Bom dia a todos
Estou com o seguinte problema: criei um método genérico para inserção e atualização dos dados usando JPA. Até a parte de inserir novos dados no BD vai tudo bem, porém quando vou tentar atualizar algum dado, aí a coisa fica feia, tipo :shock: . O código que eu criei é o seguinte:
public boolean salvar(E e) {
logger.debug("Iniciando a tarefa de gravação do objeto " + e.getClass().getSimpleName());
EntityTransaction trans = getEm().getTransaction();
trans.begin();
logger.debug("Verificando se os dados ja existem...");
if(getEm().contains(e)){
logger.debug("Atualizando a tabela");
getEm().merge(e);
}else{
logger.debug("Inserindo novos dados na tabela");
getEm().persist(e);
}
trans.commit();
return true;
}
e o erro é:
Exception occurred during event dispatching:
javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist: dao.TipoAtributo
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1377)
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1300)
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1306)
at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:871)
at dao.ClasseModelDAO.salvar(ClasseModelDAO.java:128)
at control.CrtTipoAtributo.salvar(CrtTipoAtributo.java:149)
at control.CrtTipoAtributo.actionPerformed(CrtTipoAtributo.java:34)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.Dialog$1.run(Unknown Source)
at java.awt.Dialog$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Dialog.show(Unknown Source)
at java.awt.Component.show(Unknown Source)
at java.awt.Component.setVisible(Unknown Source)
at java.awt.Window.setVisible(Unknown Source)
at java.awt.Dialog.setVisible(Unknown Source)
at forms.FrmTipoAtributo.<init>(FrmTipoAtributo.java:56)
at control.CrtProjeto.evenPopMenu(CrtProjeto.java:93)
at control.CrtProjeto.actionPerformed(CrtProjeto.java:47)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.AbstractButton.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.menuDragMouseReleased(Unknown Source)
at javax.swing.JMenuItem.fireMenuDragMouseReleased(Unknown Source)
at javax.swing.JMenuItem.processMenuDragMouseEvent(Unknown Source)
at javax.swing.JMenuItem.processMouseEvent(Unknown Source)
at javax.swing.MenuSelectionManager.processMouseEvent(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: org.hibernate.PersistentObjectException: detached entity passed to persist: dao.TipoAtributo
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:141)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:78)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:844)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:819)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:823)
at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:865)
... 69 more
Para criar este método eu adaptei do seguinte código:
public void save(Cliente cliente){
EntityTransaction trans = em.getTransaction();
trans.begin();
//Se o cliente ja existe
if(em.contains(cliente)){
//Atualiza o cliente
em.merge(cliente);
}else{
//Senao cria um novo
em.persist(cliente);
}
trans.commit();
}
.
Pelo que verifiquei o problema pode ser por causa cache, pois não encontra no EntityManager (“em”). Outra possível causa é o fato do objeto estar no estado “datached” (não entendi o que significa, parece que o objeto está fora de sincronia com o banco), ou ainda, achei na net, o problema poderia ser porque a classe está marcada para gerar códigos automaticamente (o atributo chave possui tanto a anotação “@Id”, quanto “@GeneratedValue”). Acho está último hipótese meio estranha, mas como não entendo muita coisa de hibernate e de JPA entendo menos ainda, estou considerando.
Agradeço a todos que puderem ajudar.
Inté…