Loja Virtual completa - aulas 35/36/37 - erro - javax.faces.el.EvaluationException: java.lang.NullPointerException
16/03/2011
0
Está ocorrendo erro de javax.faces.el.EvaluationException: java.lang.NullPointerException quando roda o seguinte código :
package br.com.face;
import br.com.entity.Category;import br.com.session.ProductSession;import java.util.List;import javax.enterprise.context.RequestScoped;import javax.inject.Inject;import javax.inject.Named;
public class BaseCDIBean<T> implements java.io.Serializable {
private static final long serialVersionUID = 1L;
private T selectedBean; @PersistenceContext protected EntityManager em;
public T getSelectedBean() { return selectedBean; }
public void setSelectedBean(T selectedBean) { this.selectedBean = selectedBean; }
}
@Named@RequestScopedpublic class CategoryFace extends BaseCDIBean<Category>{
private static final long serialVersionUID = 1L;
@Inject private ProductSession bean; private List<Category> list;
public String doListCategory(){ list = bean.getAllCategory(); return "/admin/category/list.faces"; }
ERRO:
javax.faces.el.EvaluationException: java.lang.NullPointerException at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102) at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102) at javax.faces.component.UICommand.broadcast(UICommand.java:315) at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:775) at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1267) at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:82) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:312) at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:215) at br.com.filters.AdminAuthFilter.doFilter(AdminAuthFilter.java:71) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:215) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:277) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641) at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97) at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185) at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:325) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:226) at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165) at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791) at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693) at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954) at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170) at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88) at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76) at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53) at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57) at com.sun.grizzly.ContextTask.run(ContextTask.java:69) at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330) at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309) at java.lang.Thread.run(Thread.java:662)Caused by: java.lang.NullPointerException at br.com.face.CategoryFace.doListCategory(CategoryFace.java:31) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.sun.el.parser.AstValue.invoke(AstValue.java:234) at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297) at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:98) at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88) ... 37 more
Agradeço a ajuda...Obrigado!
Noésio Souza
Posts
17/03/2011
Robson Teixeira
verifique a instacia de ProductSession pois pelo que parece aconteceu foi NUllPointer e não ta tendo instancia verifique isso e reveja como configurou o mesmo ok??
digo isso pois e o que o stacktrace postado por você diz.
att
robson Passarella
17/03/2011
Noésio Souza
Para funcionar o bean, implemntei no construtor do CategoryFace código da seguinte forma :
@Named@RequestScopedpublic class CategoryFace extends BaseCDIBean<Category>{
private static final long serialVersionUID = 1L;
@Inject private ProductSession bean; private List<Category> list;
public CategoryFace(){ this.bean = new ProductSession(); }
seria essa a forma?
O bean funcionou, mas não grava a categoria, é apresentada uma mensagem dizendo que Category não é uma entidade.
Segue o erro :
javax.faces.el.EvaluationException: java.lang.IllegalArgumentException: Object: br.com.entity.Category[id=null] is not a known entity type.
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
at javax.faces.component.UICommand.broadcast(UICommand.java:315)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:775)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1267)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:82)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:312)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:215)
at br.com.filters.AdminAuthFilter.doFilter(AdminAuthFilter.java:71)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:277)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:325)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:226)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.IllegalArgumentException: Object: br.com.entity.Category[id=null] is not a known entity type.
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.registerNewObjectForPersist(UnitOfWorkImpl.java:4141)
at org.eclipse.persistence.internal.jpa.EntityManagerImpl.persist(EntityManagerImpl.java:368)
at br.com.session.ProductSession.saveCategory(ProductSession.java:92)
at br.com.face.CategoryFace.doFinishCreateCategory(CategoryFace.java:54)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.el.parser.AstValue.invoke(AstValue.java:234)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:98)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
... 37 more
Segue o código :
@Named@RequestScopedpublic class CategoryFace extends BaseCDIBean<Category>{... public String doCreateCategory(){ setSelectedBean(new Category()); return "/admin/category/add.faces"; }
public String doFinishCreateCategory(){ bean.saveCategory(getSelectedBean()); return doListCategory(); }...
@Stateless@TransactionManagement(TransactionManagementType.CONTAINER)@TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)public class ProductSession extends BasicSessionBean{
public ProductSession(){ }
... public Category saveCategory(Category cat){ getEm().persist(cat); return cat; }...
public abstract class BasicSessionBean implements Serializable{
private static final long serialVersionUID = 1L;
EntityManagerFactory emf = Persistence.createEntityManagerFactory("EcommerceJPAPU"); @PersistenceContext private EntityManager em = emf.createEntityManager();
public EntityManager getEm() { return em; }...
@Entity@Table(name="category")public class Category implements Serializable { private static final long serialVersionUID = 1L; @Id @GeneratedValue(strategy = GenerationType.AUTO) @Column(name="id") @Basic(optional=false) private Integer id; @NotNull() @NotEmpty() @Column(name="name",nullable=false,unique=true) private String name; @Column(name="active") private boolean active = true;...
Obrigado!
18/03/2011
Davi Costa
Você está tentando injetar e instanciar ao mesmo tempo esse objeto, para testar talvez se remover essa anotação funcione, mas não é o ideal, a solução mais elegante é tentar ver o que pode estar errado nessa configuração que não está injetando o "em" 100%.
Att Davi
20/03/2011
Noésio Souza
Eu não manjo muito de EJB, vou baixar vídeo aula para entender sobre configurações e descobrir porque não esta acontecendo a injeção.Você tem algumas dicas para mapear esse tipo de problema?
Valeu!
21/03/2011
Davi Costa
O netBeans faz essa configuração toda automática.
Att Davi
22/03/2011
Noésio Souza
DE :
@Inject
private ProductSession bean;
PARA :
@EJB
private ProductSession bean;
Na video aula eu percebi que session bean sempre é anotado com @EJB, então resolvi trocar já que ProductSession(extends BasicSessionBean) é um session bean e deu certo, só não entendi porque essa anotação não funcionou.
Valeu!
22/03/2011
Davi Costa
Att Davi
25/03/2011
Dyego Carmo
Mas o mais importante foi resolvido :D
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