Servlet没有运行

Question

在运行servlet时，我将得到以下异常报告。有什么问题吗？

类型异常报告

消息

服务器遇到一个内部错误()，无法完成此请求。

异常

javax.servlet.ServletException: Wrapper cannot find servlet class servlets.Nm or a class it depends on
    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:859)
    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(Thread.java:744)

root cause

java.lang.ClassNotFoundException: servlets.Nm
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
    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:859)
    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(Thread.java:744)

注意，在Apache /6.0.32日志中可以找到根本原因的完整堆栈跟踪。

Web.xml：

<?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>LoadImage</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
    <description></description>
    <display-name>FileUpload</display-name>
    <servlet-name>FileUpload</servlet-name>
    <servlet-class>servlets.FileUpload</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>FileUpload</servlet-name>
    <url-pattern>/FileUpload</url-pattern>
  </servlet-mapping>
  <servlet>
    <description></description>
    <display-name>Checking</display-name>
    <servlet-name>Checking</servlet-name>
    <servlet-class>servlets.Checking</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Checking</servlet-name>
    <url-pattern>/Checking</url-pattern>
  </servlet-mapping>
</web-app>

Answer 1

我认为在war的WEB/ class文件夹中没有类。或者在WEB/lib中的jar中，请手动检查war文件，看看这个类是否存在。