j2ee environment varaiable details

hi friends recently i installed jdk7, tomcat 7,j2ee6.If i run the j2se programs no problem but i run basicsevlet program hello world it show several error.please tell me the what is the environment variables i have changed. the program i typed is

import javax.sevlet.*;
import java.io.*;
public class helloworldservlet extends genericservlet
{
    public void service(servletRequest request,servletresponse response)throws IOException
     response.setcontenttype("text/html");
    printwriter out=response.getwriter();
    out.println("<html>");
    out.println("<body bgcolor=green>");
    out.println("<h1>hello world</h1>");
    out.prinln("</body>");
    out.println("</html>");
    out.close();
    }

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