CallbackHandler implementations may throw exceptions of this type from their handle( ) method if a Callback object passed to that method is of an unrecognized or unsupported type. Note that the offending Callback object must be passed to the constructor method.

Figure 19-13. javax.security.auth.callback.UnsupportedCallbackException

public class UnsupportedCallbackException extends Exception {
// Public Constructors
     public UnsupportedCallbackException(Callback callback);  
     public UnsupportedCallbackException(Callback callback, String msg);  
// Public Instance Methods
     public Callback getCallback( );  
}

Thrown By

CallbackHandler.handle( )