile, it might be a very good idea to see if you are allowed to do so. The license agreement/file will have information about this.