In Kubuntu 13.10 Java applications seemed to crash at start up with the following error:
# A fatal error has been detected by the Java Runtime Environment:
# SIGSEGV (0xb) at pc=0x00007f8f34cb9b3c, pid=25450, tid=140253340165888
# JRE version: Java(TM) SE Runtime Environment (7.0_45-b18) (build 1.7.0_45-b18)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (24.45-b08 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# C [libgobject-2.0.so.0+0x31b3c] g_type_check_instance_is_a+0x3c
The same error occurred regardless of the Java Runtime Environment installed. Some GTK applications are also affected.
As mentioned (and in many other bugs) this is related to the KDE oxygen-gtk theme.
In System Settings -> Application Appearance -> GTK change GTK2 and GTK3 themes to something else than oxygen-gtk.