I have a question about servlet.When I visit servlet,I got HTTP Status 500 -
Internal Server Error.I don't know why?
My program is follows:
D:\Apache Tomcat 4.0\webapps\login\WEB-INF\classes\GetUserIdentity.class
D:\Apache Tomcat 4.0\webapps\login\WEB-INF\web.xml
D:\Apache Tomcat 4.0\webapps\login\servlets\index.html
The file GetUserIdentity.class is follows:
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Properties;
import javax.naming.Context;
import javax.naming.InitialContext;
public class GetUserIdentity
{
public void doPost(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException
{
try
{
PrintWriter out=response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title> Hello </title>");
out.println("</head>");
out.println("</html>");
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
The file index.html is follows:
<html>
<head>
<title>Check Identity</title>
</head>
<body>
<center>
<br><br>
<form action="http://192.168.39.152:8080/login/servlet/GetUserIdentity";
method="POST">
<table align="center" width="%100" cellspacing="2" cellpadding="2">
<tr>
<td align="right">Input ID </td>
<td><input type="Text" name="ID" align="left" size=15></td>
</tr>
<br><br><br>
<tr>
<td align="right">Input Password </td>
<td><input type="password" name="password" align="left" size=15
color="red"></td>
</tr>
</table>
<br><br>
<input type="Submit" name="okbutton" value=" OK " >
<input type="button" name="cancelbutton" value=" Cancel "
onclick="window.close()">
</form>
</center>
</body>
<html>
The file web.xml is follows:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/j2ee/dtds/web-app_2_2.dtd";>
<web-app>
<servlet>
<servlet-name>
GetUserIdentity
</servlet-name>
<servlet-class>
GetUserIdentity
</servlet-class>
</servlet>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>
index.html
</welcome-file>
</welcome-file-list>
</web-app>
I use Tomcat to deploy my servlet,when I click the button OK in index.html,I got
errors:
Apache Tomcat/4.0.1 - HTTP Status 500 - Internal Server Error
type Exception report
message Internal Server Error
description The server encountered an internal error (Internal Server Error) that
prevented it from fulfilling this request.
exception
java.lang.ClassCastException: GetUserIdentity
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:820)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:615)
at org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServlet.java:396)
at org.apache.catalina.servlets.InvokerServlet.doPost(InvokerServlet.java:216)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:201)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2344)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:462)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:163)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1011)
at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1106)
at java.lang.Thread.run(Unknown Source)
Where is error in my file? I can't got from above error message. How to correct it?
Any idea will be appreciated!
Thanks!!!
Edward
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