My #PostConstruct method is getting called everytime I delete the last element of a dataTable in JSF - jsf

Question

I have a dataTable in JSF to show the phone numbers from a selected user.
Like the image below
My DataTable
In this dataTable I have a column with a commandLink to delete the element. The commandLink is working fine except in one particular case : If I delete the element of the last row and I try to delete any other element my #PostConstruct method is called again and it throws an exception. I concluded that the exception is being called because the param that contains the id of the user is null.
My question is why is this bug triggered only when I delete the last row of the dataTable ?
nov 28, 2022 11:36:54 AM com.sun.faces.application.view.FaceletViewHandlingStrategy handleRenderException
SEVERE: Error Rendering View[/telefone.xhtml]
com.sun.faces.mgbean.ManagedBeanCreationException: An error occurred performing resource injection on managed bean telefoneBean
at com.sun.faces.mgbean.BeanBuilder.invokePostConstruct(BeanBuilder.java:227)
at com.sun.faces.mgbean.BeanBuilder.build(BeanBuilder.java:103)
at com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:409)
at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:269)
at com.sun.faces.el.ManagedBeanELResolver.resolveBean(ManagedBeanELResolver.java:244)
at com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:116)
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.AstIdentifier.getValue(AstIdentifier.java:93)
at org.apache.el.parser.AstValue.getValue(AstValue.java:136)
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.ComponentStateHelper.eval(ComponentStateHelper.java:182)
at javax.faces.component.UIOutput.getValue(UIOutput.java:174)
at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:205)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:355)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:164)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:924)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:312)
at com.sun.faces.renderkit.html_basic.GridRenderer.renderRow(GridRenderer.java:185)
at com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:129)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:894)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:176)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:894)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)
at com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback.visit(PartialViewContextImpl.java:559)
at com.sun.faces.component.visit.PartialVisitContext.invokeVisitCallback(PartialVisitContext.java:183)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1689)
at javax.faces.component.UIForm.visitTree(UIForm.java:371)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
at com.sun.faces.context.PartialViewContextImpl.processComponents(PartialViewContextImpl.java:399)
at com.sun.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:319)
at org.primefaces.context.PrimePartialViewContext.processPartial(PrimePartialViewContext.java:57)
at javax.faces.component.UIViewRoot.encodeChildren(UIViewRoot.java:1004)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:417)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:687)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:890)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1743)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: com.sun.faces.spi.InjectionProviderException
at com.sun.faces.vendor.WebContainerInjectionProvider.invokeAnnotatedMethod(WebContainerInjectionProvider.java:115)
at com.sun.faces.vendor.WebContainerInjectionProvider.invokePostConstruct(WebContainerInjectionProvider.java:95)
at com.sun.faces.mgbean.BeanBuilder.invokePostConstruct(BeanBuilder.java:221)
... 65 more
Caused by: java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at com.sun.faces.vendor.WebContainerInjectionProvider.invokeAnnotatedMethod(WebContainerInjectionProvider.java:113)
... 67 more
Caused by: java.lang.NumberFormatException: null
at java.base/java.lang.Long.parseLong(Long.java:655)
at java.base/java.lang.Long.parseLong(Long.java:817)
at managedBean.TelefoneManagedBean.init(TelefoneManagedBean.java:42)
... 72 more
nov 28, 2022 11:36:54 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [Faces Servlet] in context with path [/pos-java-maven-hibernate] threw exception
java.lang.IllegalStateException: CDATA tags may not nest
at com.sun.faces.renderkit.html_basic.HtmlResponseWriter.startCDATA(HtmlResponseWriter.java:681)
at javax.faces.context.ResponseWriterWrapper.startCDATA(ResponseWriterWrapper.java:179)
at javax.faces.context.PartialResponseWriter.startError(PartialResponseWriter.java:341)
at org.primefaces.context.PrimePartialResponseWriter.startError(PrimePartialResponseWriter.java:116)
at com.sun.faces.context.AjaxExceptionHandlerImpl.handlePartialResponseError(AjaxExceptionHandlerImpl.java:200)
at com.sun.faces.context.AjaxExceptionHandlerImpl.handle(AjaxExceptionHandlerImpl.java:124)
at javax.faces.context.ExceptionHandlerWrapper.handle(ExceptionHandlerWrapper.java:100)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:119)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:687)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:890)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1743)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:829)
#PostConstruct
public void init() {
String codUser = FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap()
.get("codigouser");
daoUsuario = new DaoUsuario();
daoTelefone = new DaoTelefone();
telefone = new TelefoneUser();
usuario = daoUsuario.pesquisar(Long.parseLong(codUser), UsuarioPessoa.class);
lista = daoTelefone.consultarLista(usuario);
}
The code of my xhtml page
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.org/ui">
<h:head></h:head>
<h:body>
<h:form>
<p:breadCrumb>
<p:menuitem></p:menuitem>
