Exemplo Primafaces Lazy Loading

evandro_araujo · Fevereiro 6, 2013, 10:55pm

Pessoal,

estou tentando implementar um exemplo do site do primafaces , mas esta dando o erro abaixo :

Grave: Error Rendering View[/index.xhtml]
com.sun.faces.mgbean.ManagedBeanCreationException: Não é possível criar instância para·a classe: org.primefaces.examples.view.TableBean.
at com.sun.faces.mgbean.BeanBuilder.newBeanInstance(BeanBuilder.java:193)
at com.sun.faces.mgbean.BeanBuilder.build(BeanBuilder.java:102)
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 com.sun.el.parser.AstIdentifier.getValue(AstIdentifier.java:103)
at com.sun.el.parser.AstValue.getValue(AstValue.java:179)
at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:224)
at org.jboss.weld.el.WeldValueExpression.getValue(WeldValueExpression.java:50)
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.UIData.getValue(UIData.java:731)
at org.primefaces.component.datatable.DataTable.getValue(DataTable.java:729)
at org.primefaces.component.api.UIData.getDataModel(UIData.java:575)
at org.primefaces.component.datatable.DataTable.loadLazyData(DataTable.java:596)
at org.primefaces.component.datatable.DataTableRenderer.encodeMarkup(DataTableRenderer.java:159)
at org.primefaces.component.datatable.DataTableRenderer.encodeEnd(DataTableRenderer.java:74)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1764)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:168)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1757)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1760)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1760)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:402)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:288)
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:594)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
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 org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$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.NullPointerException

segue abaixo meu codigo


<h:form id="form">  
  
    <p:dataTable var="car" value="#{tableBean.lazyModel}" paginator="true" rows="10"  
                 paginatorTemplate="{RowsPerPageDropdown} {FirstPageLink} {PreviousPageLink} {CurrentPageReport} {NextPageLink} {LastPageLink}"  
                 rowsPerPageTemplate="5,10,15" selectionMode="single" selection="#{tableBean.selectedCar}" id="carTable" lazy="true">  
  
        <p:ajax event="rowSelect" listener="#{tableBean.onRowSelect}" update=":form:display" oncomplete="carDialog.show()" />  
  
        <p:column headerText="Model" sortBy="#{car.model}" filterBy="#{car.model}">  
            <h:outputText value="#{car.model}" />  
        </p:column>  
  
        <p:column headerText="Year" sortBy="#{car.year}" filterBy="#{car.year}">  
            <h:outputText value="#{car.year}" />  
        </p:column>  
  
        <p:column headerText="Manufacturer" sortBy="#{car.manufacturer}" filterBy="#{car.manufacturer}">  
            <h:outputText value="#{car.manufacturer}" />  
        </p:column>  
  
        <p:column headerText="Color" sortBy="#{car.color}" filterBy="#{car.color}">  
            <h:outputText value="#{car.color}" />  
        </p:column>  
    </p:dataTable>  
  
    <p:dialog header="Car Detail" widgetVar="carDialog" resizable="false"  
              showEffect="explode" hideEffect="explode">  
  
        <h:panelGrid id="display" columns="2" cellpadding="4">  
  
            <f:facet name="header">  
                <p:graphicImage value="/images/cars/#{tableBean.selectedCar.manufacturer}.jpg"/>  
            </f:facet>  
  
            <h:outputText value="Model:" />  
            <h:outputText value="#{tableBean.selectedCar.model}" style="font-weight:bold"/>  
  
            <h:outputText value="Year:" />  
            <h:outputText value="#{tableBean.selectedCar.year}" style="font-weight:bold"/>  
  
            <h:outputText value="Manufacturer:" />  
            <h:outputText value="#{tableBean.selectedCar.manufacturer}" style="font-weight:bold"/>  
  
            <h:outputText value="Color:" />  
            <h:outputText value="#{tableBean.selectedCar.color}" style="font-weight:bold"/>  
        </h:panelGrid>  
    </p:dialog>  
  
</h:form>            
******** Bean

@ManagedBean
@ViewScoped
public class TableBean {
    
    private LazyDataModel<Car> lazyModel;  
  
    private Car selectedCar;  
  
    private List<Car> cars;  
    
      
        private final static String[] colors;
       
        private final static String[] manufacturers;

