Boa noite pessoal.
Eu e meu grupo de tcc estamos apanhando com a seguinte situação:
Temos um atributo List<Produto> na entity ListaCompras, que quando damos um persist é salvo no cascade.
Nossa dificuldade está em recuperar essa List, já que pelo relacionamento @OneToMany, ele criou uma tabela lista_compras_produto.
Qual seria a JPA que devemos criar para recuperar essa lista?
Obs: Estamos usando JBoss Seam 2.1 e JPA com Hibernate.
Seguem as classes:
Produto.java
package br.com.e2u.entity;
import java.io.Serializable;
import java.util.Calendar;
import java.util.Date;
import javax.persistence.Basic;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Lob;
import javax.persistence.ManyToOne;
import javax.persistence.SequenceGenerator;
import javax.persistence.Transient;
import org.jboss.seam.annotations.Name;
import br.com.e2u.util.DataHora;
@Name("produto")
@Entity
public class Produto implements Serializable{
private static final long serialVersionUID = 2375123736077052214L;
private Integer id;
private String codigo;
private String categoria;
private String nome;
private String descricao;
private Double valor;
private Double valorPromocional;
private Calendar validadeValorPromocional;
private Double valorVigente;
private byte[] imagem;
private String tipo;
private Usuario mantenedor;
private Integer quantidade;
public Produto() {}
@Id
@SequenceGenerator(name="produto_seq_id", sequenceName="produto_seq_id")
@GeneratedValue(generator="produto_seq_id", strategy=GenerationType.AUTO)
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getCodigo() {
return codigo;
}
public void setCodigo(String codigo) {
this.codigo = codigo;
}
public String getCategoria() {
return categoria;
}
public void setCategoria(String categoria) {
this.categoria = categoria;
}
public String getNome() {
return nome;
}
public void setNome(String nome) {
this.nome = nome;
}
public String getDescricao() {
return descricao;
}
public void setDescricao(String descricao) {
this.descricao = descricao;
}
public Double getValor() {
return valor;
}
public void setValor(Double valor) {
this.valor = valor;
}
@Column(name="valor_promocional")
public Double getValorPromocional() {
return valorPromocional;
}
public void setValorPromocional(Double valorPromocional) {
this.valorPromocional = valorPromocional;
}
@Column(name="validade_valor_promocional")
public Calendar getValidadeValorPromocional() {
return validadeValorPromocional;
}
public void setValidadeValorPromocional(Calendar validadeValorPromocional) {
this.validadeValorPromocional = validadeValorPromocional;
}
@Transient
public Double getValorVigente() {
if((validadeValorPromocional == null) || (validadeValorPromocional.before(DataHora.getData(new Date(), "yyyy-MM-dd hh:mm")))){
valorVigente = valor;
}else{
valorVigente = valorPromocional;
}
return valorVigente;
}
public void setValorVigente(Double valorVigente) {
this.valorVigente = valorVigente;
}
@Lob
@Basic(fetch=FetchType.LAZY)
public byte[] getImagem() {
return imagem;
}
public void setImagem(byte[] imagem) {
this.imagem = imagem;
}
@Column(name="tipo_arquivo")
public String getTipo() {
return tipo;
}
public void setTipo(String tipo) {
this.tipo = tipo;
}
@ManyToOne(cascade=CascadeType.ALL)
public Usuario getMantenedor() {
return mantenedor;
}
public void setMantenedor(Usuario mantenedor) {
this.mantenedor = mantenedor;
}
@Transient
public Integer getQuantidade() {
return quantidade;
}
public void setQuantidade(Integer quantidade) {
this.quantidade = quantidade;
}
}ListaCompras.java
package br.com.e2u.entity;
import java.io.Serializable;
import java.util.Date;
import java.util.List;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
import org.jboss.seam.annotations.Name;
@Entity
@Name("listaCompras")
@Table(name="lista_compras")
public class ListaCompras implements Serializable {
private static final long serialVersionUID = -5947131327037577828L;
private Integer id;
private Usuario usuario;
private String nomeLista;
private String descricao;
private Date validadeLista;
private List<Produto> itens;
public ListaCompras() {}
@Id
@SequenceGenerator(name="lista_compras_id_seq", sequenceName="lista_compras_id_seq")
@GeneratedValue(generator="lista_compras_id_seq", strategy=GenerationType.AUTO)
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
@OneToOne(cascade=CascadeType.ALL,fetch=FetchType.LAZY)
public Usuario getUsuario() {
return usuario;
}
public void setUsuario(Usuario usuario) {
this.usuario = usuario;
}
@Column(name="nome_lista")
public String getNomeLista() {
return nomeLista;
}
public void setNomeLista(String nomeLista) {
this.nomeLista = nomeLista;
}
public String getDescricao() {
return descricao;
}
public void setDescricao(String descricao) {
this.descricao = descricao;
}
@Column(name="validade_lista")
public Date getValidadeLista() {
return validadeLista;
}
public void setValidadeLista(Date validadeLista) {
this.validadeLista = validadeLista;
}
@OneToMany(cascade=CascadeType.ALL)
public List<Produto> getItens() {
return itens;
}
public void setItens(List<Produto> itens) {
this.itens = itens;
}
}No managedBean, estamos tentando algo parecido com:
@Factory("itens")
public void listarItensLista(){
//if(!listaCompras.getNomeLista().equalsIgnoreCase("")){
/*Query query = entityManager.createQuery("from ListaCompras.itens lci where id = ?1");
query.setParameter(1, itens.get(0).getId());
List<Produto> prod = query.getResultList();
*/
List<Produto> prod = entityManager.createQuery("itens from ListaCompras lc").getResultList();
for (Produto produto : prod) {
itens.add(produto);
}
//}
}O erro:
20:09:58,149 ERROR [PARSER] line 1:1: unexpected token: itens
20:09:58,149 ERROR [viewhandler] Error Rendering View[/xhtml/lista_compras/itens_lista_compras_edit.xhtml]
java.lang.IllegalArgumentException: node to traverse cannot be null!
