The Perspective toolbar disappears in KDE

Question

I have an issue with the Perspective toolbar in Eclipse Neon.3 Release (4.6.3) running in Ubuntu 14.04.5:

• The toolbar is visible when I run Eclipse in Gnome
• The toolbar is not visible when I run Eclipse in KDE

In KDE, when I click Windows -> New window, the Perspective toolbar appears. But when I close all windows and start Eclipse again, the Perspective toolbar is not visible again.

I tried to remove ~/.eclipse and $WORKSPACE/.metadata. I also tried this and this, but that did not help.

What might be the reason and how to solve that?

Answer 1

I am using Eclipse Oxygen (4.7.0) with KDE on RHEL 7.2 (remotely accessed with PCoIP Agent/Client) and have also encountered this problem of the missing Perspective toolbar, along with other issues:

• Unsightly rectangular boxes around menu items.
• Unreadable dark-grey-on-black text in Editors dialog.
• Eclipse crashing when I open Window > Perspective > Customize Perspective.

While exploring solutions for an unrelated display issue, I came across a suggestion to force Eclipse to use GTK2 by defining SWT_GTK3=0 in the environment before starting eclipse (this example is for Bash):

export SWT_GTK3=0
eclipse

When I did this, not only did the Perspectives toolbar appear, it also solved all the other problems mentioned above.