problem JDK 1.50.22 Oracle application Server 10.2.0.1

Hi, we found the following error in java console :

java.lang.reflect.InvocationTargetException
    at sun.plugin.util.PluginSysUtil.invokeAndWait(Unknown Source)
    at sun.plugin.JavaRunTime.showJavaConsole(Unknown Source)
Caused by: java.lang.ClassCastException: javax.swing.KeyStroke
    at java.util.TreeMap.compare(Unknown Source)
    at java.util.TreeMap.put(Unknown Source)
    at java.util.TreeSet.add(Unknown Source)
    at javax.swing.JComponent.getManagingFocusBackwardTraversalKeys(Unknown Source)
    at javax.swing.JTextArea.<init>(Unknown Source)
    at javax.swing.JTextArea.<init>(Unknown Source)
    at com.sun.deploy.util.ConsoleWindow.<init>(Unknown Source)
    at com.sun.deploy.util.ConsoleWindow.create(Unknown Source)
    at sun.plugin.JavaRunTime.getJavaConsole(Unknown Source)