Boa tarde amigos.
Pesquisei aqui no forúm e não encontrei um caso como este.
Se alguem puder me ajudar…
Meu problema é simples de entender.
@Entity
public class Grupo {
@Id
@GeneratedValue
private Long id;
private String nome;
@ManyToOne
@JoinColumn(name="idGrupoPai")
private Grupo grupoPai = new Grupo();
...Tenho uma clase Grupo e um objeto grupoPai do tipo Grupo.
Quero esse idGrupoPai, porque um Grupo pertence a um outro Grupo.
E o Tomcat esta retornando um erro, creio que seja algum problema de ser um Objeto da mesma classe, porque fiz um teste colocando um objeto de outra classe e o erro não acontece.
O erro:
root cause
org.hibernate.InstantiationException: could not instantiate test objectbr.com.fusionnet.modelo.Grupo
org.hibernate.engine.UnsavedValueFactory.instantiate(UnsavedValueFactory.java:48)
org.hibernate.engine.UnsavedValueFactory.getUnsavedIdentifierValue(UnsavedValueFactory.java:67)
org.hibernate.tuple.PropertyFactory.buildIdentifierProperty(PropertyFactory.java:67)
org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:136)
org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:475)
org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:133)
org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:84)
org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:295)
org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1385)
org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:954)
org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:883)
org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:56)
javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:48)
javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:32)
br.com.fusionnet.dao.JPAUtil.<clinit>(JPAUtil.java:8)
br.com.fusionnet.dao.DAO.listaTodos(DAO.java:52)
br.com.fusionnet.mb.UfBean.getUfs(UfBean.java:28)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
javax.el.BeanELResolver.getValue(BeanELResolver.java:62)
javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54)
com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:71)
org.apache.el.parser.AstValue.getValue(AstValue.java:123)
org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:106)
javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:190)
javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:178)
javax.faces.component.UISelectItems.getValue(UISelectItems.java:125)
com.sun.faces.renderkit.SelectItemsIterator.initializeItems(SelectItemsIterator.java:198)
com.sun.faces.renderkit.SelectItemsIterator.hasNext(SelectItemsIterator.java:131)
com.sun.faces.renderkit.html_basic.MenuRenderer.renderOptions(MenuRenderer.java:758)
com.sun.faces.renderkit.html_basic.MenuRenderer.renderSelect(MenuRenderer.java:840)
com.sun.faces.renderkit.html_basic.MenuRenderer.encodeEnd(MenuRenderer.java:294)
javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:879)
com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:308)
com.sun.faces.renderkit.html_basic.GridRenderer.renderRow(GridRenderer.java:181)
com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:125)
javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:849)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:1643)
javax.faces.render.Renderer.encodeChildren(Renderer.java:164)
javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:849)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:1643)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:1646)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:1646)
com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:389)
com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:127)
com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:117)
com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97)
com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:135)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:309)
root cause
java.lang.reflect.InvocationTargetException
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
java.lang.reflect.Constructor.newInstance(Constructor.java:513)
org.hibernate.engine.UnsavedValueFactory.instantiate(UnsavedValueFactory.java:45)
org.hibernate.engine.UnsavedValueFactory.getUnsavedIdentifierValue(UnsavedValueFactory.java:67)
org.hibernate.tuple.PropertyFactory.buildIdentifierProperty(PropertyFactory.java:67)
org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:136)
org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:475)
org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:133)
org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:84)
org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:295)
org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1385)
org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:954)
org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:883)
org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:56)
javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:48)
javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:32)
br.com.fusionnet.dao.JPAUtil.<clinit>(JPAUtil.java:8)
br.com.fusionnet.dao.DAO.listaTodos(DAO.java:52)
br.com.fusionnet.mb.UfBean.getUfs(UfBean.java:28)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
javax.el.BeanELResolver.getValue(BeanELResolver.java:62)
javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54)
com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:71)
org.apache.el.parser.AstValue.getValue(AstValue.java:123)
org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:106)
javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:190)
javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:178)
javax.faces.component.UISelectItems.getValue(UISelectItems.java:125)
com.sun.faces.renderkit.SelectItemsIterator.initializeItems(SelectItemsIterator.java:198)
com.sun.faces.renderkit.SelectItemsIterator.hasNext(SelectItemsIterator.java:131)
com.sun.faces.renderkit.html_basic.MenuRenderer.renderOptions(MenuRenderer.java:758)
com.sun.faces.renderkit.html_basic.MenuRenderer.renderSelect(MenuRenderer.java:840)
com.sun.faces.renderkit.html_basic.MenuRenderer.encodeEnd(MenuRenderer.java:294)
javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:879)
com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:308)
com.sun.faces.renderkit.html_basic.GridRenderer.renderRow(GridRenderer.java:181)
com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:125)
javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:849)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:1643)
javax.faces.render.Renderer.encodeChildren(Renderer.java:164)
javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:849)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:1643)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:1646)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:1646)
com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:389)
com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:127)
com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:117)
com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97)
com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:135)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:309)