This week's book giveaway is in the Programmer Certification forum. We're giving away four copies of OCP Oracle Certified Professional Java SE 11 Programmer I Study Guide: Exam 1Z0-815 and have Jeanne Boyarsky & Scott Selikoff on-line! See this thread for details.
Native linux IDE's are going to be harder to find. I know Visual Slick edit has a linux version. I bet it wouldn't be too difficult to get JCreator to work under Wine. It's not a complicated bit of code.