java - 为什么我在此 REST 教程中得到 404？

Question

我一直在关注此 REST 教程:http://www.vogella.com/tutorials/REST/article.html

我以前使用过 REST，但不是从头开始，也没有使用 Tomcat，所以我想我应该从头开始，然后从头开始。事情是，当涉及到本教程的步骤 6.4 时，我只是得到一个 404。

我的 web.xml 如下所示:

<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
 <display-name>de.vogella.jersey.first</display-name>
  <servlet>
    <servlet-name>Jersey REST Service</servlet-name>
    <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
    <init-param>
      <param-name>com.sun.jersey.config.property.packages</param-name>
      <param-value>de.vogella.jersey.first</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>Jersey REST Service</servlet-name>
    <url-pattern>/rest/*</url-pattern>
  </servlet-mapping>
</web-app>

并且资源似乎在启动时被 Tomcat 检测到:

09/08/2014 9:35:47 AM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: .:/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java
09/08/2014 9:35:47 AM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:RAGRest' did not find a matching property.
09/08/2014 9:35:47 AM org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on http-8080
09/08/2014 9:35:47 AM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 337 ms
09/08/2014 9:35:47 AM org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
09/08/2014 9:35:47 AM org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/6.0.41
09/08/2014 9:35:47 AM com.sun.jersey.api.core.PackagesResourceConfig init
INFO: Scanning for root resource and provider classes in the packages:
  de.vogella.jersey.first
09/08/2014 9:35:47 AM com.sun.jersey.api.core.ScanningResourceConfig logClasses
INFO: Root resource classes found:
  class de.vogella.jersey.first.Hello
09/08/2014 9:35:47 AM com.sun.jersey.api.core.ScanningResourceConfig init
INFO: No provider classes found.
09/08/2014 9:35:47 AM com.sun.jersey.server.impl.application.WebApplicationImpl _initiate
INFO: Initiating Jersey application, version 'Jersey: 1.18 11/22/2013 01:21 AM'
09/08/2014 9:35:48 AM org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on http-8080
09/08/2014 9:35:48 AM org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
09/08/2014 9:35:48 AM org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/9  config=null
09/08/2014 9:35:48 AM org.apache.catalina.startup.Catalina start
INFO: Server startup in 956 ms

并且 tomcat 在 localhost:8080 启动并运行，这在浏览器中访问它得到了证明。然而，当我点击 http://localhost:8080/de.vogella.jersey.first/rest/hello 时，我得到的只是 404。

我是否漏掉了一些显而易见的东西？我一定是……

以防万一，这是在 MacBook Pro 上的 Eclipse Helios 中运行 tomcat 6。

Answer 1

URL 部分“de.vogella.jersey.first”需要是您的 WAR 部署单元的名称(或特定于 Web 容器的方法，如 jboss-web.xml 或 Tomcat context .xml).

至少对于普通的 web-apps 是这样的，不知道为什么教程会提到显示名称。