Olá pessoal, tenho um banco de dados já fixo, com algumas tabelas. Mais da um NullPointer quando vou apenas listar essa tabela em um dataTable… o código está assim.
Classe Model
public class Onibus implements Serializable{
private String numero;
private String titulo;
private String empresa;
private String saida;
private Integer intervalo_medio;
private String ultimo_horario;
private String madrugada;
///mais variaveis e Get's and Set's e eguals/Hashcode gerados
Meu Bean
@ManagedBean(name="onibusBean")
@RequestScoped
public class OnibusBean {
private Onibus onibus = new Onibus();
private List<Onibus> lista;
public List<Onibus> getLista() {
if (this.lista == null) {
OnibusRN onibusRN = new OnibusRN();
this.lista = onibusRN.listar();
}
return this.lista;
}
public Onibus getOnibus() {
return onibus;
}
public void setOnibus(Onibus onibus) {
this.onibus = onibus;
}
}
HibernateDAO
public class OnibusDAOHibernate implements OnibusDAO {
private Session session;
public void setSession(Session session) {
this.session = session;
}
@Override
public List<Onibus> listar() {
return this.session.createCriteria(Onibus.class).list();
}
}
Minha pagina…
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:p="http://primefaces.org/ui">
<ui:decorate template="/tema/padrao.xhtml">
<ui:define name="centro">
<h:form id="listagem">
<p:dataTable value="#{onibusBean.lista}" var="onibus"
rendered="#{!empty onibusBean.lista}">
<p:column headerText="Numero">
<h:outputText value="#{onibus.numero}" />
</p:column>
<p:column headerText="Titulo">
<h:outputText value="#{onibus.titulo}" />
</p:column>
<p:column headerText="Empresa">
<h:outputText value="#{onibus.empresa}" />
</p:column>
</p:dataTable>
</h:form>
</ui:define>
</ui:decorate>
</html>
Meu erro é esse…
java.lang.NullPointerException
at onibus.OnibusRN.listar(OnibusRN.java:19)
at bean.OnibusBean.getLista(OnibusBean.java:30)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at javax.el.BeanELResolver.getValue(BeanELResolver.java:87)
at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)
at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)
at org.apache.el.parser.AstValue.getValue(AstValue.java:169)
at org.apache.el.parser.AstEmpty.getValue(AstEmpty.java:47)
at org.apache.el.parser.AstNot.getValue(AstNot.java:44)
at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:189)
at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)
at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)
at javax.faces.component.UIComponentBase.isRendered(UIComponentBase.java:413)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1750)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:168)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845)
at org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:57)
at org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:45)
at org.primefaces.component.layout.LayoutUnitRenderer.encodeEnd(LayoutUnitRenderer.java:51)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1763)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1759)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1759)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1759)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:401)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:410)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at util.ConexaoHibernateFilter.doFilter(ConexaoHibernateFilter.java:32)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
Essa classe não está mapiada no hibernate.cfg.xml porque eu não quero que o Hibernate gera uma tabela pra mim…
O que eu poderia fazer nessa situação ?