I also see this on Debian unstable, so it most probably not
an issue with a Ubuntu specific x server:

java.lang.RuntimeException: cannot load system cursor: CopyDrop.32x32
        at sun.awt.X11.XToolkit.lazilyLoadDesktopProperty(XToolkit.java:1541)
        at java.awt.Toolkit.getDesktopProperty(Toolkit.java:1803)
        at java.awt.dnd.DragSource.load(DragSource.java:131)
        at java.awt.dnd.DragSource.<clinit>(DragSource.java:148)
        at org.jajuk.ui.helpers.TableTransferHandler.<init>(Unknown Source)
        at org.jajuk.ui.helpers.PlaylistEditorTransferHandler.<init>(Unknown 
Source)
        at org.jajuk.ui.views.QueueView.initUI(Unknown Source)
        at 
org.jajuk.ui.perspectives.PerspectiveManager.setCurrentPerspective(Unknown 
Source)
        at org.jajuk.ui.perspectives.PerspectiveManager.init(Unknown Source)
        at org.jajuk.ui.windows.JajukMainWindow.initUI(Unknown Source)
        at org.jajuk.ui.windows.WindowStateDecorator.display(Unknown Source)
        at org.jajuk.services.startup.StartupGUIService$6.run(Unknown Source)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
        at java.awt.EventQueue.access$500(EventQueue.java:97)
        at java.awt.EventQueue$3.run(EventQueue.java:709)
        at java.awt.EventQueue$3.run(EventQueue.java:703)
        at java.security.AccessController.doPrivileged(Native Method)
        at 
java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
        at 
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
        at 
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
        at 
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Caused by: java.awt.AWTException: Exception: class 
java.lang.IllegalArgumentException Width (0) and height (0) must be non-zero 
occurred while creating cursor CopyDrop.32x32
        at java.awt.Cursor.getSystemCustomCursor(Cursor.java:363)
        at sun.awt.X11.XToolkit.lazilyLoadDesktopProperty(XToolkit.java:1539)
        ... 25 more
Exception in thread "AWT-EventQueue-0" java.lang.ExceptionInInitializerError
        at org.jajuk.ui.helpers.TableTransferHandler.<init>(Unknown Source)
        at org.jajuk.ui.helpers.PlaylistEditorTransferHandler.<init>(Unknown 
Source)
        at org.jajuk.ui.views.QueueView.initUI(Unknown Source)
        at 
org.jajuk.ui.perspectives.PerspectiveManager.setCurrentPerspective(Unknown 
Source)
        at org.jajuk.ui.perspectives.PerspectiveManager.init(Unknown Source)
        at org.jajuk.ui.windows.JajukMainWindow.initUI(Unknown Source)
        at org.jajuk.ui.windows.WindowStateDecorator.display(Unknown Source)
        at org.jajuk.services.startup.StartupGUIService$6.run(Unknown Source)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
        at java.awt.EventQueue.access$500(EventQueue.java:97)
        at java.awt.EventQueue$3.run(EventQueue.java:709)
        at java.awt.EventQueue$3.run(EventQueue.java:703)
        at java.security.AccessController.doPrivileged(Native Method)
        at 
java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
        at 
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
        at 
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
        at 
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Caused by: java.lang.RuntimeException: failed to load system cursor: 
DnD.Cursor.CopyDrop : cannot load system cursor: CopyDrop.32x32
        at java.awt.dnd.DragSource.load(DragSource.java:135)
        at java.awt.dnd.DragSource.<clinit>(DragSource.java:148)
        ... 22 more

(here when starting jajuk, but I've also seen this with freeplane)

** Changed in: xorg-server (Ubuntu)
       Status: Invalid => In Progress

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1232471

Title:
  Java apps crash under XMir trying to set a custom cursor

Status in JOSM:
  Unknown
Status in xorg-server package in Ubuntu:
  In Progress

Bug description:
  Java apps crash under XMir (cannot load system cursor)

  ORIGINAL DESCRIPTION:
  When i run XMir an Unity System Compositor, java based applications JetBrains 
PyCharm and IntelliJ (those i've tested) don't work correctly.
  At this time i haven't tested Elicpse or NetBeans so i don't know if is 
general problem with OpenJDK.

To manage notifications about this bug go to:
https://bugs.launchpad.net/josm/+bug/1232471/+subscriptions

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