at org.hibernate.hql.ast.util.NodeTraverser.traverseDepthFirst(NodeTraverser.java:55)
at org.hibernate.hql.ast.QueryTranslatorImpl.parse(QueryTranslatorImpl.java:277)
at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:180)
at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:134)
at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:101)
at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:80)
at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:94)
at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:156)
at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:135)
at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1650)
at org.hibernate.ejb.AbstractEntityManagerImpl.createQuery(AbstractEntityManagerImpl.java:93)
at org.jboss.seam.persistence.EntityManagerProxy.createQuery(EntityManagerProxy.java:81)
at br.com.e2u.session.ListaComprasItensManager.listarItensLista(ListaComprasItensManager.java:89)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.seam.util.Reflections.invoke(Reflections.java:22)
at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:31)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56)
at org.jboss.seam.transaction.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:28)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:77)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.core.ConversationInterceptor.aroundInvoke(ConversationInterceptor.java:65)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:44)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107)
at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:185)
at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:103)
at br.com.e2u.session.ListaComprasItensManager_$$_javassist_9.listarItensLista(ListaComprasItensManager_$$_javassist_9.java)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.seam.util.Reflections.invoke(Reflections.java:22)
at org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:144)
at org.jboss.seam.Component.callComponentMethod(Component.java:2211)
at org.jboss.seam.Component.getInstanceFromFactory(Component.java:2043)
at org.jboss.seam.Component.getInstance(Component.java:1978)
at org.jboss.seam.Component.getInstance(Component.java:1950)
at org.jboss.seam.Component.getInstance(Component.java:1944)
at org.jboss.seam.Namespace.getComponentInstance(Namespace.java:55)
at org.jboss.seam.Namespace.getComponentInstance(Namespace.java:50)
at org.jboss.seam.el.SeamELResolver.resolveBase(SeamELResolver.java:166)
at org.jboss.seam.el.SeamELResolver.getValue(SeamELResolver.java:53)
at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54)
at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:72)
at org.jboss.el.parser.AstIdentifier.getValue(AstIdentifier.java:44)
at org.jboss.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:71)
at javax.faces.component.UIData.getValue(UIData.java:609)
at javax.faces.component.UIData.getDataModel(UIData.java:1124)
at javax.faces.component.UIData.setRowIndex(UIData.java:451)
at com.sun.faces.renderkit.html_basic.TableRenderer.encodeBegin(TableRenderer.java:77)
at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:813)
at javax.faces.component.UIData.encodeBegin(UIData.java:962)
at org.ajax4jsf.renderkit.RendererBase.renderChild(RendererBase.java:280)
at org.ajax4jsf.renderkit.RendererBase.renderChildren(RendererBase.java:262)
at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:220)
at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:215)
at org.ajax4jsf.renderkit.RendererBase.encodeChildren(RendererBase.java:121)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:234)
at com.sun.faces.renderkit.html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:106)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:234)
at com.sun.faces.renderkit.html_basic.GridRenderer.renderRow(GridRenderer.java:180)
at com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:127)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
at org.ajax4jsf.renderkit.RendererBase.renderChild(RendererBase.java:282)
at org.ajax4jsf.renderkit.RendererBase.renderChildren(RendererBase.java:262)
at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:220)
at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:215)
at org.ajax4jsf.renderkit.RendererBase.encodeChildren(RendererBase.java:121)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:930)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:148)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:930)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:933)
at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:592)
at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:108)
at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:196)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:266)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
at org.jboss.seam.web.IdentityFilter.doFilter(IdentityFilter.java:40)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:90)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:177)
at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:267)
at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:380)
at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:507)
at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:56)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.web.HotDeployFilter.doFilter(HotDeployFilter.java:53)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:601)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)
20:09:58,196 ERROR [PARSER] line 1:1: unexpected token: itensEstamos realmente com muita dificuldade, quem puder ajudar ficaremos gratos e prometemos postar aqui a solução.