Question

我正在尝试在Restlet中编写一个Web服务，并且我已经包含了下面列出的jar; 1. json-simple-1.1 2. log4j-1.2.16 3. org.json-20120521 4. org.restlet.ext.fileupload 5. org.restlet.ext.json 6. org.restlet.ext.servlet 7. org.restlet.ext.xml 8. org.restlet 9. servlet-api

当我在tomcat 6中运行此Web服务并将URL命中到浏览器时，我得到异常，告诉他：

 javax.servlet.ServletException: Error instantiating servlet class       
    org.restlet.ext.servlet.ServerServlet
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protoc        ol.java:588)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
java.lang.Thread.run(Unknown Source)
   root cause

java.lang.NoClassDefFoundError: org/restlet/engine/http/ServerCall
java.lang.Class.getDeclaredConstructors0(Native Method)
java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
java.lang.Class.getConstructor0(Unknown Source)
java.lang.Class.newInstance0(Unknown Source)
java.lang.Class.newInstance(Unknown Source)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
java.lang.Thread.run(Unknown Source)

根本原因

   java.lang.ClassNotFoundException: org.restlet.engine.http.ServerCall
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491)
java.lang.Class.getDeclaredConstructors0(Native Method)
java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
java.lang.Class.getConstructor0(Unknown Source)
java.lang.Class.newInstance0(Unknown Source)
java.lang.Class.newInstance(Unknown Source)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
java.lang.Thread.run(Unknown Source)




 Even though the jar is present and my web.xml code as follows:

  <?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>RestletDemo</display-name>


<servlet>
    <servlet-name>RestletServlet</servlet-name>
    <servlet-class>org.restlet.ext.servlet.ServerServlet</servlet-class>
    <init-param>
        <param-name>org.restlet.application</param-name>
        <param-value>com.aris.demo.application.RestletApplication</param-alue>
    </init-param>
</servlet>
<servlet-mapping>
    <servlet-name>RestletServlet</servlet-name>
    <url-pattern>/service/*</url-pattern>
</servlet-mapping>




 </web-app>

请帮帮我.. Thanx提前

Answer 1

我想我已经抓住了你的问题。

您进入了重定位网站，并在页面中下载了restlet发行版。现在您需要再次访问该站点，您将看到已下载Restlet分发的默认J2SE版本。

请从下拉列表中选择第二个选项J2EE并下载。

现在，您将获得所有内容，包括您要查找的org.restlet.jar和org.restlet.ext.servlet.jar。

放置WEB-INF lib，重启服务器，现在生活很快乐。

Answer 2

请确保将jar文件复制到Web应用程序项目中的WEB-INF/lib文件夹。

java.lang.NoClassDefFoundError：org / restlet / engine / http / ServerCall

2 个答案: