即使类在包中,也无法从tomcat服务器运行我的servlet

Question

我试图让我的servlet运行,我一直在寻找2天,并尝试每一个可能的解决方案,没有运气.servet类位于相应的文件夹中(即在包名称下).我还将我的servlet中需要的jar文件添加到lib文件夹中.web.xml文件映射url并定义servlet.所以我在文档中做了一切,wt人在这里说,但仍然收到此错误:

    type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Error instantiating servlet class assign1a.RPCServlet
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:108)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:558)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:379)
    org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:282)
    org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:357)
    org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1687)
    java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    java.lang.Thread.run(Thread.java:619)
root cause

java.lang.NoClassDefFoundError: assign1a/RPCServlet (wrong name: server/RPCServlet)
    java.lang.ClassLoader.defineClass1(Native Method)
    java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
    java.lang.ClassLoader.defineClass(ClassLoader.java:616)
    java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
    org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2820)
    org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1143)
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1638)
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1516)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:108)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:558)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:379)
    org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:282)
    org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:357)
    org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1687)
    java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    java.lang.Thread.run(Thread.java:619)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.5 logs.

这也是我的servlet代码:

package assign1a;

import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

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

import lib.jsonrpc.RPCService;

public class RPCServlet extends HttpServlet {

        /**
         * 
         */
        private static final long serialVersionUID = -5274024331393844879L;


        private static final Logger log = Logger.getLogger(RPCServlet.class.getName());

        protected RPCService service = new ServiceImpl();

        public void doGet(HttpServletRequest request, HttpServletResponse response)
                        throws IOException, ServletException {
                response.setContentType("text/html");
                response.getWriter().write("rpc service " + service.getServiceName() +  " is running...");
        }

        public void doPost(HttpServletRequest request, HttpServletResponse response)
                        throws IOException, ServletException {

                try {
                        service.dispatch(request, response);
                } catch (Throwable t) {
                        log.log(Level.WARNING, t.getMessage(), t);
                }
        }

}

请帮帮我:)谢谢.

编辑:这是我的web.xml文件的内容

<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_3_0.xsd"
  version="3.0"
  metadata-complete="true">  


    <servlet>
        <servlet-name>jsonrpc</servlet-name>
        <servlet-class>assign1a.RPCServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>jsonrpc</servlet-name>
        <url-pattern>/rpc</url-pattern>
    </servlet-mapping>

</web-app>

Answer 1

我注意到(wrong name: server/RPCServlet)错误消息中的这句话。

这通常意味着类文件的包名称与 jar/war 中的目录结构不同。

也许您最初放置RPCServlet.java在名为 的目录下server，然后RPCServlet.java移至assign1a?

或者原始包可能定义为：

package server;

然后你后来把它改成了

package assign1a;

不管怎样，为了解决这个问题，我建议你删除所有编译的东西（类文件、war 文件等）。停止 tomcat，然后删除该<TOMCAT_HOME>/work目录以确保所有内容都消失。

然后，检查并确保 RPCServlet.java 位于名为 的文件夹中assign1a，并确保该包定义为：

package assign1a;

重新编译/重建 war，你应该处于更好的状态。也许尝试在 Eclipse（或 Netbeans）中构建 war，因为这样它不会让您编译到与类文件包名称不匹配的文件夹中。

祝你好运。- 戴夫