Scenario : Adding / Removing read warning listener Add the read warning listener and check whether it is notified when any non-fatal error occurs while reading process is in progress.Remove the read update listener added and no method of the listener should be invoked thereafter

Failure :removeIIOReadWarningListener() is throwing an Exception
   java.lang.NullPointerException
 Exception thrown

java.lang.NullPointerException
        at ReadWarningBUG.warn(ReadWarningBUG.java:177)
        at ReadWarningBUG.actionPerformed(ReadWarningBUG.java:213)
        at java.awt.Button.processActionEvent(Button.java:354)
        at java.awt.Button.processEvent(Button.java:327)
        at java.awt.Component.dispatchEventImpl(Component.java:3460)
        at java.awt.Component.dispatchEvent(Component.java:3327)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:437)
        at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:140)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:126)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:121)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)
     The bug is occuring on all the platforms

The Attached file has been changed

The Exception thrown is as below

java.lang.NullPointerException
        at javax.imageio.ImageReader.removeIIOReadWarningListener(ImageReader.java:1732)
        at ReadWarningBUG.actionPerformed(ReadWarningBUG.java:112)
        at java.awt.Button.processActionEvent(Button.java:354)
        at java.awt.Button.processEvent(Button.java:327)
        at java.awt.Component.dispatchEventImpl(Component.java:3460)
        at java.awt.Component.dispatchEvent(Component.java:3327)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:437)
        at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:140)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:126)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:121)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)

blessen.mathews@Eng 2001-01-31