Description of problem:
jEdit and icedtea-web, when using the GTK look and feel, hangs in xcb while waiting for the _XReply message.

Version-Release number of selected component (if applicable):
java-1.7.0-openjdk.x86_64                           1:1.7.0.60-2.4.5.1.fc20

How reproducible:
Nearly always. jEdit sometime comes up with the GTK look&feel.

Steps to Reproduce:
1. change jEdit look and feel to GTK
2. start jEdit with "java -ea -jar /your-path-to-jedit/jedit.jar"
3. see jedit hang

Additional info:
xtrace (http://xtrace.alioth.debian.org/ which btw would be great if someone package this for Fedora...) reveals that java opens four connections to the X server:

1. connection:
#0  0x0000003623aea9dd in poll () from /lib64/libc.so.6
#1  0x000000362720b99a in poll (__timeout=-1, __nfds=1, __fds=0x7f1caac750d0)
    at /usr/include/bits/poll2.h:46
#2  read_block (len=8, buf=0x7f1ca41a4930, fd=8) at xcb_in.c:291
#3  _xcb_in_read_block (c=c@entry=0x7f1ca4191fb0, buf=<optimized out>, len=len@entry=8)
    at xcb_in.c:695
#4  0x0000003627209d93 in read_setup (c=0x7f1ca4191fb0) at xcb_conn.c:148
#5  xcb_connect_to_fd (fd=fd@entry=8, auth_info=auth_info@entry=0x7f1caac75200)
    at xcb_conn.c:297
#6  0x000000362720cd63 in xcb_connect_to_display_with_auth_info (
    displayname=displayname@entry=0x0, auth=auth@entry=0x0, screenp=screenp@entry=0x0)
    at xcb_util.c:463
#7  0x000000362720ce3a in xcb_connect (displayname=displayname@entry=0x0, 
    screenp=screenp@entry=0x0) at xcb_util.c:421
#8  0x0000003626e41dba in _XConnectXCB (dpy=dpy@entry=0x7f1ca41a8fc0, 
    display=display@entry=0x0, screenp=screenp@entry=0x7f1caac7534c) at xcb_disp.c:78
#9  0x0000003626e32c72 in XOpenDisplay (display=0x0) at OpenDis.c:129
#10 0x00007f1ca8b1c0ac in awt_init_Display ()
   from /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.60-2.4.5.1.fc20.x86_64/jre/lib/amd64/xawt/libmawt.so
#11 0x00007f1ca101304c in ?? ()
#12 0x00007f1cfffffffe in ?? ()
#13 0x00007f1caac75518 in ?? ()
#14 0x00000007f5ee4970 in ?? ()
#15 0x00007f1caac75578 in ?? ()
#16 0x00000007f5ee93c0 in ?? ()
#17 0x0000000000000000 in ?? ()

