Http status 500

[rakesh kadulkar]

Hi i am referring the HFS servlets and jsp..
My question is that i have done the example in the 3rd chapter successfully on one pc but unable to do it on the other pc with the same softwares i.e.tomcat 5.5 and jdk 1.6.0 ..(on windows)
The error i m gating is for the first version of the servlet...
Though the browser is showing the form.html when i select the color and hit submit the error i get 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: 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:874)
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.UnsupportedClassVersionError: Bad version number in .class file
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:1853)
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:875)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1330)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1209)
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:874)
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/5.5.26 logs.

What is the cause and the solution ?

My code is :
For servlet:
package com.example.web;

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

public class BeerSelect extends HttpServlet{
public void doPost(HttpServletRequest request,HttpServletResponse response)throws IOException,ServletException{
response.setContentType("text/html");
String c=request.getParameter("color");
PrintWriter out=response.getWriter();
out.println("Selected Beer Color" + c);
}
}

[Paul Sturrock]

java.lang.UnsupportedClassVersionError: Bad version number in .class file

It looks like you have compiled your code with one version of Java and are trying to run it with another earlier version. Check which versions of the JDK you use to compile your code and run your servlet container.
[ August 08, 2008: Message edited by: Paul Sturrock ]

[rakesh kadulkar]

no friend i m using the same code compiled with the same version as i have installed jdk 1.6.0 today itsele and doing every thing now...
So no chances of happening what you said

Check if there is any other prblem and let me know immediately.
Thanks in advance

[Paul Sturrock]

Originally posted by rakesh kadulkar:
no friend i m using the same code compiled with the same version as i have installed jdk 1.6.0 today itsele and doing every thing now...
So no chances of happening what you said

Well, I'm afraid that is what is happening. Classes get their version number from the compiler, so your code is definitely being compiled by a version of the JDK that is not the same as the version you are running your servlet container in.

Check your build path. Check how you start your servlet container. How do both these things find the version of Java to use?

[Ragav Baskaran]

Try putting an echo statement for your JAVA_HOME variable.

echo %JAVA_HOME%

Thanks.

[rakesh kadulkar]

dude its not working i tried

[Ulf Dittmer]

What have you tried? What is not working? TellTheDetails

[rakesh kadulkar]

i tried this:
Try putting an echo statement for your JAVA_HOME variable.

echo %JAVA_HOME%

But doesnt worked..The error persists

[Steve Luke]

Here is another root. It looks like you are using Tomcat. In Tomcat's bin directory there should be an executable with a w in the name, like tomcat6w.exe. Use that to get at the Tomcat service monitor. Select the Java tab and it will tell you what Java Virtual Machine is being used to run the servlet container in.

Press the [...] button next to the JVM path and select the one that you used to compile your code.

If you have a different server or start Tomcat through an IDE you will have to read their documentation to figure out how to change the JVM used by the server.