Olá a todos, estou tentando adaptar um exemplo de JSTL que pegue na apostila fj21 da Caelum, mas estou tendo alguns problemas, sempre aparece o seguinte erro:
Estou usando o Eclipse e tomcat 7 e colei os 2 Jar JSTL no lib do projeto e coloquei no path
org.apache.jasper.JasperException: An exception occurred processing JSP page /testeJSTL.jsp at line 8
5: <jsp:useBean id="dao" class="banco.DaoCi"/>
6: <table>
7: <!-- for -->
8: <c:forEach var="ci" items="${dao.lista}">
9: <tr>
10: <td>${ci.numero}</td>
11:
Esse é o meu codigo no JSP:
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<body>
<!-- cria a lista -->
<
</html>
Essa é meu metodo que chamo do DaoCi:
[code]
public List getLista() {
try {
List cis = new ArrayList();
PreparedStatement stmt = this.con.prepareStatement(“select * from ci”);
ResultSet rs = stmt.executeQuery();
while (rs.next()) {
// criando o objeto Contato
Ci ci = new Ci();
ci.setTitulo(rs.getString("titulo"));
ci.setNumero(rs.getInt("numero"));
cis.add(ci);
}
rs.close();
stmt.close();
return cis;
} catch (SQLException e) {
throw new RuntimeException(e);
}
}[/code]
O que pode ser? obrigada gente, estou começando agora
Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: An exception occurred processing JSP page /testeJSTL.jsp at line 8
5: <jsp:useBean id="dao" class="banco.DaoCi"/>
6: <table>
7: <!-- for -->
8: <c:forEach var="ci" items="${dao.lista}">
9: <tr>
10: <td>${ci.numero}</td>
11:
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:517)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:427)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
root cause
org.apache.jasper.el.JspELException: /testeJSTL.jsp(8,0) '${dao.lista}' Error reading 'lista' on type banco.DaoCi
org.apache.jasper.el.JspValueExpression.getValue(JspValueExpression.java:112)
org.apache.jsp.testeJSTL_jsp._jspx_meth_c_005fforEach_005f0(testeJSTL_jsp.java:99)
org.apache.jsp.testeJSTL_jsp._jspService(testeJSTL_jsp.java:70)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:73)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:378)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
root cause
java.lang.NullPointerException
banco.DaoCi.getLista(DaoCi.java:33)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
javax.el.BeanELResolver.getValue(BeanELResolver.java:64)
javax.el.CompositeELResolver.getValue(CompositeELResolver.java:55)
org.apache.el.parser.AstValue.getValue(AstValue.java:168)
org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:192)
org.apache.jasper.el.JspValueExpression.getValue(JspValueExpression.java:106)
org.apache.jsp.testeJSTL_jsp._jspx_meth_c_005fforEach_005f0(testeJSTL_jsp.java:99)
org.apache.jsp.testeJSTL_jsp._jspService(testeJSTL_jsp.java:70)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:73)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:378)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.0 logs.