    
    
    static {  
        colors = new String[10];  
        colors[0] = "Black";  
        colors[1] = "White";  
        colors[2] = "Green";  
        colors[3] = "Red";  
        colors[4] = "Blue";  
        colors[5] = "Orange";  
        colors[6] = "Silver";  
        colors[7] = "Yellow";  
        colors[8] = "Brown";  
        colors[9] = "Maroon";  
        
        manufacturers = new String[10];  
        manufacturers[0] = "Mercedes";  
        manufacturers[1] = "BMW";  
        manufacturers[2] = "Volvo";  
        manufacturers[3] = "Audi";  
        manufacturers[4] = "Renault";  
        manufacturers[5] = "Opel";  
        manufacturers[6] = "Volkswagen";  
        manufacturers[7] = "Chrysler";  
        manufacturers[8] = "Ferrari";  
        manufacturers[9] = "Ford";  
    }  
    
 public TableBean() {  
        populateRandomCars(cars, 50);  
        lazyModel = new LazyCarDataModel(cars);  
    }  
  
    public Car getSelectedCar() {  
        return selectedCar;  
    }  
  
    public void setSelectedCar(Car selectedCar) {  
        this.selectedCar = selectedCar;  
    }  
      
    public LazyDataModel<Car> getLazyModel() {  
        return lazyModel;  
    }  
    private void populateRandomCars(List<Car> list, int size) {  
        for(int i = 0 ; i < size ; i++) {  
            list.add(new Car(getRandomModel(), getRandomYear(), getRandomManufacturer(), getRandomColor()));  
        }  
    }  
  
    private String getRandomColor() {  
        return colors[(int) (Math.random() * 10)];  
    }  
  
    private String getRandomManufacturer() {  
        return manufacturers[(int) (Math.random() * 10)];  
    }  
  
    private int getRandomYear() {  
        return (int) (Math.random() * 50 + 1960);  
    }      
    
     private String getRandomModel() {
                return UUID.randomUUID().toString().substring(0, 8);
        }

}


**********************

public class LazyCarDataModel extends LazyDataModel<Car>{
    private List<Car> datasource;  
    
    public LazyCarDataModel(List<Car> datasource) {  
        this.datasource = datasource;  
    }  
    
    
    @Override  
    public Object getRowKey(Car car) {  
        return car.getModel();  
    }  
  
    @Override  
    public List<Car> load(int first, int pageSize, String sortField, SortOrder sortOrder, Map<String,String> filters) {  
        List<Car> data = new ArrayList<Car>();  
  
        //filter  
        for(Car car : datasource) {  
            boolean match = true;  
  
            for(Iterator<String> it = filters.keySet().iterator(); it.hasNext();) {  
                try {  
                    String filterProperty = it.next();  
                    String filterValue = filters.get(filterProperty);  
                    String fieldValue = String.valueOf(car.getClass().getField(filterProperty).get(car));  
  
                    if(filterValue == null || fieldValue.startsWith(filterValue)) {  
                        match = true;  
                    }  
                    else {  
                        match = false;  
                        break;  
                    }  
                } catch(Exception e) {  
                    match = false;  
                }   
            }  
  
            if(match) {  
                data.add(car);  
            }  
        }  
  
        //sort  
    /*    if(sortField != null) {  
            Collections.sort(data, new LazySorter(sortField, sortOrder));  
        }  */
  
        //rowCount  
        int dataSize = data.size();  
        this.setRowCount(dataSize);  
  
        //paginate  
        if(dataSize > pageSize) {  
            try {  
                return data.subList(first, first + pageSize);  
            }  
            catch(IndexOutOfBoundsException e) {  
                return data.subList(first, first + (dataSize % pageSize));  
            }  
        }  
        else {  
            return data;  
        }  
    }  
    
}

Alguem pode me ajudar ???

d34d_d3v1l · Fevereiro 6, 2013, 11:18pm

no bean, tenta modificar oa tributo cars para:

 private List<Car> cars = new ArrayList<Car>();

e ve se funciona
vlw

Hebert_Coelho · Fevereiro 7, 2013, 2:07am

Novamente, aqui tem um exemplo que funciona: Lazy JSF Datatable Pagination (Primefaces)

Basta fazer a alteração que eu falei para você fazer no seu outro postt sobre o mesmo assunto.

evandro_araujo · Fevereiro 7, 2013, 10:35am

Hebert, obrigado pelas respostas, é que gostaria de implementar primeiro esse exemplo simples do prime, e vou ver o seu exemplo final de semana.

Marco fiz a alteração que me falou e deu o seguinte erro :

AVISO: Definindo valor de atributo não serializável em ViewMap (chave: tableBean, classe do valor: org.primefaces.examples.view.TableBean).
GRAVE: Error Rendering View[/index.xhtml]
java.lang.IllegalStateException: PWC3999: Cannot create a session after the response has been committed
at org.apache.catalina.connector.Request.doGetSession(Request.java:2886)
at org.apache.catalina.connector.Request.getSession(Request.java:2583)
at org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:920)
at

evandro_araujo · Fevereiro 7, 2013, 4:56pm

inclui na web.xml essa linha

com.sun.faces.writeStateAtFormEnd false

mas nao esta buscando a linha selecionado no p:dialog, conforme a imagem

Hebert_Coelho · Fevereiro 7, 2013, 4:58pm

[quote=evandro_araujo]inclui na web.xml essa linha

com.sun.faces.writeStateAtFormEnd false

mas nao esta buscando a linha selecionado no p:dialog, conforme a imagem

[/quote]E o que essa linha que você adicionou faz?

