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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