Erro 404 ao chamar servlet

Programação Java
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#1

Estou com um problema ao chamar um servlet no meu projeto. Quando chamo o servlet para fazer upload de um arquivo da erro, já tentei de tudo e não consegui resolver o problema, porém, quando abro essa parte de upload em outro projeto ele funciona perfeitamente.

Erro do tomcat:

HTTP Status 404 - /HelloWorldJavaEE/upload


type Status report

message /HelloWorldJavaEE/upload

description The requested resource is not available.


Apache Tomcat/7.0.85

fileupload.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
	<%@ include file="menu.jsp"%>
	<form method="post" action="upload" enctype="multipart/form-data">
		Choose a file : <input type="file" name="file"> <input
			type="submit" value="upload">
	</form>
</body>
</html>

UploadServlet.java

import java.io.File;
import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class UploadServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
	private final String UPLOAD_DIRECTORY = "C:\\Users\\ACER\\Desktop\\trabalho\\upload";

	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		if (ServletFileUpload.isMultipartContent(request)) {
			try {
			String fname = null;
			String fsize = null;
			String ftype = null;
			List<FileItem> multiparts = new ServletFileUpload(new DiskFileItemFactory()).parseRequest(request);
			for (FileItem item : multiparts) {
				if (!item.isFormField()) {
					fname = new File(item.getName()).getName();
					fsize = new Long(item.getSize()).toString();
					ftype = item.getContentType();
					item.write(new File(UPLOAD_DIRECTORY + File.separator + fname));
				}
			}
			// File uploaded successfully
			request.setAttribute("message", "File Uploaded Successfully");
			request.setAttribute("name", fname);
			request.setAttribute("size", fsize);
			request.setAttribute("type", ftype);
		} catch (Exception ex) {
			request.setAttribute("message", "File Upload Failed due to " + ex);
		}

	} else {
		request.setAttribute("message", "Sorry this Servlet only handles file upload request");
	}

	request.getRequestDispatcher("/result.jsp").forward(request, response);

}

}

result.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
	<div id="result">
		<h3>${requestScope["message"]}</h3>
		<br>
	</div>
	File name : ${requestScope["name"]}
	<br> File size : ${requestScope["size"]}
	<br> File type : ${requestScope["type"]}

</body>
</html>

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_3_0.xsd"
	id="WebApp_ID" version="3.0">

	<servlet>
		<servlet-name>Uploadservlet</servlet-name>
		<servlet-class>com.candidjava.servlet.upload.UploadServlet</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>UploadServlet</servlet-name>
		<url-pattern>/upload</url-pattern>
	</servlet-mapping>
</web-app>
#2

Ficou dificil hein, não vi erro aparente, faz o seguinte no teu form coloque o “/” no atributo action ficando assim action="/upload", caso não funciona e esteja usando servlet 3.0+, tire o mapeamento da servlet do web.xml e coloque essa anotação na classe

@webServlet("/upload")
public class UploadServlet extends HttpServlet{}

#3

para debugar melhor olhe a aba network do browser e veja para onde ele faz o request