简单的Jetty/Maven Hello World webapp中出现404找不到错误 [英] 404 Not Found Error in a simple Jetty/Maven Hello World webapp

问题描述

我已按照说明创建了带有Jetty和Maven的标准Web应用程序" 精确，如eclipse Wiki所述:

任何帮助将不胜感激.我真的很想开始使用这项技术，但是它令人沮丧，无法继续撞到同一个死胡同.

(请注意:创建"JettyMavenHelloWorld"的教程的第一部分工作正常.我的第二部分是"JettyMavenHelloWarApp".本节的标题为使用Jetty和Maven开发标准WebApp")

JettyMavenHelloWarApp/pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" 
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
      xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

  <modelVersion>4.0.0</modelVersion>
  <groupId>org.example</groupId>
  <artifactId>hello-world</artifactId>
  <version>0.1-SNAPSHOT</version>
  <packaging>jar</packaging>
  <name>Jetty HelloWorld</name>

  <properties>
    <jettyVersion>7.2.0.v20101020</jettyVersion>
  </properties>

  <dependencies>
    <dependency>
      <groupId>org.eclipse.jetty</groupId>
      <artifactId>jetty-server</artifactId>
      <version>${jettyVersion}</version>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <!-- This plugin is needed for the servlet example -->
        <groupId>org.mortbay.jetty</groupId>
        <artifactId>jetty-maven-plugin</artifactId>
        <version>${jettyVersion}</version>
      </plugin>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>exec-maven-plugin</artifactId>
        <version>1.1</version>
        <executions>
          <execution><goals><goal>java</goal></goals></execution>
        </executions>
        <configuration>
          <mainClass>org.example.HelloWorld</mainClass>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

JettyMavenHelloWarApp/src/main/java/org/example/HelloServlet.java

package org.example;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HelloServlet extends HttpServlet
{
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        response.setContentType("text/html");
        response.setStatus(HttpServletResponse.SC_OK);
        response.getWriter().println("<h1>Hello Servlet</h1>");
        response.getWriter().println("session=" + request.getSession(true).getId());
    }
}

JettyMavenHelloWarApp/src/main/webapp/WEB-INF/web.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app 
   xmlns="http://java.sun.com/xml/ns/javaee" 
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" 
   version="2.5">
  <servlet>
    <servlet-name>Hello</servlet-name>
    <servlet-class>org.example.HelloServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Hello</servlet-name>
    <url-pattern>/hello/*</url-pattern>
  </servlet-mapping>
</web-app>

JettyMavenHelloWarApp/src/main/webapp/index.html

<h1>Hello World Webapp</h1>
<a href="/hello">Hello Servlet</a>

解决方案

该教程提供了错误的网址-您的应用上下文仍为"/"， 因此静态和动态内容的网址分别为http://localhost:8080和http://localhost:8080/hello.

Maven Jetty插件文档确实声称默认上下文的名称与pom.xml中的artifactId相同，但这似乎在这里不起作用.

I have followed the instructions to create a "Standard WebApp with Jetty and Maven" precisely as described on the eclipse wiki: http://wiki.eclipse.org/Jetty/Tutorial/Jetty_and_Maven_HelloWorld#Developing_a_Standard_WebApp_with_Jetty_and_Maven

However when I run the webapp (mvn jetty:run) and go to localhost:8080/hello-world/hello I end up at a "HTTP ERROR 404 Problem accessing /hello-world/hello. Reason: Not Found". I have read through documentation, looked at the wiki page's history, poked around other forums and stackoverflow threads, but can not find the answer to this seemingly simple problem. I will post my source, but it is literally the same as the tutorial.

Any help would be appreciated. I'd really like to start playing around with this technology but its disheartening to keep slamming into the same dead end.

(Please note: the first part of the tutorial to create "JettyMavenHelloWorld" work fine. My problem is with the second part, "JettyMavenHelloWarApp". This section is titled "Developing a Standard WebApp with Jetty and Maven")

JettyMavenHelloWarApp/pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" 
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
      xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

  <modelVersion>4.0.0</modelVersion>
  <groupId>org.example</groupId>
  <artifactId>hello-world</artifactId>
  <version>0.1-SNAPSHOT</version>
  <packaging>jar</packaging>
  <name>Jetty HelloWorld</name>

  <properties>
    <jettyVersion>7.2.0.v20101020</jettyVersion>
  </properties>

  <dependencies>
    <dependency>
      <groupId>org.eclipse.jetty</groupId>
      <artifactId>jetty-server</artifactId>
      <version>${jettyVersion}</version>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <!-- This plugin is needed for the servlet example -->
        <groupId>org.mortbay.jetty</groupId>
        <artifactId>jetty-maven-plugin</artifactId>
        <version>${jettyVersion}</version>
      </plugin>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>exec-maven-plugin</artifactId>
        <version>1.1</version>
        <executions>
          <execution><goals><goal>java</goal></goals></execution>
        </executions>
        <configuration>
          <mainClass>org.example.HelloWorld</mainClass>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

JettyMavenHelloWarApp/src/main/java/org/example/HelloServlet.java

package org.example;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HelloServlet extends HttpServlet
{
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        response.setContentType("text/html");
        response.setStatus(HttpServletResponse.SC_OK);
        response.getWriter().println("<h1>Hello Servlet</h1>");
        response.getWriter().println("session=" + request.getSession(true).getId());
    }
}

JettyMavenHelloWarApp/src/main/webapp/WEB-INF/web.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app 
   xmlns="http://java.sun.com/xml/ns/javaee" 
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" 
   version="2.5">
  <servlet>
    <servlet-name>Hello</servlet-name>
    <servlet-class>org.example.HelloServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Hello</servlet-name>
    <url-pattern>/hello/*</url-pattern>
  </servlet-mapping>
</web-app>

JettyMavenHelloWarApp/src/main/webapp/index.html

<h1>Hello World Webapp</h1>
<a href="/hello">Hello Servlet</a>

解决方案

The tutorial gives the incorrect url - your app context is still "/", so the urls are http://localhost:8080 and http://localhost:8080/hello for the static and dynamic content, respectively.

The maven jetty plugin documentation does claim that the default context will be named the same as the artifactId in the pom.xml, but that doesn't seem to be working here.

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