SpringMVC使用ResponseBody报406错误

HTTP Status 406 -

type Status report

message

description The resource identified by this request is only capable of generating responses with characteristics not acceptable according to the request "accept" headers ().
Apache Tomcat/7.0.23

package com.live.common;

import java.text.MessageFormat;
import java.util.ArrayList;

public class FieldValidation {

private ArrayList<FieldError> fieldErrorBeans = new ArrayList<FieldError>();

public void addFieldError(String fieldSelector, String errorMsg) {
FieldError error = new FieldError();
error.setFieldSelector(fieldSelector);
error.setErrorMsg(errorMsg);
fieldErrorBeans.add(error);
}

public boolean hasError() {
return !fieldErrorBeans.isEmpty();
}

/**
*
* @param fieldSelector
*            filed name or jquery selector
* @param value
*/
public void required(String fieldSelector, Object value) {
if (null == value || value.toString().trim().length() == 0) {
addFieldError(fieldSelector, "不能为空!");
}
}

public void requiredLength(String fieldSelector, String value, int min,
int max) {
if (null == value) {
return;
}

int len = value.length();
if (min != -1 && max != -1) {
if (len < min || len > max) {
String msg = MessageFormat.format("长度必须在{0}~{1}之间!", min, max);
addFieldError(fieldSelector, msg);
}
} else if (min != -1) {
if (len < min) {
String msg = MessageFormat.format("长度必须大于${0}!", min);
addFieldError(fieldSelector, msg);
}
} else if (max != -1) {
if (len > max) {
String msg = MessageFormat.format("长度必须小于${0}!", max);
addFieldError(fieldSelector, msg);
}
}
}

}