Hibernate - Consulta sobre

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java.lang.IllegalArgumentException: object is not an instance of declaring class
sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknow n Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Un known Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.hibernate.property.BasicPropertyAccessor$Basic Getter.get(BasicPropertyAccessor.java:164)
org.hibernate.tuple.entity.AbstractEntityTuplizer. getIdentifier(AbstractEntityTuplizer.java:341)
org.hibernate.persister.entity.AbstractEntityPersi ster.getIdentifier(AbstractEntityPersister.java:43 23)
org.hibernate.persister.entity.AbstractEntityPersi ster.isTransient(AbstractEntityPersister.java:4045 )
org.hibernate.engine.internal.ForeignKeys.isTransi ent(ForeignKeys.java:209)
org.hibernate.engine.internal.ForeignKeys.getEntit yIdentifierIfNotUnsaved(ForeignKeys.java:248)
org.hibernate.type.EntityType.getIdentifier(Entity Type.java:459)
org.hibernate.type.ManyToOneType.nullSafeSet(ManyT oOneType.java:132)
org.hibernate.persister.entity.AbstractEntityPersi ster.dehydrate(AbstractEntityPersister.java:2603)
org.hibernate.persister.entity.AbstractEntityPersi ster.update(AbstractEntityPersister.java:2984)
org.hibernate.persister.entity.AbstractEntityPersi ster.updateOrInsert(AbstractEntityPersister.java:2 919)
org.hibernate.persister.entity.AbstractEntityPersi ster.update(AbstractEntityPersister.java:3248)
org.hibernate.action.internal.EntityUpdateAction.e xecute(EntityUpdateAction.java:140)
org.hibernate.engine.spi.ActionQueue.execute(Actio nQueue.java:362)
org.hibernate.engine.spi.ActionQueue.executeAction s(ActionQueue.java:354)
org.hibernate.engine.spi.ActionQueue.executeAction s(ActionQueue.java:276)
org.hibernate.event.internal.AbstractFlushingEvent Listener.performExecutions(AbstractFlushingEventLi stener.java:326)
org.hibernate.event.internal.DefaultFlushEventList ener.onFlush(DefaultFlushEventListener.java:52)
org.hibernate.internal.SessionImpl.flush(SessionIm pl.java:1214)
org.hibernate.internal.SessionImpl.managedFlush(Se ssionImpl.java:403)
org.hibernate.engine.transaction.internal.jdbc.Jdb cTransaction.beforeTransactionCommit(JdbcTransacti on.java:101)
org.hibernate.engine.transaction.spi.AbstractTrans actionImpl.commit(AbstractTransactionImpl.java:175 )
org.springframework.orm.hibernate4.HibernateTransa ctionManager.doCommit(HibernateTransactionManager. java:480)
org.springframework.transaction.support.AbstractPl atformTransactionManager.processCommit(AbstractPla tformTransactionManager.java:754)
org.springframework.transaction.support.AbstractPl atformTransactionManager.commit(AbstractPlatformTr ansactionManager.java:723)
org.springframework.transaction.interceptor.Transa ctionAspectSupport.commitTransactionAfterReturning (TransactionAspectSupport.java:394)
org.springframework.transaction.interceptor.Transa ctionInterceptor.invoke(TransactionInterceptor.jav a:120)
org.springframework.aop.framework.ReflectiveMethod Invocation.proceed(ReflectiveMethodInvocation.java :172)
org.springframework.aop.framework.Cglib2AopProxy$D ynamicAdvisedInterceptor.intercept(Cglib2AopProxy. java:622)
local.dao.PedidoDao$$EnhancerByCGLIB$$a9771d59_2.s ave(<generated>)
local.controller.PedidoController.finishP(PedidoCo ntroller.java:252)
sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknow n Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Un known Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.springframework.web.method.support.InvocableHa ndlerMethod.invoke(InvocableHandlerMethod.java:213 )
org.springframework.web.method.support.InvocableHa ndlerMethod.invokeForRequest(InvocableHandlerMetho d.java:126)
org.springframework.web.servlet.mvc.method.annotat ion.ServletInvocableHandlerMethod.invokeAndHandle( ServletInvocableHandlerMethod.java:96)
org.springframework.web.servlet.mvc.method.annotat ion.RequestMappingHandlerAdapter.invokeHandlerMeth od(RequestMappingHandlerAdapter.java:617)
org.springframework.web.servlet.mvc.method.annotat ion.RequestMappingHandlerAdapter.handleInternal(Re questMappingHandlerAdapter.java:578)
org.springframework.web.servlet.mvc.method.Abstrac tHandlerMethodAdapter.handle(AbstractHandlerMethod Adapter.java:80)
org.springframework.web.servlet.DispatcherServlet. doDispatch(DispatcherServlet.java:923)
org.springframework.web.servlet.DispatcherServlet. doService(DispatcherServlet.java:852)
org.springframework.web.servlet.FrameworkServlet.p rocessRequest(FrameworkServlet.java:882)
org.springframework.web.servlet.FrameworkServlet.d oGet(FrameworkServlet.java:778)
javax.servlet.http.HttpServlet.service(HttpServlet .java:617)
javax.servlet.http.HttpServlet.service(HttpServlet .java:723)