Famous error: Conversion error when setting XXX value to 'null Converter'

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Famous error: Conversion error when setting XXX value to 'null Converter'

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Good afternoon.

I am with the famous error "Conversion error when setting XXX value to 'null Converter'." I have already seen several topics here and in other forums, Showcase of primefaces and I could not solve (in parts). In my application It has a user registry, inside it I have to save a Team (it's like a company outsourced) by a SelectOneMenu but at the time of saving gives the famous error. Well I'll put the codes:

Here's just the Dao method that lists teams and TeamDao:

@SuppressWarnings("unchecked")
    public List<Equipe> listar(){
        EntityManager manager = Persistence.createEntityManagerFactory("APRSAS").createEntityManager();
        javax.persistence.Query q =  (javax.persistence.Query) manager.createQuery("SELECT e FROM Equipe e");
        List<Equipe> equipes = ((javax.persistence.Query) q).getResultList();

        return equipes;
    }

Here Bean of User:

@Entity
public class Usuario implements Serializable{

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name="userId", unique=true, nullable=false)
    private Integer userId;

    @Column(name="ativo")
    private boolean ativo;

    @Column(name="userNome")
    private String userNome;

    @Column(name="login")
    private String login;

    @Column(name="senha")
    private String senha;

    @Column(name="email")
    private String email;

    @OneToOne(fetch = FetchType.LAZY)
    @PrimaryKeyJoinColumn
    private Equipe equipe;  

    @Column(name="permissaoAcesso")
    private int permissaoAcesso;    

//get set .....
}

The class responsible for loading the list :

@ManagedBean(name="equipeService", eager = true)
@SessionScoped
public class EquipeService {

    private List<Equipe> equipes;
    EquipeDao equipedao = new EquipeDao();  

    public List<Equipe> getEquipes() {
            equipes = equipedao.listar();
        return equipes;
    }
}

After the error I discovered that I had to create a convert , then I took this one from the Primefaces showcase :

@FacesConverter("equipeConverter")
public class EquipeConverter implements Converter {

    @Override
    public Object getAsObject(FacesContext fc, UIComponent uic, String value) {
        if(value != null && value.trim().length() > 0) {
            try {
                EquipeService service = (EquipeService) fc.getExternalContext().getApplicationMap().get("equipeService");
                return service.getEquipes().get(Integer.parseInt(value));
            } catch(NumberFormatException e) {
                throw new ConverterException(new FacesMessage(FacesMessage.SEVERITY_ERROR, "ERRO AO CARREGAR EQUIPES", "Equipe não encontrada."));
            }
        }
        else {
            return null;
        }
    }

    public String getAsString(FacesContext fc, UIComponent uic, Object object) {
        if(object != null) {
            return String.valueOf(((Equipe) object).getEquipeId());
        }
        else {
            return null;
        }
    }   
}

And the piece of xhtml that has selectonemenu :

<p:outputPanel id="displayEquipe1">
                    <p:outputLabel value="Equipe:"
                        rendered="#{usuarioAddEditMB.usuario.permissaoAcesso == '3'}" />
                </p:outputPanel>
                <p:outputPanel id="displayEquipe2">
                    <p:selectOneMenu id="Equipe"
                        value="#{usuarioAddEditMB.usuario.equipe}"
                        converter="equipeConverter"
                        rendered="#{usuarioAddEditMB.usuario.permissaoAcesso == '3'}"
                        style="width:125px">
                        <f:selectItem itemLabel="Selecione" itemValue="#{null}" />
                        <f:selectItems value="#{equipeService.equipes}" var="equipe"
                            itemLabel="#{equipe.equipeNome}" itemValue="#{equipe}" />
                    </p:selectOneMenu>
                </p:outputPanel>

(ignore that rendered, it's just a business rule)

After I created the conveter I did not load the page anymore and this error started: java.lang.String can not be cast to ... but in a topic in another forum I saw that I had to put a null in the itemValue , I did that and the page reloaded, so now when I give save it gives an error, strong> NULL , I do not know what to do to fix this.