<p:menuitem value="Pagina Index" action="index.jsf" />
<p:menuitem value="Pagina Primefaces" action="primefaces.jsf" />
</p:breadCrumb>
</h:form>
<h:form id="formulario">
<h:messages showDetail="true" showSummary="false" id="msg"></h:messages>
<h:panelGrid columns="2">
<h:outputLabel value="Usuário: " />
<h:outputText value="#{telefoneBean.usuario.nome}" />
<h:outputLabel value="ID " />
<h:inputText value="#{telefoneBean.telefone.id}" readonly="true" />
<h:outputLabel value="Numero: " />
<h:inputText value="#{telefoneBean.telefone.numero}" required="true" />
<h:outputLabel value="Tipo: " />
<h:inputText value="#{telefoneBean.telefone.tipo}" required="true" />
<h:commandButton value="Salvar" action="#{telefoneBean.salvar}" />
</h:panelGrid>
</h:form>
<h:form id="formularioTelefones">
<p:dataTable rowStatePreserved="true" value="#{telefoneBean.lista}"
id="tabelatelefones" var="tel">
<f:facet name="header">Lista de Telefones</f:facet>
<p:column>
<h:outputText value="#{tel.id}" />
<f:facet name="header">ID</f:facet>
</p:column>
<p:column>
<h:outputText value="#{tel.numero}" />
<f:facet name="header">Numero</f:facet>
</p:column>
<p:column>
<f:facet name="header">Tipo</f:facet>
<h:outputText value="#{tel.tipo}" />
</p:column>
<p:column>
<f:facet name="header">Deletar</f:facet>
<h:commandLink id="botaodeletar" action="#{telefoneBean.remover}">
<h:graphicImage url="resources/img/deletar.png" />
<f:setPropertyActionListener value="#{tel}"
target="#{telefoneBean.telefone}" />
<f:ajax execute="botaodeletar" render="#form :formulario:msg" />
</h:commandLink>
</p:column>
</p:dataTable>
</h:form>
</h:body>
</html>
I will explain the bug using this example, lets imagine I delete the row with id= 484.If I do this, I can delete any other row perfectly fine.
Now, lets say I delete the row 503. This row is going to be removed, but if I try to remove any other row my #PostConstruct method is going to be called again and it will throw an exception because the param "codigouser"(this is the param that gets the ID of the user I want) will be null, BUT I still am able to add another number to the list and if I do this the table starts working again (with the same conditions)...
.See the example of a dataTable
First I thought the problem was on the method that I use to delete the phone number in the DB. Then I thought the problem was on the method that I use to get the list of phone numbers in the DB. Then I noticed that this bug just happens when I refresh the values of the dataTable. If I dont refresh the values on the dataTable then everything works perfectly fine, but the problem of course is that the phone numbers I remove still show in the table because I didnt refreshed it.
Edit :
The managed bean class
package managedBean;
import java.io.Serializable;
import java.util.List;
import javax.annotation.PostConstruct;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;
import javax.faces.context.FacesContext;
import dao.DaoTelefone;
import dao.DaoUsuario;
import model.TelefoneUser;
import model.UsuarioPessoa;
#ManagedBean(name = "telefoneBean")
#ViewScoped
public class TelefoneManagedBean implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
private UsuarioPessoa usuario; // the user
private DaoUsuario daoUsuario; // dao to find the user in the database
private DaoTelefone daoTelefone; // dao to find the phone numbers in the data base
private TelefoneUser telefone; // Object used to save and delete the phone number
private List<TelefoneUser> lista; // list of phone numbers from the user
#PostConstruct
public void init() {
String codUser = FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap()
.get("codigouser"); // getting the user id
daoUsuario = new DaoUsuario();
daoTelefone = new DaoTelefone();
telefone = new TelefoneUser();
usuario = daoUsuario.pesquisar(Long.parseLong(codUser), UsuarioPessoa.class); // getting the user
lista = daoTelefone.consultarLista(usuario); // getting the list of phone numbers
}
public void setUsuario(UsuarioPessoa usuario) {
this.usuario = usuario;
}
public UsuarioPessoa getUsuario() {
return usuario;
}
public TelefoneUser getTelefone() {
System.out.println("telefone");
return telefone;
}
public String remover() throws Exception {
daoTelefone.deleteId(telefone);
FacesContext.getCurrentInstance().addMessage(null,
new FacesMessage(FacesMessage.SEVERITY_INFO, "Informação:", "Telefone removido."));
telefone = new TelefoneUser();
return "";
}
public String salvar() {
telefone.setPessoa(usuario);
daoTelefone.salvar(telefone);
telefone = new TelefoneUser();
FacesContext.getCurrentInstance().addMessage(null,
new FacesMessage(FacesMessage.SEVERITY_INFO, "Informação:", "Telefone Salvo."));
return "";
}
public void setTelefone(TelefoneUser telefone) {
this.telefone = telefone;
}
public DaoUsuario getDaoUsuario() {
return daoUsuario;
}
public void setDaoUsuario(DaoUsuario daoUsuario) {
this.daoUsuario = daoUsuario;
}
public DaoTelefone getDaoTelefone() {
return daoTelefone;
}
public void setDaoTelefone(DaoTelefone daoTelefone) {
this.daoTelefone = daoTelefone;
}
public List<TelefoneUser> getLista() {
lista = daoTelefone.consultarLista(usuario);
return lista;
}
public void setLista(List<TelefoneUser> lista) {
this.lista = lista;
}
}
The method used to remove the phone number :
public void deleteId(E entidade) throws Exception {
Object primaryKey = HibernateUtil.getPrimaryKey(entidade);
EntityTransaction transaction = entityManager.getTransaction();
transaction.begin();
entityManager.createNativeQuery("delete from "+entidade.getClass().getSimpleName().toLowerCase()+" where id="+primaryKey).executeUpdate();
transaction.commit();
}

Answer 1

In the comment section We found the problem. That was a rendering problem here:
<f:ajax execute="botaodeletar" render="#form :formulario:msg" />
Changed to this:
<f:ajax execute="#this" render=":formulario:msg :formularioTelefones:tabelatelefones" />