HTTP Status 405 - HTTP method GET is not supported by this URL [duplicate]

Question

The code below is from a book,so it'll not be incorrect.But I don't know how to solve this below error.When delete the method doGet(),the same error!

"HTTP Status 405 - HTTP method GET is not supported by this URL"

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class PDFServlet extends HttpServlet{
private static final long serialVersionUID = 1L;
@Override 
protected void doGet(HttpServletRequest request,HttpServletResponse response) 
throws IOException,ServletException{
    this.doPost(request,response);
}
@Override 
protected void doPost(HttpServletRequest request,HttpServletResponse response) 
                                   throws IOException,ServletException{
    response.setContentType("application/pdf");
    ServletOutputStream out=response.getOutputStream();
    File pdf=null;
    BufferedInputStream buf=null;
    try{
        pdf=new File("C:\\Users\\lk\\Desktop\\Desktop\\ example.pdf");
        response.setContentLength((int)pdf.length());
        FileInputStream input=new FileInputStream(pdf);
        buf=new BufferedInputStream(input);
        int readBytes=0;
        while((readBytes=buf.read())!=-1)    out.write(readBytes);
    }catch(IOException e){
        System.out.println("file not found!");
    }finally{
        if(out!=null) out.close();
        if(buf!=null) buf.close();
    }
}
}

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
-<web-app xsi:.........." version="2.5"> 
-<servlet> 
<description>This is the description of my Java EE component</description> 
<display-name>This is the display name of my Java EE component</display-name> 
<servlet-name>PDFServlet</servlet-name> 
<servlet-class>PDFServlet</servlet-class> 
</servlet> 
-<servlet-mapping> 
<servlet-name>PDFServlet</servlet-name> 
<url-pattern>/PDFServlet</url-pattern> 
</servlet-mapping> 
-<welcome-file-list> 
<welcome-file>index.jsp</welcome-file> 
</welcome-file-list> 
-<login-config> 
<auth-method>BASIC</auth-method> 
</login-config> 
</web-app>

Answer 1

I had this same problem just now. "HTTP Status 405 - HTTP method GET is not supported by this URL". My solution was as follows:

public abstract class Servlet extends HttpServlet {

    protected HttpServletRequest req;
    protected HttpServletResponse resp;

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.req = req;
        this.resp = resp;
        this.requestManager();
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.req = req;
        this.resp = resp;
        this.requestManager();

    }

    protected abstract void requestManager() throws IOException;
}

I had problem in my constructor, because the "doGet" I was calling the super

Answer 2

The Servlet code seems correct. Provide web.xml entry and Servlet calling URL.

There are two main reasons which cause this error:

1) You do not have a valid doGet() method, when you type the servlet’s path in address bar directly, the web container like Tomcat will try to invoke the doGet() method.

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException{
....
}

2) You made a HTTP post request from a HTML form, but you do not have a doPost() method to handle it. The doGet() can not handle the “Post” request.

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws IOException{
....
}

Read @BalusC's answer for more details. : doGet and doPost in Servlets