Erro no hibernate

Programação Java
,
#1

Boas, estou recebendo o seguinte erro do hibernate:

    org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: me.mauro.albamoura.model.Cliente
java.lang.IllegalStateException
	at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1760)
	at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1677)
	at org.hibernate.jpa.internal.QueryImpl.getSingleResult(QueryImpl.java:524)
	at me.mauro.albamoura.dao.ClienteDao.contemCliente(ClienteDao.java:55)
	at me.mauro.albamoura.testes.AdicionarClienteTeste.adicionarEVerificarSeContem(AdicionarClienteTeste.java:51)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:45)
	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:123)
	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:104)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:164)
	at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:110)
	at org.apache.maven.surefire.booter.SurefireStarter.invokeProvider(SurefireStarter.java:175)
	at org.apache.maven.surefire.booter.SurefireStarter.runSuitesInProcessWhenForked(SurefireStarter.java:107)
	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:68)
Caused by: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: me.mauro.albamoura.model.Cliente
	at org.hibernate.engine.internal.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:294)
	at org.hibernate.type.EntityType.getIdentifier(EntityType.java:537)
	at org.hibernate.type.ManyToOneType.nullSafeSet(ManyToOneType.java:174)
	at org.hibernate.param.NamedParameterSpecification.bind(NamedParameterSpecification.java:67)
	at org.hibernate.loader.hql.QueryLoader.bindParameterValues(QueryLoader.java:613)
	at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1900)
	at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1861)
	at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1838)
	at org.hibernate.loader.Loader.doQuery(Loader.java:909)
	at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:354)
	at org.hibernate.loader.Loader.doList(Loader.java:2553)
	at org.hibernate.loader.Loader.doList(Loader.java:2539)
	at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2369)
	at org.hibernate.loader.Loader.list(Loader.java:2364)
	at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:496)
	at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:387)
	at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:231)
	at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1264)
	at org.hibernate.internal.QueryImpl.list(QueryImpl.java:103)
	at org.hibernate.jpa.internal.QueryImpl.list(QueryImpl.java:573)
	at org.hibernate.jpa.internal.QueryImpl.getSingleResult(QueryImpl.java:495)
	... 33 more

Neste metodo:

public boolean contemCliente(Cliente cliente) {
    comecarTrasanction();
    String jpql = "select c from Cliente c where c = :pCliente";
    Query query = this.em.createQuery(jpql);
    query.setParameter("pCliente", cliente);
    boolean retorno = query.getSingleResult() != null;
    commitarTrasaction();
    return retorno;
}

Esse método é suposto verificar se o cliente já existe no banco de dados. Já pesquisei bastante mas nao consigo resolver esse erro

#2

Tente usar o método find passando o ID do cliente.

Cliente c = em.find(Cliente.class, id);

return c != null;
1 curtida
#3

Se você estiver buscando pelo id, você pode fazer que nem o @RoinujNosde sugeriu, senão, tente assim:

String jpql = "select c from Cliente c where c.email = :emailCliente";
Query query = this.em.createQuery(jpql);
query.setParameter("emailCliente", cliente.getEmail());

PS: Só trocar o e-mail pelo atributo que quiser.
Atente-se a não ter mais de um registro com o mesmo valor de coluna/atributo (no caso o email), pois se tiver o método getSingleResult vai dar erro

1 curtida