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posted 14 years ago

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I am not able to generate class file for the servlet java codes. I am able to do all the other normal java stuff. My tomcat is in F directory and its functioning well as well.

This is my code

package classes;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

public class calci extends HttpServlet
{

public void doPost(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException {

int num1=Integer.parseInt(req.getParameter("N1"));
int num2=Integer.parseInt(req.getParameter("N2"));

res.setContentType("text/html");
PrintWriter out=res.getWriter();
out.println(num1+num2);
}
}

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Vinod K Singh

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Posts: 198

posted 14 years ago

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What error you are facing?

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karthick Soundararaj

Greenhorn

Posts: 26

posted 14 years ago

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Vinod K Singh wrote:What error you are facing?

The error i get is
package javax.servlet.* does not exist.
package javax.servlet.http.* does not exist.

The tomcat location is F:/tomcat

My OS is in C drive,,,

Can path be a problem?

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Christophe Verré

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posted 14 years ago

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Tomcat's JAR files are not in your classpath. Check this FAQ.

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karthick Soundararaj

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posted 14 years ago

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I got my previous problem solved.. thanks for the reply.. now a new problem has come...

This is the error i get in the browser

STATUS REPORT 500
type Exception report

message

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

exception

javax.servlet.ServletException: Error allocating a servlet instance
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
java.lang.Thread.run(Unknown Source)
root cause

java.lang.NoClassDefFoundError: calci (wrong name: classes/calci)
java.lang.ClassLoader.defineClass1(Native Method)
java.lang.ClassLoader.defineClass(Unknown Source)
java.security.SecureClassLoader.defineClass(Unknown Source)
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1876)
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:889)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1353)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1232)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.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/5.5.27 logs.

the following is my source code

Calculator.html

<html>
<head>
<title> Calculator</title>
</head>

<body>

<form method="POST" action="calcul.do">
<center><font type="monotype corsiva" size=15>
<italics>Calculator</italic>
</font>
<br><br><br><br>
Number 1: <input name="N1" type=text> <br><br>
Number 2: <input name="N2" type=text> <br><br>
<input type="Submit"></center>
</form></body>
<html>

web.xml

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">

<servlet>
<servlet-name>Ch3 Beer </servlet-name>
<servlet-class>calci</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>Ch3 Beer </servlet-name>
<url-pattern>/calcul.do</url-pattern>
</servlet-mapping>

</web-app>

calci.java (no compilation error/warnings)

package classes;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

public class calci extends HttpServlet
{

public void doPost(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException {

int num1=Integer.parseInt(req.getParameter("N1"));
int num2=Integer.parseInt(req.getParameter("N2"));

res.setContentType("text/html");
PrintWriter out=res.getWriter();
out.println(num1+num2);
}
}

My deployment structure is:

F:\Tomcat\webapps\Calculator\calculator.html
F:\Tomcat\webapps\Calculator\WEB-INF\web.xml
F:\Tomcat\webapps\Calculator\WEB-INF\classes\calci.java

Frustrated yet determined.. please do help...

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Mohamed Inayath

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Posts: 124

posted 14 years ago

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If you could see in the error stack trace, its saying java.lang.NoClassDefFoundError: calci (wrong name: classes/calci)

And if you see web.xml you have defined the servlet class as :

Which should be

Besides the class name should start with a Capital letter.

karthick Soundararaj

Greenhorn

Posts: 26

posted 14 years ago

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Mohamed Inayath wrote:If you could see in the error stack trace, its saying java.lang.NoClassDefFoundError: calci (wrong name: classes/calci)

And if you see web.xml you have defined the servlet class as :
<servlet-class>calci</servlet-class>

Which should be
<servlet-class>classes.calci</servlet-class>

Besides the class name should start with a Capital letter.

Changed both

now the error is

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 classes.Calci or a class it depends on
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
java.lang.Thread.run(Unknown Source)
root cause

java.lang.ClassNotFoundException: classes.Calci
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1386)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1232)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.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/5.5.27 logs.

Apache Tomcat/5.5.27

calculator.html --> No changes

Calci.java

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

public class Calci extends HttpServlet
{

public void doPost(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException {

int num1=Integer.parseInt(req.getParameter("N1"));
int num2=Integer.parseInt(req.getParameter("N2"));

res.setContentType("text/html");
PrintWriter out=res.getWriter();
out.println(num1+num2);
}
}

web.xml

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">

<servlet>
<servlet-name>Ch3 Beer </servlet-name>
<servlet-class>classes.Calci</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>Ch3 Beer </servlet-name>
<url-pattern>/calcul.do</url-pattern>
</servlet-mapping>

</web-app>

No changes made to the location

Hitting my keys with atmost desparation

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karthick Soundararaj

Greenhorn

Posts: 26

posted 14 years ago

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Thanks a lot everyone.. The only error was the fact that class name was in lowercase rather than Sentence case. The path name is just Calci not classes.Calci

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Mohamed Inayath

Ranch Hand

Posts: 124

posted 14 years ago

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Good.

But your earlier attachment wrt the calci.java says a package definition : classes.

This time I believe you have removed that.

karthick Soundararaj

Greenhorn

Posts: 26

posted 14 years ago

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Mohamed Inayath wrote:Good.

But your earlier attachment wrt the calci.java says a package definition : classes.

This time I believe you have removed that.

Thing is the statement package classes.Calci itself is wrong statements.. please do look at my location i have mentioned in one of my earlier posts..

Anyways your input regarding the Capital letter was helpful

A java addict

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