2. connection:
#0  0x0000003623aea9dd in poll () from /lib64/libc.so.6
#1  0x000000362720b99a in poll (__timeout=-1, __nfds=1, __fds=0x7fd32db8d940)
    at /usr/include/bits/poll2.h:46
#2  read_block (len=8, buf=0x7fd314001f70, fd=20) at xcb_in.c:291
#3  _xcb_in_read_block (c=c@entry=0x7fd314003f70, buf=<optimized out>, len=len@entry=8)
    at xcb_in.c:695
#4  0x0000003627209d93 in read_setup (c=0x7fd314003f70) at xcb_conn.c:148
#5  xcb_connect_to_fd (fd=fd@entry=20, auth_info=auth_info@entry=0x7fd32db8da70)
    at xcb_conn.c:297
#6  0x000000362720cd63 in xcb_connect_to_display_with_auth_info (
    displayname=displayname@entry=0x7fd314002a80 ":9", auth=auth@entry=0x0, 
    screenp=screenp@entry=0x0) at xcb_util.c:463
#7  0x000000362720ce3a in xcb_connect (displayname=displayname@entry=0x7fd314002a80 ":9", 
    screenp=screenp@entry=0x0) at xcb_util.c:421
#8  0x0000003626e41dba in _XConnectXCB (dpy=dpy@entry=0x7fd314002d20, 
    display=display@entry=0x7fd314002a80 ":9", screenp=screenp@entry=0x7fd32db8dbbc)
    at xcb_disp.c:78
#9  0x0000003626e32c72 in XOpenDisplay (display=0x7fd314002a80 ":9") at OpenDis.c:129
#10 0x0000003638a17b8d in atspi_get_a11y_bus () from /lib64/libatspi.so.0
#11 0x000000363760c434 in atk_bridge_adaptor_init () from /lib64/libatk-bridge-2.0.so.0
#12 0x00007fd32e5c899d in gnome_accessibility_module_init ()
   from /usr/lib64/gtk-2.0/modules/libatk-bridge.so
#13 0x00007fd32ea1ec21 in jaw_load_atk_bridge ()
   from /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.60-2.4.5.1.fc20.x86_64/jre/lib/amd64/libatk-wrapper.so
#14 0x00000036266492a6 in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#15 0x0000003626649628 in g_main_context_iterate.isra.24 () from /lib64/libglib-2.0.so.0
#16 0x0000003626649a3a in g_main_loop_run () from /lib64/libglib-2.0.so.0
#17 0x00007fd32ea1dbb9 in jni_main_loop ()
   from /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.60-2.4.5.1.fc20.x86_64/jre/lib/amd64/libatk-wrapper.so
#18 0x000000362666ea45 in g_thread_proxy () from /lib64/libglib-2.0.so.0
#19 0x0000003624607f33 in start_thread () from /lib64/libpthread.so.0
#20 0x0000003623af4ded in clone () from /lib64/libc.so.6

3. connection:
#0  0x0000003623aea9dd in poll () from /lib64/libc.so.6
#1  0x000000362720b99a in poll (__timeout=-1, __nfds=1, __fds=0x7fb94dad7940)
    at /usr/include/bits/poll2.h:46
#2  read_block (len=8, buf=0x7fb95c0024e0, fd=19) at xcb_in.c:291
#3  _xcb_in_read_block (c=c@entry=0x7fb95c003bf0, buf=<optimized out>, len=len@entry=8)
    at xcb_in.c:695
#4  0x0000003627209d93 in read_setup (c=0x7fb95c003bf0) at xcb_conn.c:148
#5  xcb_connect_to_fd (fd=fd@entry=19, auth_info=auth_info@entry=0x7fb94dad7a70)
    at xcb_conn.c:297
#6  0x000000362720cd63 in xcb_connect_to_display_with_auth_info (
    displayname=displayname@entry=0x7fb95c002700 ":9", auth=auth@entry=0x0, 
    screenp=screenp@entry=0x0) at xcb_util.c:463
#7  0x000000362720ce3a in xcb_connect (displayname=displayname@entry=0x7fb95c002700 ":9", 
    screenp=screenp@entry=0x0) at xcb_util.c:421
#8  0x0000003626e41dba in _XConnectXCB (dpy=dpy@entry=0x7fb95c0029a0, 
    display=display@entry=0x7fb95c002700 ":9", screenp=screenp@entry=0x7fb94dad7bbc)
    at xcb_disp.c:78
#9  0x0000003626e32c72 in XOpenDisplay (display=0x7fb95c002700 ":9") at OpenDis.c:129
#10 0x0000003638a17b8d in atspi_get_a11y_bus () from /lib64/libatspi.so.0
#11 0x000000363760c434 in atk_bridge_adaptor_init () from /lib64/libatk-bridge-2.0.so.0
#12 0x00007fb96821c99d in gnome_accessibility_module_init ()
   from /usr/lib64/gtk-2.0/modules/libatk-bridge.so
#13 0x00007fb968672c21 in jaw_load_atk_bridge ()
   from /usr/lib64/java-atk-wrapper/libatk-wrapper.so.0.0.18
#14 0x00000036266492a6 in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#15 0x0000003626649628 in g_main_context_iterate.isra.24 () from /lib64/libglib-2.0.so.0
#16 0x0000003626649a3a in g_main_loop_run () from /lib64/libglib-2.0.so.0
#17 0x00007fb968671bb9 in jni_main_loop ()
   from /usr/lib64/java-atk-wrapper/libatk-wrapper.so.0.0.18
#18 0x000000362666ea45 in g_thread_proxy () from /lib64/libglib-2.0.so.0
#19 0x0000003624607f33 in start_thread () from /lib64/libpthread.so.0
#20 0x0000003623af4ded in clone () from /lib64/libc.so.6

