The following test case causes a crash in the GTK peers:

import java.awt.*;

public class ButtonTest
{
  public static void main(String[] args)
  {
    Frame f = new Frame("Test");
    f.setSize(200, 200);
    f.add(new Button());
    f.setVisible(true);
  }
}

$ gij Text
Aborted

0x010275b1 in _Jv_JNI_GetField<jint> (env=0xa12f3c0, obj=0x0, field=0xa12f3c0)
    at ../../../libjava/jni.cc:1150
1150      return wrap_value (env, *ptr);
(gdb) bt
#0  0x010275b1 in _Jv_JNI_GetField<jint> (env=0xa12f3c0, obj=0x0, 
    field=0xa12f3c0) at ../../../libjava/jni.cc:1150
#1  0x00547bf9 in get_state (env=0xa12f3c0, obj=0x0, table=0xa027348)
    at ../../../libjava/jni/classpath/native_state.c:229
#2  0x0053aea5 in Java_gnu_java_awt_peer_gtk_GtkComponentPeer_set__Ljava_lang_St
ring_2Ljava_lang_Object_2 (env=0xa12f3c0, obj1=0x0, jname=0xa0f7540, obj2=0x0)
    at ../../../libjava/jni/gtk-peer/gnu_java_awt_peer_gtk_GtkComponentPeer.c:10
43
#3  0x0052a95e in gnu.java.awt.peer.gtk.GtkComponentPeer.set(java.lang.String, j
ava.lang.Object) (this=0x0, name=0x0, value=0x0)
    at ../../../libjava/gnu/java/awt/peer/gtk/GtkComponentPeer.java:516
#4  0x0052aa27 in gnu.java.awt.peer.gtk.GtkComponentPeer.set(gnu.java.awt.peer.g
tk.GtkArg) (this=0xa0f4420, arg=0xa10a7a0)
    at ../../../libjava/gnu/java/awt/peer/gtk/GtkComponentPeer.java:552
#5  0x005260c2 in gnu.java.awt.peer.gtk.GtkArgList.setArgs(gnu.java.awt.peer.gtk
.GtkComponentPeer) (this=0xa0f43f0, cp=0xa0f4420)
    at ../../../libjava/gnu/java/awt/peer/gtk/GtkArgList.java:72
#6  0x00529080 in gnu.java.awt.peer.gtk.GtkComponentPeer.GtkComponentPeer(java.a
wt.Component) (this=0xa0f4420, awtComponent=0xa153ed8)
....