Is there any way to use Android Studio (not Intellij) and make it work fully with Java projects? I tried to open a Maven-based ejb project I have here but it seems that it doesn't recognize it.
I would like to use Android Studio, since my company forbids non-approved software, so I could use Android Studio (the company uses it for mobile projects) or Eclipse.
And going back to Eclipse is worse than firing.
No, you can't use Android Studio for the plain Java projects. You can use IntelliJ IDEA Community (free and open source) or IntelliJ IDEA Ultimate.
Check this page for the differences. As you are working on Java EE, consider the Ultimate version.
since my company forbids non-approved software
Ask your company to approve IntelliJ IDEA.