javax.servlet.ServletException：实例化servlet类时出错

Question

我试图从JBOss服务器访问网址..我有一个错误

javax.servlet.ServletException: Error instantiating servlet class com.tg.simReplacementApi.ReplaceSim
            org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153)
            org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
            org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368)
            org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877)
            org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671)
            org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930)
            java.lang.Thread.run(Thread.java:701)
        root cause

        java.lang.ClassNotFoundException: com.tg.simReplacementApi.ReplaceSim from [Module "deployment.ReplacementSim.war:main" from Service Module Loader]
            org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:190)
            org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:468)
            org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:456)
            org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:398)
            org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:120)
            org.jboss.as.web.deployment.WebInjectionContainer.newInstance(WebInjectionContainer.java:72)
            org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153)
            org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
            org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368)
            org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877)
            org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671)
            org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930)
            java.lang.Thread.run(Thread.java:701)

和我的web.xml

    <!DOCTYPE web-app PUBLIC
     "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
     "http://java.sun.com/dtd/web-app_2_3.dtd" >

    <web-app>
      <display-name>Web Application</display-name>
      <servlet>
        <servlet-name>ReplaceSim</servlet-name>
        <display-name>ReplaceSim</display-name>
        <description></description>
        <servlet-class>com.tg.simReplacementApi.ReplaceSim</servlet-class>
      </servlet>
      <servlet-mapping>
        <servlet-name>ReplaceSim</servlet-name>
        <url-pattern>/ReplaceSim</url-pattern>
      </servlet-mapping>
    </web-app>

和servlet是ReplaceSim.java

package com.tg.simReplacementApi;

import java.io.IOException;

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

/**
 * Servlet implementation class ReplaceSim
 */
public class ReplaceSim extends HttpServlet {
    private static final long serialVersionUID = 1L;
    public ReplaceSim(){

    }

  /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().append("Served at: ").append(request.getContextPath());
        Member member = new Member();
        member.setPhoneNo(request.getParameter("phone"));
        member.setSimSerial(request.getParameter("simSerial"));
        WebServiceCaller call = new WebServiceCaller();
        String resp = call.getReplacementSim(member);
        System.out.println(resp);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

}

并成功部署到jboss7.1.1服务器中。访问URL时发生此错误。在localhost中，应用程序运行正常。

任何人都可以知道它导致错误的原因..提前感谢