javaservletshttp-status-code-500nosuchmethod

Status 500 error instantiating servlet class caused by java.lang.NoSuchMethodException ronit.hello<init>

I was executing a web project and it is throwing an error 500 error instatiating servlet class . I am using tomcat 9.0.71 and using web module 4.0 .

This is the error message on the screen.

This is the error page status 500

This is the HTML document

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>This is a hello world</h1>
<br>
<form action ="hello" method="get">
<input type="submit">click to say hello world
</form>
</body>
</html>

This is the servlet class

package ronit;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.*;
@WebServlet("/hello")
class hello extends HttpServlet{
 static final long serialVersionUID = 35335L;
public void doGet(HttpServletRequest req, HttpServletResponse res) {

try {
PrintWriter p = res.getWriter();

p.println("Hello World");
}catch(IOException e) {e.printStackTrace();}
}}

This is the deployment configuration in the server

This is the servlet view

This is the console after execution

This is the project explorer view

I am using annotations instead of web.xml and deploying the file by right clicking on the project and run on server.

Solution

  • Your servlet class has no public, zero argument, constructor. It needs one, otherwise Tomcat can not instantiate it--exactly as the error output is telling you.