自定义异常

public class ParamException extends Exception{

private static final long serialVersionUID = 3941133113562944154L;

private static final String fmt = "%s error!";

public static ParamException getWsParamException(String paramName){
return new ParamException(String.format(fmt, String.valueOf(paramName)));
}

public ParamException(String msg){
super(msg);
}

}