ConcurrentModificationException in AppContext code

the following problem has been reported by ###@###.###

I happened to find this exception in one of our nightly testing logs. Is this a known issue? It looks like a lack of synchronization in AppContext.getAppContexts().

Exception in thread "Thread-2" java.lang.ExceptionInInitializerError
    at com.sun.deploy.util.DeployUIManager.setLookAndFeel(Unknown Source)
    at sun.plugin.util.PluginSysUtil$1.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.util.ConcurrentModificationException
    at java.util.IdentityHashMap$IdentityHashMapIterator.nextIndex(Unknown Source)
    at java.util.IdentityHashMap$ValueIterator.next(Unknown Source)
    at java.util.AbstractCollection.addAll(Unknown Source)
    at java.util.HashSet.<init>(Unknown Source)
    at sun.awt.AppContext.getAppContexts(Unknown Source)
    at java.awt.Toolkit$DesktopPropertyChangeSupport.firePropertyChange(Unknown Source)
    at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
    at java.awt.Toolkit.setDesktopProperty(Unknown Source)
    at sun.awt.windows.WToolkit.updateProperties(Unknown Source)
    at sun.awt.windows.WToolkit.lazilyInitWProps(Unknown Source)
    at sun.awt.windows.WToolkit.lazilyLoadDesktopProperty(Unknown Source)
    at java.awt.Toolkit.getDesktopProperty(Unknown Source)
    at javax.swing.UIManager.<clinit>(Unknown Source)
    ... 3 more