Thanks to your suggestion Ty, I thin I have solved the problem. I
changed one old project to Java 11 and it still seems to run all right
and I don't get those errors. Apparently there is something missing or
messed up in Open JDK 8. I suspect the remaning projects will also be
all right with java 11 and will proceed along those lines.
Thanks Bayless
On 5/23/20 11:42 AM, Ty Young wrote:
On 5/13/20 9:03 AM, Bayless Kirtley wrote:
I'm still getting multiple error messages whenever I run a Java
project under Netbeans 11.1 on Linux Mint 19.3, OpenJDK 8. These are
samples of the messages.
(java:3065): GLib-GObject-WARNING **: 08:52:31.588:
../../../../gobject/gsignal.c:1253: unable to lookup signal
"window-state-event" of unloaded type 'GtkWidget'
(java:3065): GLib-GObject-CRITICAL **: 08:52:31.588:
g_signal_add_emission_hook: assertion 'signal_id > 0' failed
(java:3065): GLib-GObject-WARNING **: 08:52:33.532: invalid cast from
'GtkToplevelAccessible' to 'JawToplevel'
That last one repeats over and over. I have never knowingly used
GLib, GtkWidget or JawTopLevel. What is going on here?
Bayless
TL;DR:
Swing/AWT/JavaFX aren't magically cross-platform: they have to do
basic integration with each underlying platform's UI API.
GLib/GTKGtkWidget are a dependency/component of GTK. GTK is the major
Linux UI API used by various desktops and applications.
What seems to be happening here is that something broke in that
integration layer(bindings), which allow Java to communicate with GTK,
is broken somehow. What I don't understand is why it's only happening
when running a project, Netbeans probably shouldn't be running either.
I wonder, did you install updates without rebooting? That tends to
introduce issues like this.
Otherwise it might be Linux distros packaging something wrong, as
others have suggested. Maybe try installing and using Java 11 instead?
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