Não precisei fazer isso no exemplo do primefaces…

evandro_araujo · Fevereiro 7, 2013, 5:53pm

Hebert, peguei o exemplo neste site

Hebert_Coelho · Fevereiro 7, 2013, 5:55pm

[quote=evandro_araujo]Hebert, peguei o exemplo neste site

http://stackoverflow.com/questions/8072311/illegalstateexception-cannot-create-a-session-after-the-response-has-been-commi[/quote]Beleza, mas o que a linha faz?

Não adianta nada sair adicionando linhas ao código… Essa linha ajuda em que o seu problema?

evandro_araujo · Fevereiro 9, 2013, 2:57pm

Hebert tentei fazer da seguinte forma :

****************************view

        <h:form>
            <p:dataTable id="lazyDataTable" value="#{cadguiaMbean.dataModel}" var="cadusu" paginator="true" rows="10"
                         selection="#{cadguiaMbean.cadusu}" selectionMode="single"
				paginatorTemplate="{CurrentPageReport}  {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}"
				rowsPerPageTemplate="5,10,15" style="width: 80%;margin-left: 10%;margin-right: 10%;">

				<p:ajax event="rowSelect" update=":playerDialogForm" oncomplete="playerDetails.show()" />

				<p:column>
					<f:facet name="header">Name</f:facet>
                                        <h:outputText value="#{cadusu.nomeusu}" />
				</p:column>
			</p:dataTable>
		</h:form>

		<p:dialog widgetVar="playerDetails" header="Player" modal="true">
			<h:form id="playerDialogForm">
				<h:panelGrid columns="2">
					<h:outputText value="nome: " />
                                        <h:outputText value="#{cadguiaMbean.cadusu.nomeusu}" />
				</h:panelGrid>
			</h:form>
		</p:dialog>


***********************Bean 

@ManagedBean
@ViewScoped
public class CadguiaMbean extends ManagedBeanGenerico<Cadguia, CadguiaServico> implements Serializable {

    private List<Cadusu> cadusu;

    private LazyDataModel<Cadusu> dataModel;


    @Override
    public void iniciarView() {
        item = listaespec();       
        
        dataModel = new LazyDataModel<Cadusu>() {
            @Override
            public List<Cadusu> load(int startingAt, int maxPerPage, String sortField, SortOrder sortOrder, Map<String, String> filters) {
              cadusu= cadususervico.buscafindCadusu(startingAt, maxPerPage);
              
	      if (cadusu == null || cadusu.isEmpty()) {
                   cadususervico.buscacreate100Cadusu();
                   cadusu = cadususervico.buscafindCadusu(startingAt, maxPerPage);
              }
              
              
		// set the total of players
		if(getRowCount() <= 0){
                    ////Adaptei ...
			setRowCount(1);
		}
		
		// set the page dize
		setPageSize(maxPerPage);
              
              
                return cadusu;
            }
            
            
            @Override
	public Object getRowKey(Cadusu cadusu) {
		return cadusu.getCodusu();
	}
	
	@Override
	public Cadusu getRowData(String playerId) {
		Integer id = Integer.valueOf(playerId);
		
		for (Cadusu player : cadusu) {
			if(id.equals(player.getCodusu())){
				return player;
			}
		}
		
		return null;
	}

        };        
     
    }

Coloquei um breakpoint e nao entra na linha
abaixo :

        dataModel = new LazyDataModel<Cadusu>() {
            @Override
            public List<Cadusu> load(int startingAt, int maxPerPage, String sortField, SortOrder sortOrder,

Hebert_Coelho · Fevereiro 9, 2013, 3:24pm

Não tenho como te ajudar se não estiver igual lá.

Você está fazendo diferente e não estou podendo analisar seu código agora.

evandro_araujo · Fevereiro 10, 2013, 4:11pm

coloquei no meu datatable como LAZY=TRUE, agora esta entrando no LazyDataModel, porem esta dando o erro abaixo :

ava.util.Vector cannot be cast to br.uniplan.modelo.planouni.Cadusu
at br.uniplan.controle.CadguiaMbean$1.getRowKey(CadguiaMbean.java:94)
at org.primefaces.component.datatable.DataTable.getRowKeyFromModel(DataTable.java:783)
at org.primefaces.component.datatable.DataTable.findSelectedRowKeys(DataTable.java:831)
at org.primefaces.component.datatable.DataTableRenderer.encodeTbody(DataTableRenderer.java:574)
at org.primefaces.component.datatable.DataTableRenderer.encodeRegularTable(DataTableRenderer.java:220)
at org.primefaces.component.datatable.DataTableRenderer.encodeMarkup(DataTableRenderer.java:192)
at org.primefaces.component.datatable.DataTableRenderer.encodeEnd(DataTableRenderer.java:74)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1764)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:168)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1757)

system · Dezembro 30, 2015, 1:42pm

Exemplo Primafaces Lazy Loading

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