Eclipse not working in 16.04

I had something the same with 16.04 and Eclipse Mars. I thought it had frozen but in fact it was running very, very slowly. The problem is the version of GTK+ 3, shipped with 16.04. Fortunately the solution is very easy. Open a terminal and then type export SWT_GTK3=0, then start Eclipse from the terminal. If that works, then a more persistent fix is to put the 2 lines below, as they appear in your eclipse.ini:

--launcher.GTK_version
2

before the line:

--launcher.appendVmargs

The bug is filed with Ubuntu at bug 1552764

Thanks for the tip.

I had to change required version of java from :

-Dosgi.requiredJavaVersion=1.7

into

-Dosgi.requiredJavaVersion=1.8

and remove this line as well :

-XX:MaxPermSize=256m

Happy coding !

Edit eclipse.desktop as following:

Exec=env SWT_GTK3=0 eclipse

My recomendation is that you install Eclipse Mars from the webpage: http://www.eclipse.org/downloads/index-developer.php?release=mars

But first you have to install java8 (not java9 because Eclipse Mars doesn't work with that version). In Ubuntu you can do this with: sudo apt-get install openjdk-8-jre openjdk-8-jdk

And then .. and just if you have other java version, you have to select java8 with this command: sudo update-alternatives --config java

Voilà! That worked for me! :)