Ajax trong Spring MVC

Hiện mình đang làm Ajax trong Spring MVC, khhi controller trả về String thì không có vấn đề gì hết, tuy nhiên nếu trả ra 1 list đối tượng là báo lỗi 406 Not Acceptable. Mình đã tìm hiểu qua Stack overflow nhưng cũng chưa có giải phải nào để xử lý cái này:

Entitiy:
`public class Hocsinh {

private int mahs;
private String ten;
private int tuoi;
public int getMahs() {
	return mahs;
}
public void setMahs(int mahs) {
	this.mahs = mahs;
}
public String getTen() {
	return ten;
}
public void setTen(String ten) {
	this.ten = ten;
}
public int getTuoi() {
	return tuoi;
}
public void setTuoi(int tuoi) {
	this.tuoi = tuoi;
}
public Hocsinh(int mahs, String ten, int tuoi) {
	super();
	this.mahs = mahs;
	this.ten = ten;
	this.tuoi = tuoi;
}
public Hocsinh() {
	super();
	// TODO Auto-generated constructor stub
}

}`

Controller:

 `@Controller
      public class AjaxController {

@RequestMapping(value = "/index", method = RequestMethod.GET)
public String home(){
	return "index";
}

@RequestMapping(value = "/hello", method = RequestMethod.GET)
@ResponseBody
public String hello(){
	return "Hello Ajax";
}

@RequestMapping(value = "/helloname/{name}", method = RequestMethod.GET)
@ResponseBody
public String helloname(@PathVariable String name){
	return "Hello "  + name;
}

@RequestMapping(value = "/dshs", method = RequestMethod.GET)
@ResponseBody
public List<Hocsinh> getds(){
	HocsinhModel hsm = new HocsinhModel();
	return hsm.findAll();
}

}`

Ajax:

$('#btn3').click(function() { $.ajax({ type: "GET", headers: { Accept : "application/json; charset=utf-8", "Content-Type": "application/json; charset=utf-8" }, url: '${pageContext.request.contextPath}/dshs.html', success: function(result){ $('#result2').html("Xong") }, error:function(data,status,er) { alert("error: "+data.tenhang+" status: "+status+" er:"+er); } }); });

pom.xml
`

       <dependency>
	       <groupId>javax.servlet</groupId>
	       <artifactId>javax.servlet-api</artifactId>
	       <version>3.1.0</version>
       </dependency>

       <dependency>	
                <groupId>org.springframework</groupId>
		<artifactId>spring-core</artifactId>
		<version>4.2.6.RELEASE</version>
	</dependency>	

        <dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-web</artifactId>
		<version>4.2.6.RELEASE</version>
	</dependency>

	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-webmvc</artifactId>
		<version>4.2.6.RELEASE</version>
	</dependency>
	<dependency>
		<groupId>org.slf4j</groupId>
		<artifactId>slf4j-api</artifactId>
		<version>1.7.5</version>
	</dependency>
	<dependency>
		<groupId>org.slf4j</groupId>
		<artifactId>slf4j-simple</artifactId>
		<version>1.6.4</version>
	</dependency>

	<dependency>
		<groupId>javax.servlet</groupId>
		<artifactId>jstl</artifactId>
		<version>1.2</version>
	</dependency>
	<dependency>
		<groupId>org.codehaus.jackson</groupId>
		<artifactId>jackson-mapper-asl</artifactId>
		<version>1.9.2</version>
	</dependency>

	<dependency>
		<groupId>org.codehaus.jackson</groupId>
		<artifactId>jackson-core-asl</artifactId>
		<version>1.9.2</version>
	</dependency>

	<dependency>
		<groupId>com.fasterxml.jackson.core</groupId>
		<artifactId>jackson-databind</artifactId>
		<version>2.5.0</version>
	</dependency>`

Ai có cách nào hướng dẫn mình xử lý với.