HTTP Status 500 - type Exception report

[sini.sep87]

HTTP Status 500 -

type Exception report

message

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

exception

javax.servlet.ServletException: Wrapper cannot find servlet class GreetServlet or a class it depends on
org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:117)
org.apache.catalina.connector.CoyoteAdapter.servic e(CoyoteAdapter.java:174)
org.apache.coyote.http11.Http11Processor.process(H ttp11Processor.java:873)
org.apache.coyote.http11.Http11BaseProtocol$Http11 ConnectionHandler.processConnection(Http11BaseProt ocol.java:665)
org.apache.tomcat.util.net.PoolTcpEndpoint.process Socket(PoolTcpEndpoint.java:528)
org.apache.tomcat.util.net.LeaderFollowerWorkerThr ead.runIt(LeaderFollowerWorkerThread.java:81)
org.apache.tomcat.util.threads.ThreadPool$ControlR unnable.run(ThreadPool.java:689)
java.lang.Thread.run(Unknown Source)
root cause

java.lang.ClassNotFoundException: GreetServlet
org.apache.catalina.loader.WebappClassLoader.loadC lass(WebappClassLoader.java:1386)
org.apache.catalina.loader.WebappClassLoader.loadC lass(WebappClassLoader.java:1232)
org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:117)
org.apache.catalina.connector.CoyoteAdapter.servic e(CoyoteAdapter.java:174)
org.apache.coyote.http11.Http11Processor.process(H ttp11Processor.java:873)
org.apache.coyote.http11.Http11BaseProtocol$Http11 ConnectionHandler.processConnection(Http11BaseProt ocol.java:665)
org.apache.tomcat.util.net.PoolTcpEndpoint.process Socket(PoolTcpEndpoint.java:528)
org.apache.tomcat.util.net.LeaderFollowerWorkerThr ead.runIt(LeaderFollowerWorkerThread.java:81)
org.apache.tomcat.util.threads.ThreadPool$ControlR unnable.run(ThreadPool.java:689)
java.lang.Thread.run(Unknown Source)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.28 logs.

Apache Tomcat/5.5.28

[r035198x]

As you can see from the trace, the class called GreetServlet has not been found at all by tomcat. Do you have it? Have you added it to your application's classes folder?
P.S Better put your classes in packages rather than leaving them in the default package.

[sini.sep87]

thank u... i hav the class file in a folder called classes in web-inf... both classes folder n source folder r in web-inf... but still the error is class not found... y is it so??

[r035198x]

Put them in a package and also make sure their configuration is correct in the web.xml.

[sini.sep87]

i declared package now... but stil gettin the same error...
this is the servlet mappin in web.xml



<servlet>
<servlet-name>Myservlet</servlet-name>
<servlet-class>greet.GreetServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>Myservlet</servlet-name>
<url-pattern>/greetme</url-pattern>
</servlet-mapping>

<!-- JSPC servlet mappings end -->

</web-app>

[r035198x]

The error is still exactly the same?
That means your package update wasn't picked.
Stop the server, redeploy and start the server again.
When the redeploy is complete, check the webapps folder for your application and see if the class is indeed in the correct folder.

[sini.sep87]

i restarted tomcat...... GreetServlet class file is a package called greet in classes folder..

this is the error now


HTTP Status 404 - Servlet Myservlet is not available

type Status report

message Servlet Myservlet is not available

description The requested resource (Servlet Myservlet is not available) is not available.

Apache Tomcat/5.5.28

[r035198x]

How are you accessing it?
You should be accessing it using the mapping /greetme.
Did you also verify the stuff I asked you check above?

[sini.sep87]

yup.. accessin thru mappin /greetme... class file is in the right folder...

[r035198x]

Use

${pageContext.servletContext.contextPath}/greetme

for the servlet path.

[sini.sep87]

i didnt get... where shud use dat code

[r035198x]

In the JSP that is trying to invoke the servlet.
You are trying to invoke the servlet from a JSP, right?

[sini.sep87]

nope... its a simple servlet program... here is the code..

package greet;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;


public class GreetServlet extends HttpServlet
{
public void doGet(HttpServletRequest req,HttpServletResponse res) throws IOException,ServletException
{
String name = req.getParameter("uname");
String a = req.getParameter("age");
int age = Integer.parseInt(a);

PrintWriter out = res.getWriter();

out.println("<html> Hello "+name+" how r u ");

if(age<12)
out.println("U r a chotu");
else
out.println("U r not a chotu </html>");
}
}

and the html is

<html>
<body bgcolor="blue">
<form action=" " method="get">
<h3>Name : <input type="text" name="uname">
<br>
    Age  : <input type="text" age="age">
<br>
           <input type="submit" value="Click me"></h3>
</form>
</body>
</html>

[r035198x]

action=" " is not going to work. That page needs to be submitting to the servlet.
Otherwise how are you calling the servlet at all?
P.S Use the POST method if you are submitting data in the form for processing in the servlet.

[sini.sep87]

am not able to post urls here until i reach 20 posts so i left it blank.... actually i hav given the path.... am stil gettin the same error.... is der any mistake in servlet mapping?

<web-app>

<servlet>
<servlet-name>myServlet</servlet-name>
<servlet-class>greet.GreetServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>myServlet</servlet-name>
<url-pattern>/greetme</url-pattern>
</servlet-mapping>


</web-app>

[r035198x]

Use action="${pageContext.servletContext.contextPath}/greetme".
Make that page a JSP as well.