to tentando acessar a lista de contatos mas parece que o filtro está com problema.
o web.xml tá ssim:
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<filter>
<filter-name>FiltroConexao</filter-name>
<filter-class>pack.filtro.FiltroConexao</filter-class>
</filter>
<filter-mapping>
<filter-name>FiltroConexao</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>...
e a página que imprime tá assim:
[code]<%@taglib uri=“http://java.sun.com/jsp/jstl/core” prefix=“c”%>
<%@taglib uri=“http://java.sun.com/jsp/jstl/fmt” prefix=“fmt”%>
<c:import url=“header.jsp” />
Lista de Contatos
<jsp:useBean id=“dao” class=“pack.modelo.ContatoDAO” />
...[/code]
Olá
Poderia postar o stack do erro? Facilita a analise.
claro roberto 
segue:
[code]SEVERE: WebModule[/Listagem]PWC1270: Exception starting filter FiltroConexao
java.lang.InstantiationException
at org.apache.catalina.core.ApplicationFilterConfig.(ApplicationFilterConfig.java:124)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4685)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:5377)
at com.sun.enterprise.web.WebModule.start(WebModule.java:498)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:917)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:901)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:733)
at com.sun.enterprise.web.WebContainer.loadWebModule(WebContainer.java:2000)
at com.sun.enterprise.web.WebContainer.loadWebModule(WebContainer.java:1651)
at com.sun.enterprise.web.WebApplication.start(WebApplication.java:109)
at org.glassfish.internal.data.EngineRef.start(EngineRef.java:130)
at org.glassfish.internal.data.ModuleInfo.start(ModuleInfo.java:269)
at org.glassfish.internal.data.ApplicationInfo.start(ApplicationInfo.java:294)
at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:462)
at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:240)
at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:382)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$1.execute(CommandRunnerImpl.java:355)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:370)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1064)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1200(CommandRunnerImpl.java:96)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1244)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1232)
at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:459)
at com.sun.enterprise.v3.admin.AdminAdapter.service(AdminAdapter.java:209)
at com.sun.grizzly.tcp.http11.GrizzlyAdapter.service(GrizzlyAdapter.java:168)
at com.sun.enterprise.v3.server.HK2Dispatcher.dispath(HK2Dispatcher.java:117)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:238)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:828)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:725)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1019)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.ClassCastException: pack.filtro.FiltroConexao cannot be cast to javax.servlet.Filter
at com.sun.enterprise.web.WebContainer.createFilterInstance(WebContainer.java:733)
at com.sun.enterprise.web.WebModule.createFilterInstance(WebModule.java:1972)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:253)
at org.apache.catalina.core.ApplicationFilterConfig.(ApplicationFilterConfig.java:120)
… 40 more
INFO: WEB0671: Loading application [Listagem] at [/Listagem]
INFO: Listagem was successfully deployed in 971 milliseconds.
WARNING: StandardWrapperValve[jsp]: PWC1406: Servlet.service() for servlet jsp threw exception
java.lang.InstantiationException: class pack.modelo.ContatoDAO : java.lang.InstantiationException: pack.modelo.ContatoDAO
at org.apache.jsp.lista_002dcontatos_jsp._jspService(lista_002dcontatos_jsp.java:81)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:111)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:403)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:492)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:378)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1539)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)
at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:330)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:174)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:828)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:725)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1019)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:722)
[/code]
Olá
O seu classe FiltroConexao implementa Filter?
sim
[code]package pack.filtro;
import java.sql.;
import java.io.IOException;
import java.util.logging.Filter;
import java.util.logging.LogRecord;
import javax.servlet.;
import pack.jdbc.ConnectionFactory;
public class FiltroConexao implements Filter {…[/code]
Ih complicou… você já tentou rodar a aplicação retirando o jar que contem a interface Filter do WEB-INF/lib ?
(Não me lembro no nome do jar para lhe dizer)
no meu lib só tem isso:
commons-beanutils-1.8.3
commons-collections-3.2.1
commons-lang3-3.1
commons-logging-1.1.1
displaytag-1.2
jstl-1.2
log4j-1.2.12
Que estranho…
infelizmente não sei mais o que pode ser. Tomara que alguém saiba o que é 
Vc está implementando a interdace errado,
import java.util.logging.Filter;
em vez da,
import javax.servlet.Filter;
Acredito ser isso…
2 curtidas
