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My first servlet - failed

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ITAppser

ITAppser

Technical User
Nov 12, 2001
3
SG
Dear all,

this is my first servlet. simple and short. compiled without error. But failed when called.

file content::
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class prt extends HttpServlet
{
public void doGet (HttpServletRequest request,
HttpServletResponse response)
{

try{
PrintWriter out=null;
out = response.getWriter();
out.print(&quot;<HTML><HEAD><TITLE>&quot;);
out.print(&quot;</TITLE></HEAD><BODY>&quot;);
out.print(&quot;<H1>Hi</H1>&quot;);
out.print(&quot;<P>This is the line&quot;);
out.print(&quot;</BODY></HTML>&quot;);
}catch (Exception e)
{
System.out.println(&quot;Err:&quot; + e.getMessage());
}
}

public void doPost (HttpServletRequest request,
HttpServletResponse response)
{
try{
PrintWriter out=null;
out = response.getWriter();
out.print(&quot;<HTML><HEAD><TITLE>&quot;);
out.print(&quot;</TITLE></HEAD><BODY>&quot;);
out.print(&quot;<H1>Hi</H1>&quot;);
out.print(&quot;<P>This is the line.&quot;);
out.print(&quot;</BODY></HTML>&quot;);
}catch (Exception e)
{
System.out.println(&quot;Err: &quot; + e.getMessage());
}
}
}

error::
java.lang.NullPointerException
at java.lang.ClassLoader.resolveClass0(Native Method)
at java.lang.ClassLoader.resolveClass(Unknown Source)
at org.apache.tomcat.loader.AdaptiveClassLoader.loadClass(AdaptiveClassLoader.java, Compiled Code)
at org.apache.tomcat.loader.AdaptiveServletLoader.loadClass(AdaptiveServletLoader.java:174)
at org.apache.tomcat.core.ServletWrapper.loadServlet(ServletWrapper.java:265)
at org.apache.tomcat.core.ServletWrapper.init(ServletWrapper.java:289)
at org.apache.tomcat.core.Handler.service(Handler.java:254)
at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
at org.apache.tomcat.service.connector.Ajp12ConnectionHandler.processConnection(Ajp12ConnectionHandler.java:166)
at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java, Compiled Code)
at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java, Compiled Code)
at java.lang.Thread.run(Unknown Source)

What could be wrong? Java is platform indepedent and jdk used is ver1.2.2. Wrong coding? Please kindly advise.
 
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How have you deployed the servlet to Tomcat and how are you calling it?
 
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