4. connection:
#0  0x0000003623aea9dd in poll () from /lib64/libc.so.6
#1  0x000000362720b99a in poll (__timeout=-1, __nfds=1, __fds=0x7fb968219320)
    at /usr/include/bits/poll2.h:46
#2  read_block (len=8, buf=0x7fb94803bf60, fd=25) at xcb_in.c:291
#3  _xcb_in_read_block (c=c@entry=0x7fb948042ac0, buf=<optimized out>, len=len@entry=8)
    at xcb_in.c:695
#4  0x0000003627209d93 in read_setup (c=0x7fb948042ac0) at xcb_conn.c:148
#5  xcb_connect_to_fd (fd=fd@entry=25, auth_info=auth_info@entry=0x7fb968219450)
    at xcb_conn.c:297
#6  0x000000362720cd63 in xcb_connect_to_display_with_auth_info (
    displayname=displayname@entry=0x0, auth=auth@entry=0x0, screenp=screenp@entry=0x0)
    at xcb_util.c:463
#7  0x000000362720ce3a in xcb_connect (displayname=displayname@entry=0x0, 
    screenp=screenp@entry=0x0) at xcb_util.c:421
#8  0x0000003626e41dba in _XConnectXCB (dpy=dpy@entry=0x7fb94803cc00, 
    display=display@entry=0x0, screenp=screenp@entry=0x7fb96821959c) at xcb_disp.c:78
#9  0x0000003626e32c72 in XOpenDisplay (display=0x0) at OpenDis.c:129
#10 0x0000003061451239 in IA__gdk_display_open (display_name=<optimized out>)
    at gdkdisplay-x11.c:166
#11 0x000000306141f03d in IA__gdk_display_open_default_libgtk_only () at gdk.c:324
#12 0x0000003061945aa4 in IA__gtk_init_check (argc=<optimized out>, argv=<optimized out>)
    at gtkmain.c:995
#13 0x00007fb968b1e3c1 in gtk2_load ()
   from /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.60-2.4.5.1.fc20.x86_64/jre/lib/amd64/xawt/libmawt.so
#14 0x00007fb968b06c6b in Java_sun_awt_UNIXToolkit_load_1gtk ()
   from /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.60-2.4.5.1.fc20.x86_64/jre/lib/amd64/xawt/libmawt.so
#15 0x00007fb96101304c in ?? ()
#16 0x00007fb9682197f0 in ?? ()
#17 0x00000007f5e98a08 in ?? ()
#18 0x00007fb968219848 in ?? ()
#19 0x00000007f5ead128 in ?? ()
#20 0x0000000000000000 in ?? ()

