Bug 114774 [javadoc location] validate does not work with ! in path
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/JavadocConfigurationBlock.java
public ZipDialogValidator() {
			super();
		}		
			
		/*
		 * @see ISelectionValidator#validate(Object[])
		 */
		public IStatus validate(Object[] selection) {
			String message= ""; 
			return new StatusInfo(IStatus.INFO, message);
		}
	}	
}