Unhandled event loop exception

Some more detailed info when starting from the command line; the error messages are repeating numerous times, but I cut them here for brevity.

***WARNING: Detected: GTK_IM_MODULE=xim. This input method is unsupported and can cause graphical issues.
***WARNING: Unset GTK_IM_MODULE or set GTK_IM_MODULE=ibus if flicking is experienced. 
 
(STM32CubeIDE:9022): GLib-CRITICAL **: 14:01:52.225: g_base64_encode_step: assertion 'in != NULL' failed
 
 
 
(STM32CubeIDE:9022): Gtk-CRITICAL **: 14:02:25.858: gtk_box_gadget_distribute: assertion 'size >= 0' failed in GtkScrollbar
 
 
 
(STM32CubeIDE:9022): Gdk-CRITICAL **: 14:02:28.017: The window 0x7f75de488af0 already has a drawing context. You cannot call gdk_window_begin_draw_frame() without calling gdk_window_end_draw_frame() first.

Doing

export GTK_IM_MODULE="ibus"

before starting stmcubeide seems to fix it...

though a lot of the error messages still happen. (the encode step and the scrollbar one)

I have been having the same Unhandled event loop exception problems. I'm running Debian 9, and getting rid of it, has been a real pain. Its related to the input ibus=xim bug

Here is a link talking about linux input handling . https://unix.stackexchange.com/questions/260601/understanding-setting-up-different-input-methods

Test with eclipse Version: 2020-06 (4.16.0) Build id: 20200615-1200 to see the problem.

It warns you about input , GTK_IM_MODULE="xim" being set, on startup (run from bash to see this startup warning)

you can use, im-config to change it, (install if you don't have ) to something else, but this dose not fix the problem!, X startup being complete abomination. It could being set in any number of other places. I removed ibus, nope, still get the warning from eclipse and the buffer flashing problem, and grep-ing all my config file's for gnome/gtk/X.. nop.. still could not find where it was being set, best I could come up with was to add this to .profile and .bash files

export GTK_IM_MODULE="gtk-im-context-simple"

export QT_IM_MODULE="simple"

This fix the problem for the moment(for me) but who knows, given the Java/Eclipse version nightmare, it may all stop working just by clicking the left mouse button at the same time your holding the Num lock key down, format your hard-disk, sign you up for a million $ loan at 200% interest , with your local shark loan organization, and then say.. Have a nice day!

Lachlan