The hang occurs in a thread like this:
#0  0x0000003623aea9dd in poll () from /lib64/libc.so.6
#1  0x0000003627209f72 in poll (__timeout=-1, __nfds=1, __fds=0x7f84481d4650)
    at /usr/include/bits/poll2.h:46
#2  _xcb_conn_wait (c=c@entry=0x7f844c390c30, cond=cond@entry=0x7f84481d46d0, 
    vector=vector@entry=0x0, count=count@entry=0x0) at xcb_conn.c:414
#3  0x000000362720b44f in wait_for_reply (c=c@entry=0x7f844c390c30, request=123, 
    e=e@entry=0x7f84481d4790) at xcb_in.c:399
#4  0x000000362720b562 in xcb_wait_for_reply (c=c@entry=0x7f844c390c30, request=123, 
    e=e@entry=0x7f84481d4790) at xcb_in.c:429
#5  0x0000003626e43017 in _XReply (dpy=dpy@entry=0x7f844c37e8a0, 
    rep=rep@entry=0x7f84481d4870, extra=extra@entry=0, discard=discard@entry=0)
    at xcb_io.c:602
#6  0x000000362d607049 in XRenderQueryFormats (dpy=dpy@entry=0x7f844c37e8a0) at Xrender.c:442
#7  0x000000362d60760f in XRenderQueryVersion (dpy=0x7f844c37e8a0, 
    major_versionp=0x7f84481d4920, minor_versionp=0x7f84481d4924) at Xrender.c:333
#8  0x000000362f60462b in _XcursorGetDisplayInfo () from /lib64/libXcursor.so.1
#9  0x000000362f604939 in XcursorGetTheme () from /lib64/libXcursor.so.1
#10 0x000000306145054f in IA__gdk_x11_display_set_cursor_theme (display=0x7f844c37e8a0, 
    theme=0x7f844c3b1250 "Adwaita", size=18) at gdkcursor-x11.c:648
#11 0x00000030619babbc in settings_update_cursor_theme (
    settings=settings@entry=0x7f844c219e80) at gtksettings.c:2256
#12 0x00000030619bbd78 in gtk_settings_notify (object=0x7f844c219e80, pspec=0x7f844c39c540)
    at gtksettings.c:1427
#13 0x0000003627e10298 in g_closure_invoke () from /lib64/libgobject-2.0.so.0
#14 0x0000003627e21b87 in signal_emit_unlocked_R () from /lib64/libgobject-2.0.so.0
#15 0x0000003627e2a0f2 in g_signal_emit_valist () from /lib64/libgobject-2.0.so.0
#16 0x0000003627e2a3af in g_signal_emit () from /lib64/libgobject-2.0.so.0
#17 0x0000003627e14945 in g_object_dispatch_properties_changed ()
   from /lib64/libgobject-2.0.so.0
#18 0x0000003627e17019 in g_object_notify () from /lib64/libgobject-2.0.so.0
#19 0x00000030619bc831 in apply_queued_setting (data=0x7f844c219e80, pspec=<optimized out>, 
    qvalue=0x7f844c3156d0) at gtksettings.c:1519
#20 0x000000306199a7cc in gtk_rc_parse_statement (scanner=0x7f844c3ad6f0, 
    context=0x7f844c3ae470) at gtkrc.c:2966
#21 gtk_rc_parse_any (context=context@entry=0x7f844c3ae470, 
    input_name=input_name@entry=0x7f844c37ba90 "/usr/share/gtk-2.0/gtkrc", 
    input_fd=input_fd@entry=26, input_string=input_string@entry=0x0) at gtkrc.c:2275
#22 0x000000306199bbb5 in gtk_rc_context_parse_one_file (
    context=context@entry=0x7f844c3ae470, 
    filename=filename@entry=0x7f844c37ba90 "/usr/share/gtk-2.0/gtkrc", 
    priority=priority@entry=12, reload=reload@entry=0) at gtkrc.c:1033
#23 0x000000306199bd6f in gtk_rc_context_parse_file (context=context@entry=0x7f844c3ae470, 
    filename=0x7f844c37ba90 "/usr/share/gtk-2.0/gtkrc", priority=priority@entry=12, 
    reload=reload@entry=0) at gtkrc.c:1099
#24 0x000000306199c60f in gtk_rc_parse_default_files (context=0x7f844c3ae470) at gtkrc.c:862
#25 IA__gtk_rc_reparse_all_for_settings (settings=settings@entry=0x7f844c219e80, 
    force_load=force_load@entry=1) at gtkrc.c:1809
#26 0x00000030619bbfa7 in IA__gtk_settings_get_for_screen (
    screen=screen@entry=0x7f844c39c9b0) at gtksettings.c:1254
#27 0x0000003061963201 in display_opened_cb (display_manager=<optimized out>, 
    display=0x7f844c39a030) at gtkmodules.c:498
#28 0x0000003627e1359b in g_cclosure_marshal_VOID__OBJECTv () from /lib64/libgobject-2.0.so.0
#29 0x0000003627e104c7 in _g_closure_invoke_va () from /lib64/libgobject-2.0.so.0
#30 0x0000003627e29749 in g_signal_emit_valist () from /lib64/libgobject-2.0.so.0
#31 0x0000003627e2a8f8 in g_signal_emit_by_name () from /lib64/libgobject-2.0.so.0
#32 0x000000306145173f in IA__gdk_display_open (display_name=<optimized out>)
    at gdkdisplay-x11.c:407
#33 0x000000306141f03d in IA__gdk_display_open_default_libgtk_only () at gdk.c:324
#34 0x0000003061945aa4 in IA__gtk_init_check (argc=<optimized out>, argv=<optimized out>)
    at gtkmain.c:995
#35 0x00007f8450d4e3c1 in gtk2_load ()
   from /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.60-2.4.5.1.fc20.x86_64/jre/lib/amd64/xawt/libmawt.so
#36 0x00007f8450d36c6b in Java_sun_awt_UNIXToolkit_load_1gtk ()
   from /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.60-2.4.5.1.fc20.x86_64/jre/lib/amd64/xawt/libmawt.so
#37 0x00007f844901304c in ?? ()
#38 0x00007f84481d57f0 in ?? ()
#39 0x00000007f5e98a08 in ?? ()
#40 0x00007f84481d5848 in ?? ()
#41 0x00000007f5ead128 in ?? ()
#42 0x0000000000000000 in ?? ()

