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Logging Servlet with log4j

import javax.servlet.*; import javax.servlet.http.*; import java.io.PrintWriter; import java.io.IOException; import org.apache.log4j.*; public class LoggingServlet extends HttpServlet {     private static Logger logger = Logger.getLogger(LoggingServlet.class);     public void doPost(HttpServletRequest req, HttpServletResponse res)                        throws IOException, ServletException     {         logger.info("invoked the LoggingServlet...");         PrintWriter writer = res.getWriter();         writer.println("Check your web server console...");         writer.flush();         writer.close();     } }