自定义Exception

public class RException extends Exception {

	private static final long serialVersionUID = 1L;
	
	public RException(){
		super();
	}
	
	public RException(String msg){
		super(msg);
	}
	
	public RException(Throwable e){
		super(e);
	}
	
	public RException(String msg, Throwable e){
		super(msg, e);
	}
	
}