How to get rid of GTK3 errors when using eclipse

When I was trying to use eclipse on Fedora 26 I faced many errors related to GTK 3. Following are some of the errors I saw. These were observed in Mars2, Oxygen and also in Neon.

(Eclipse:11437): Gtk-WARNING **: Allocating size to SwtFixed 0x7fef3992f2d0 without calling gtk_widget_get_preferred_width/height(). How does the code know the size to allocate?

(Eclipse:13633): Gtk-WARNING **: Negative content width -1 (allocation 1, extents 1x1) while allocating gadget (node trough, owner GtkProgressBar)

(Eclipse:13795): Gtk-WARNING **: Negative content width -1 (allocation 1, extents 1x1) while allocating gadget (node trough, owner GtkProgressBar)


(Eclipse:13795): Gtk-CRITICAL **: gtk_distribute_natural_allocation: assertion 'extra_space >= 0' failed

All above issues are caused by GTK 3. So as a solution for this issues what we can do is force eclipse to use GTK2. Following is how you can do this.

To force GTK2, simply export the following environment variable.

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#Export Following export SWT_GTK3=0 #Start Eclipse using the same terminal session ./eclipse

Note : Make sure you start eclipse in the same terminal session where the Exported sys variable is visible to eclipse.

If you want to force eclipse to use GTK3 you can simply change the variable as follows SWT_GTK3=1

Thanks for reading and please drop a comment if you have any queries.