Why always ajax error-CodePudding

This is a servlet

 
import java.io.IOException; 
Import the Java. IO. PrintWriter; 
import java.util.ArrayList; 
import java.util.List; 

The import javax.mail. Servlet. ServletException; 
The import javax.mail. Servlet. ServletRequestAttributeEvent; 
The import javax.mail. Servlet. The annotation. WebServlet; 
The import javax.mail. Servlet. HTTP. HttpServlet; 
The import javax.mail. Servlet. HTTP. It; 
import javax.servlet.http.HttpServletResponse; 


The import com. Fasterxml. Jackson. Databind. ObjectMapper; 
The import com. Fasterxml. Jackson. Databind. JsonFormatVisitors. JsonArrayFormatVisitor; 

Import JDK. Nashorn. Internal. Runtime. Would the LinkerCallSite; 
The import net. Sf. Json. JSONArray; 

/* * 
* the Servlet implementation class Process 
*/
@ WebServlet ("/Process ") 
Public class Process extends the HttpServlet {
private static final long serialVersionUID=1L; 

/* * 
* @ see HttpServlet# HttpServlet () 
*/
Public Process () {
super(); 
//TODO Auto - generated constructor stub 
} 

/* * 
* @ see HttpServlet# doGet (it request, HttpServletResponse response) 
*/
Protected void doGet (it request, HttpServletResponse response) throws ServletException, IOException {
//TODO Auto - generated method stub 
//response. GetWriter (). Append (" Served at: "), append (request) getContextPath ()); 
//the doPost (request, response); 

} 

/* * 
* @ see HttpServlet# doPost (it request, HttpServletResponse response) 
*/
Protected void doPost (it request, HttpServletResponse response) throws ServletException, IOException {
//TODO Auto - generated method stub 
//doGet (request, response); 
List List=new ArrayList (a); 
List. The add (new test (20, 1)); 
List. The add (new test (10, 2)); 
List. The add (new test (30, 3)); 
List. The add (new test (25, 4)); 
List. The add (new test (50, 5)); 
List. The add (new test (5, 6)); 
List. The add (new test (15, 7)); 

//ObjectMapper mapper=new ObjectMapper ();//Java - json transformation class 
//String json=mapper. WriteValueAsString (list); 
//System. Out. Println (json); 
JSONArray JSONArray=JSONArray. FromObject (list); 
The response. GetWriter (). Println (jsonArray); 

} 

}

This is the front

 
<% @ page language="Java" contentType="text/HTML. Charset=utf-8 "
PageEncoding="utf-8" % & gt; 
 
 
<meta HTTP - equiv="content-type" Content="text/HTML. Charset=utf-8 "& gt; 
 Insert the title here 
<script SRC="https://bbs.csdn.net/topics/jquery-3.5.1.js" & gt; </script> 
<script SRC="https://bbs.csdn.net/topics/echarts.min.js" & gt; </script> 
 
<body> 

 
 
//based on dom, prepared to initialize ecahrts instance 
Var myChart=echarts. Init (document. GetElementById (" graph ")); 

//specified icon of configuration items and data 
MyChart. SetOption={
Title: {
Text: "data visualization" 
}, 
Tooltip: {}, 
Legend: {
Left: "right," 
Data: [" concentration "] 
}, 
XAxis: {
Data: [] 
}, 
YAxis: {}, 
Series: [{
Name: 'concentration' 
Data: [] 
}] 

}; 
Var XX=[];//x coordinate values 
Var YY=[];//y coordinate values 

//Ajax data request 
$. Ajax ({
Type: "post", 
Async: true, asynchronous request//
Url:/Process ", "
Data: {}, 
DataType: "json", 

//request after a successful accept receiving data xtime + yppm two groups of data; 
Success: the function (result) {
Alert (" asdsad ") 
//result for the server returns a json object 
If (result) {
//remove the data storage array 
for(var i=0; iXX. Push (result [I]. X); 
for(var i=0; iYY. Push (result [I] y); 

//cover according to the data load operation data table 
MyChart. SetOption ({
XAxis: {data: XX}, 
Series: [{
//the name: "concentration", 
Date: YY 
}] 
}); 
} 
}, 
Error: function (errorMsg) {
//request fails to execute the function 
Alert (" icon data request failed "); 
MyChart. Hideloading (); 
} 

}) 


</script>

This is the directory structure