java - 通过 TomEE plus 服务器连接到 POJO？

Question

我在 Eclipse Kepler EE 中创建了一个动态 Web 项目，将其连接到 Tomee plus 1.7.1 服务器并创建了一个 servlet 和一个 POJO。因此，在打开浏览器并尝试对类执行某些操作后，servlet 按预期工作，但 POJO 返回错误 404。

实际代码是这样的:

//小服务程序

public class MyServlet extends HttpServlet {  
   public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  
      PrintWriter out = response.getWriter();  
      out.println("I'm a servlet.");  
   }  
}  

//web.xml

<servlet>  
    <servlet-name>MyServlet</servlet-name>  
    <servlet-class>package.MyServlet</servlet-class>  
</servlet>  
<servlet-mapping>  
    <servlet-name>MyServlet</servlet-name>  
    <url-pattern>/MyServlet</url-pattern>  
</servlet-mapping>  

因此，当我输入“localhost:8080//MyServlet”时，我得到了预期的“我是一个 servlet”。信息。问题出在 POJO 上:

//POJO

@Path("/MyPOJO")  
public class MyPOJO {  
   @GET  
   public String get() throws IOExeption {  
      return "I'm a POJO.";  
   }  
}  

我对 web.xml 文件中的那个类一无所知。我有这个类(class)，但我真的不知道它是做什么的:

 @ApplicationPath("/sth")  
    public class ApplicationConfig extends Application {      
        @Override  
        public Set<Class<?>> getClasses() {  
            return new HashSet<Class<?>>(Arrays.asList(MyPOJO.class));  
        }  
    }

Application是M2_REPO\javax\ws\rs\javax.ws.rs-api\2.0.1\javax.ws.rs-api-2.0.1.jar中的一个类

所以当我输入“localhost:8080//sth/MyPOJO”时，我得到错误 404，没有异常没有日志。我试过调试，但没有遇到任何断点。

可能和我启动服务器时出现的异常有关:

Nov 19, 2014 6:44:50 PM org.apache.myfaces.ee6.MyFacesContainerInitializer onStartup 
INFO: Added FacesServlet with mappings=[/faces/*, *.jsf, *.faces] 
Nov 19, 2014 6:44:51 PM org.apache.myfaces.config.DefaultFacesConfigurationProvider getStandardFacesConfig 
INFO: Reading standard config META-INF/standard-faces-config.xml 
Nov 19, 2014 6:44:51 PM org.apache.myfaces.webapp.AbstractFacesInitializer initFaces 
SEVERE: An error occured while initializing MyFaces: WebAppBuilder not found in SystemInstance. Ensure the following entry exists in the Tomcat server.xml file: <Listener className="org.apache.tomee.catalina.ServerListener"/> 
java.lang.IllegalStateException: WebAppBuilder not found in SystemInstance. Ensure the following entry exists in the Tomcat server.xml file: <Listener className="org.apache.tomee.catalina.ServerListener"/> 
at org.apache.tomee.myfaces.TomEEAnnotationProvider.getAnnotatedClasses(TomEEAnnotationProvider.java:43) 
at org.apache.myfaces.config.annotation.AnnotationConfigurator.createFacesConfig(AnnotationConfigurator.java:90) 
at org.apache.myfaces.config.DefaultFacesConfigurationProvider.getAnnotationsFacesConfig(DefaultFacesConfigurationProvider.java:152) 
at org.apache.myfaces.config.DefaultFacesConfigurationMerger.getFacesConfigData(DefaultFacesConfigurationMerger.java:91) 
at org.apache.myfaces.config.FacesConfigurator.configure(FacesConfigurator.java:416) 
at org.apache.myfaces.webapp.AbstractFacesInitializer.buildConfiguration(AbstractFacesInitializer.java:370) 
at org.apache.myfaces.webapp.Jsp21FacesInitializer.initContainerIntegration(Jsp21FacesInitializer.java:73) 
at org.apache.myfaces.webapp.AbstractFacesInitializer.initFaces(AbstractFacesInitializer.java:143) 
at org.apache.myfaces.webapp.StartupServletContextListener.contextInitialized(StartupServletContextListener.java:119) 
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4937) 
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434) 
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) 
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) 
at java.util.concurrent.FutureTask.run(Unknown Source) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
at java.lang.Thread.run(Unknown Source) 

Nov 19, 2014 6:44:51 PM org.apache.catalina.util.SessionIdGenerator createSecureRandom 
INFO: Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [162] milliseconds. 
Nov 19, 2014 6:44:59 PM org.apache.myfaces.ee6.MyFacesContainerInitializer onStartup 
INFO: Added FacesServlet with mappings=[/faces/*, *.jsf, *.faces] 
Nov 19, 2014 6:44:59 PM org.apache.myfaces.config.DefaultFacesConfigurationProvider getStandardFacesConfig 
INFO: Reading standard config META-INF/standard-faces-config.xml 
Nov 19, 2014 6:44:59 PM org.apache.myfaces.webapp.AbstractFacesInitializer initFaces 
SEVERE: An error occured while initializing MyFaces: WebAppBuilder not found in SystemInstance. Ensure the following entry exists in the Tomcat server.xml file: <Listener className="org.apache.tomee.catalina.ServerListener"/> 
java.lang.IllegalStateException: WebAppBuilder not found in SystemInstance. Ensure the following entry exists in the Tomcat server.xml file: <Listener className="org.apache.tomee.catalina.ServerListener"/> 
at org.apache.tomee.myfaces.TomEEAnnotationProvider.getAnnotatedClasses(TomEEAnnotationProvider.java:43) 
at org.apache.myfaces.config.annotation.AnnotationConfigurator.createFacesConfig(AnnotationConfigurator.java:90) 
at org.apache.myfaces.config.DefaultFacesConfigurationProvider.getAnnotationsFacesConfig(DefaultFacesConfigurationProvider.java:152) 
at org.apache.myfaces.config.DefaultFacesConfigurationMerger.getFacesConfigData(DefaultFacesConfigurationMerger.java:91) 
at org.apache.myfaces.config.FacesConfigurator.configure(FacesConfigurator.java:416) 
at org.apache.myfaces.webapp.AbstractFacesInitializer.buildConfiguration(AbstractFacesInitializer.java:370) 
at org.apache.myfaces.webapp.Jsp21FacesInitializer.initContainerIntegration(Jsp21FacesInitializer.java:73) 
at org.apache.myfaces.webapp.AbstractFacesInitializer.initFaces(AbstractFacesInitializer.java:143) 
at org.apache.myfaces.webapp.StartupServletContextListener.contextInitialized(StartupServletContextListener.java:119) 
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4937) 
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434) 
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) 
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) 
at java.util.concurrent.FutureTask.run(Unknown Source) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
at java.lang.Thread.run(Unknown Source) 

我已尝试添加 server.xml 文件中缺少的行，但服务器根本无法启动。

当我的大学试图在他的 PC 上运行它时，它可以与 POJO 和 Servlet 一起工作。我们找不到它不在我的电脑上运行的任何原因。

Answer 1

终于成功了。我不得不重新下载 TomEE+。也许我的版本有误。