Tomcat Servlet class not found issue

[Michael Portman]

Hello all.

I've setup a Tomcat file server on linux ubuntu and when I create a test servlet I get a class not found exception!

My servlet code:

package evo.net;

import java.io.*;
import java.util.*;

import javax.servlet.*;
import javax.servlet.http.*;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@WebServlet("/Servlet/servletTest")
public class servletTest extends HttpServlet {
	private static final long serialVersionUID = 1L;
	
	public servletTest() {
		super();
	}

    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		
		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		
		out.println("If you see this then Servlets are working!");
	}
}

I've created WEB-INF/classes/evo/net/ to where the servlet is stored.

My web.xml file (WEB-INF/web.xml):

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>
  <!--
   <multipart-config>

      <max-file-size>5368709120</max-file-size>
      <max-request-size>5368709120</max-request-size>
      <file-size-threshold>0<</file-size-threshold>

  </multipart-config>
   -->
    <!-- support for JEE cluster, remove this line if you want to put non-serializable objects into the java_session() -->

    <!-- Welcome files -->
    <welcome-file-list>
		<welcome-file>index</welcome-file>
        <welcome-file>index.php</welcome-file>
		<welcome-file>index.jsp</welcome-file>
    </welcome-file-list>

<servlet>
  <servlet-name>testServlet</servlet-name>
  <servlet-class>evo.net.testServlet</servlet-class>
</servlet>
<servlet-mapping>
  <servlet-name>testServlet</servlet-name>
  <url-pattern>/Servlet/*</url-pattern>
</servlet-mapping>
</web-app>

I've tried using annotations and without and still doesnt work. I've restarted server many times with no joy. Help appreciated.

[Tim Moores]

You have a typo:

evo.net.testServlet

public class servletTest extends HttpServlet

[Dave Tolls]

Since you have the servlet mapped using the WebServlet annotation you don't need it in the web.xml.
Indeed it might confuse matters (as here).

[Michael Portman]

Ok i sorted the typo now im getting a new error:

type Exception report

message evo/net/servletTest : Unsupported major.minor version 52.0 (unable to load class evo.net.servletTest)

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

exception

java.lang.UnsupportedClassVersionError: evo/net/servletTest : Unsupported major.minor version 52.0 (unable to load class evo.net.servletTest)
	org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2970)
	org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1209)
	org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1689)
	org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1570)
	org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
	org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
	org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
	org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
	org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
	org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313)
	java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	java.lang.Thread.run(Thread.java:745)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.52 (Ubuntu) logs.

[Bear Bibeault]

That means you are using two different versions of Java. Your Tomcat instance should be running the same version you are compiling with.

[Michael Portman]

Bear Bibeault wrote:That means you are using two different versions of Java. Your Tomcat instance should be running the same version you are compiling with.

OK. My project designer is linux literate as I dont know how to use it. he's gonna sort it hopefully, if not ill post back

[Tim Holloway]

Hint: on Linux and other Unix-like OS's (MacOS for example), the command "which javac" will tell you where the Java compiler that you are using is. If you're using Maven or Ant, the JAVA_HOME environment variable used to run Maven or Ant will specify it. The command "java -version" will tell you which version of Java your compiler outputs by default.

The JAVA_HOME environment variable is also one way to tell Tomcat which Java VM is to be used for executing Tomcat and its webapps.