Edited:

Please put the error as it is printed in the log. For, for example, see which method is firing the exception. @ Luigi

I took the itemvalue "# {null}" and left only the quotation marks, this error appeared:

Abr 09, 2017 5:36:13 PM com.sun.faces.context.AjaxExceptionHandlerImpl handlePartialResponseError
GRAVE: java.lang.ClassCastException: java.lang.String cannot be cast to br.com.sistemaaprsas.bean.Equipe
    at br.com.sistemaaprsas.converter.EquipeConverter.getAsString(EquipeConverter.java:34)
    at org.primefaces.renderkit.InputRenderer.getOptionAsString(InputRenderer.java:164)
    at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeOption(SelectOneMenuRenderer.java:345)
    at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeSelectItems(SelectOneMenuRenderer.java:331)
    at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeInput(SelectOneMenuRenderer.java:114)
    at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeMarkup(SelectOneMenuRenderer.java:91)
    at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeEnd(SelectOneMenuRenderer.java:65)
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:919)
    at org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:74)
    at org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:57)
    at org.primefaces.component.outputpanel.OutputPanelRenderer.encodeMarkup(OutputPanelRenderer.java:64)
    at org.primefaces.component.outputpanel.OutputPanelRenderer.encodeEnd(OutputPanelRenderer.java:40)
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:919)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1864)
    at com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback.visit(PartialViewContextImpl.java:582)
    at com.sun.faces.component.visit.PartialVisitContext.invokeVisitCallback(PartialVisitContext.java:183)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1690)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1701)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1701)
    at javax.faces.component.UIForm.visitTree(UIForm.java:371)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1701)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1701)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1701)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1701)
    at com.sun.faces.context.PartialViewContextImpl.processComponents(PartialViewContextImpl.java:403)
    at com.sun.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:322)
    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:1857)
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:432)
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:134)
    at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
    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:292)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
    at br.com.sistemaaprsas.filter.AuthFilter.doFilter(AuthFilter.java:39)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:94)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1104)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1519)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1475)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java

EDIT 2:

I have a search for ID in DAO :

public Equipe getById(int equipeid) {
        EntityManager manager = Persistence.createEntityManagerFactory("APRSAS").createEntityManager();
        Equipe equipe = null;
        try{

            equipe =  manager.find(Equipe.class, equipeid);
        } catch (Exception e) {
            e.printStackTrace();
        }

        return equipe;      
    }

I ended up changing my converter according to searches, I came up with this result:

@Override
public Object getAsObject(FacesContext fc, UIComponent uic, String value) {
    if (value != null && value.trim().length() > 0) {
        try {
            return new EquipeDao().getById(Integer.parseInt(value));
        } catch (NumberFormatException e) {
            throw new ConverterException(new FacesMessage(FacesMessage.SEVERITY_ERROR, "ERRO AO CARREGAR EQUIPES",
                    "Equipe não encontrada."));
        }
    } else {
        return null;
    }
}

public String getAsString(FacesContext fc, UIComponent uic, Object object) {
    if (object != null && object instanceof Equipe) {
        return ((Equipe) object).getEquipeId().toString();
    }
    return null;

}

But now it goes into throw:

throw new ConverterException(new FacesMessage(FacesMessage.SEVERITY_ERROR, "ERRO AO CARREGAR EQUIPES",
                        "Equipe não encontrada."));

java jsf java-ee front-end primefaces

asked by anonymous 09.04.2017 / 20:00

1 answer

Upload multiple files, but each one at a time? [closed] Relationship (Database) (Sql)

score 0 · Accepted Answer

A friend passed me a converter that worked, worked perfect follows:

@FacesConverter("equipeConverter")
public class EquipeConverter implements Converter {

    @Override
    public Object getAsObject(FacesContext fc, UIComponent uic, String value) {

        if (value == null || value.equals(""))
            return null;
        try {
            Long id = Long.valueOf(value);
            Collection items = (Collection) uic.getAttributes().get("items");
            return findById(items, id);
        } catch (Exception ex) {
            throw new ConverterException("Não foi possível aplicar conversão de item com valor [" + value
                    + "] no componente [" + uic.getId() + "]", ex);
        }

        /*
         * if (value != null && value.trim().length() > 0) { try { return new
         * EquipeDao().getById(Integer.parseInt(value)); } catch
         * (NumberFormatException e) { throw new ConverterException(new
         * FacesMessage(FacesMessage.SEVERITY_ERROR, "ERRO AO CARREGAR EQUIPES",
         * "Equipe não encontrada.")); } } else { return null; }
         */
    }

    @Override
    public String getAsString(FacesContext context, UIComponent component, Object value) {
        if (value == null)
            return "";
        return getIdByReflection(value).toString();
    }

    private Object findById(Collection collection, Long idToFind) {
        for (Object obj : collection) {
            Long id = getIdByReflection(obj);
            if (id == idToFind)
                return obj;
        }
        return null;
    }

    private Long getIdByReflection(Object bean) {
        try {
            Field idField = bean.getClass().getDeclaredField("equipeId");
            idField.setAccessible(true);
            return (Long) Long.valueOf(idField.get(bean).toString());
        } catch (Exception ex) {
            throw new RuntimeException("Não foi possível obter a propriedade 'equipeId' do item", ex);
        }
    }

}