Erro ao Gerar Relatorios Com JasperReports

Front-end
#1

Estou gerando relatorios utilizando Jasper reports, e está ocorrendo um exception ao utilizar o servletcontext() abaixo o codigo que gera os relatorios:

import java.util.HashMap;
import net.sf.jasperreports.engine.JasperExportManager;
import net.sf.jasperreports.engine.JasperFillManager;
import br.com.business.mysql.ConexaoMysql;
import java.io.IOException;
import java.sql.Connection;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.jasperreports.engine.JasperPrint;

/**
*

  • @author Alexandre
    */
    public class Relatorio extends HttpServlet{
    public void destroy() {
    super.destroy();
    }

    public void GerarRelatorio(HttpServletRequest request, HttpServletResponse response, String rel)
    throws ServletException, IOException {

     if(rel.equals("UsuariosPorNome")){
     response.setContentType("text/html;charset=UTF-8");
     try{
         
         Connection con = new ConexaoMysql().getConnection();
         HashMap parametros = new HashMap();
         ServletContext sc  =  getServletContext();
         sc.getInitParameter("db");
         String nomeArquivo = sc.getRealPath("/") + "jasper/usuarios_por_nome.pdf";
         JasperPrint jp = JasperFillManager.fillReport(sc.getRealPath("/jasper/usuarios_por_nome.jasper"),parametros ,con );
         JasperExportManager.exportReportToPdfFile(jp, nomeArquivo); 
         response.sendRedirect("usuarios.Por.Nome.jsp");							
     
     }catch (Exception e) {
         response.sendRedirect("falha.jsp"); 
     }          
 }

    }

    public void init() throws ServletException {

     super.init();

    }
    }

Estou usando o Netbeans 7.0 Abaixo a mensagem de erro:

INFO: Illegal access: this web application instance has been stopped already. Could not load com.mysql.jdbc.ProfilerEventHandlerFactory. The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1562)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1521)
at com.mysql.jdbc.ConnectionImpl.realClose(ConnectionImpl.java:4346)
at com.mysql.jdbc.ConnectionImpl.cleanup(ConnectionImpl.java:1348)
at com.mysql.jdbc.ConnectionImpl.finalize(ConnectionImpl.java:2679)
at java.lang.ref.Finalizer.invokeFinalizeMethod(Native Method)
at java.lang.ref.Finalizer.runFinalizer(Finalizer.java:83)
at java.lang.ref.Finalizer.access$100(Finalizer.java:14)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:160)
22/09/2011 11:37:55 org.apache.catalina.loader.WebappClassLoader loadClass
INFO: Illegal access: this web application instance has been stopped already. Could not load com.mysql.jdbc.SQLError. The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1562)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1521)
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3321)
at com.mysql.jdbc.MysqlIO.quit(MysqlIO.java:1667)
at com.mysql.jdbc.ConnectionImpl.realClose(ConnectionImpl.java:4322)
at com.mysql.jdbc.ConnectionImpl.cleanup(ConnectionImpl.java:1348)
at com.mysql.jdbc.ConnectionImpl.finalize(ConnectionImpl.java:2679)
at java.lang.ref.Finalizer.invokeFinalizeMethod(Native Method)
at java.lang.ref.Finalizer.runFinalizer(Finalizer.java:83)
at java.lang.ref.Finalizer.access$100(Finalizer.java:14)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:160)
22/09/2011 11:37:55 org.apache.catalina.loader.WebappClassLoader loadClass
INFO: Illegal access: this web application instance has been stopped already. Could not load com.mysql.jdbc.SQLError. The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1562)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1521)
at com.mysql.jdbc.ConnectionImpl.throwConnectionClosedException(ConnectionImpl.java:1193)
at com.mysql.jdbc.ConnectionImpl.getMutex(ConnectionImpl.java:3035)
at com.mysql.jdbc.ConnectionImpl.rollback(ConnectionImpl.java:4644)
at com.mysql.jdbc.ConnectionImpl.realClose(ConnectionImpl.java:4279)
at com.mysql.jdbc.ConnectionImpl.close(ConnectionImpl.java:1544)
at org.hibernate.connection.DriverManagerConnectionProvider.close(DriverManagerConnectionProvider.java:152)
at org.hibernate.connection.DriverManagerConnectionProvider.finalize(DriverManagerConnectionProvider.java:142)
at java.lang.ref.Finalizer.invokeFinalizeMethod(Native Method)
at java.lang.ref.Finalizer.runFinalizer(Finalizer.java:83)
at java.lang.ref.Finalizer.access$100(Finalizer.java:14)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:160)

O que pode ser???

#2