xtrace show this:
003:<:0077:  8: XInputExtension-Request(131,3): OpenDevice device=0x0a
003:>:0077:40: Reply to OpenDevice: classes={class=button(0x01) event type base=0x45},{class=valuator(0x02) event type base=0x47},{class=feedback(0x03) event type base=0x00},{class=other(0x06) event type base=0x4c};
003:<:0078: 16: XFIXES-Request(137,2): SelectSelectionInput window=0x02e00001 selection=0x150("_NET_WM_CM_S0") eventMask=owner notify,destroy notify,client close notify
003:<:0079:  8: Request(23): GetSelectionOwner atom=0x150("_NET_WM_CM_S0")
003:>:0079:32: Reply to GetSelectionOwner: owner=0x0100000e
003:<:007a: 16: Request(98): QueryExtension name='RENDER'
003:>:007a:32: Reply to QueryExtension: present=true(0x01) major-opcode=138 first-event=0 first-error=140
003:<: Warning: Waiting for rest of package (yet got 8 of 16)!
003:<:007b: 16: Request(98): QueryExtension name='\212\000\003\000\000\000'
003:<: Warning: Waiting for rest of package (yet got 8 of 263720)!
003:>:007b:32: Reply to QueryExtension: present=false(0x00) major-opcode=0 first-event=0 first-error=0
003:<: Warning: Waiting for rest of package (yet got 24 of 263720)!

and the program waits here forever.

I guess some other thread is consuming the _XReply message in above scenario, but I'm not sure what the problem here.
Another oddity is the message "Waiting for rest of package (yet got 8 of 263720)!" but I'm no expert on X11 so I'm not sure what this means.

help greatly appreciated!