Spring MVC @ResponseBody给出ERROR HTTP状态406 - 不可接受

Question

我正在尝试使用spring创建一个简单的restful Web服务代码。 这是我到目前为止创建的完整代码：

的web.xml ：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
    <display-name>TemporaryTry01</display-name>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>

    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>
</web-app>

调度-servlet.xml中：

<?xml version="1.0" encoding="UTF-8"?>       
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
    <context:component-scan base-package="com.arman"/>
</beans>

Student.java ：

package com.arman.dta;
import com.fasterxml.jackson.annotation.JsonProperty;
public class Student {
    @JsonProperty("student_name")
    private String studentName;
    private long mobileNo;

    public String getStudentName() {
        return studentName;
    }
    public void setStudentName(String studentName) {
        this.studentName = studentName;
    }
    public long getMobileNo() {
        return mobileNo;
    }
    public void setMobileNo(long mobileNo) {
        this.mobileNo = mobileNo;
    }
}

HelloController.java

package com.arman.controller;

import java.util.ArrayList;
import java.util.List;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import com.arman.dta.Student;

@Controller
public class HelloController {

    @ResponseBody
    @RequestMapping(value="/students", method=RequestMethod.GET) // already Tried to add produces attribute explicitly with MediaType.APPLICATION_JSON_VALUE but that too is not working
    public ArrayList<Student> getStudentList(){
        Student st = new Student();
        st.setStudentName("Arman");
        st.setMobileNo(903434555L);

        Student st1 = new Student();
        st1.setStudentName("Avasthi");
        st1.setMobileNo(779232245L);

        ArrayList<Student> studentList = new ArrayList<Student>();
        studentList.add(st);
        studentList.add(st1);
        return studentList;
    }
}

我已添加所有弹簧罐（版本4.2.2），公共记录罐和3杰克逊罐子，即： 杰克逊的注解 - 2.8.1.jar 杰克逊核心2.8.1.jar 杰克逊 - 数据绑定-2.8.1.jar

使用Eclipse Oxygen IDE，我没有遇到编译时问题。但是当我运行项目（在端口号7070 上的Tomcat 8上）并尝试访问：

http://localhost:7070/TemporaryTry01/students

我收到以下错误页面

在堆栈跟踪中显示：

  

2017年12月10日下午8:51:15 org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver logException   警告：处理程序执行导致异常：找不到可接受的表示