EntityManager refresh problem

Question

I'm getting this error from my EntityManager when I call the refresh function.

public void saveProduct(Product product) {     entityManager.refresh(product); } 

I heard this could be a bug with Spring/Hibernate, however I'm not sure how to get around this.

Edit: the error is

java.lang.IllegalArgumentException: Entity not managed org.hibernate.ejb.AbstractEntityManagerImpl.refresh(AbstractEntityManagerImpl.java:268) 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) org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:358) $Proxy17.refresh(Unknown Source) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:597) org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:198) $Proxy11.refresh(Unknown Source) springapp.repository.JdbcProductDao.saveProduct(JdbcProductDao.java:66) springapp.service.SimpleProductManager.increasePrice(SimpleProductManager.java:28) springapp.web.PriceIncreaseFormController.onSubmit(PriceIncreaseFormController.java:39) 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) org.springframework.web.bind.annotation.support.HandlerMethodInvoker.doInvokeMethod(HandlerMethodInvoker.java:421) org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:136) org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:326) org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:313) org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:875) org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:807) org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571) org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:511) javax.servlet.http.HttpServlet.service(HttpServlet.java:637) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 

Answer 1

From the docs of EntityManager:

IllegalArgumentException - if not an entity or entity is not managed

1. Check if your entity is mapped (using @Entity, or with .xml configuration)
2. Your entity must be persistent - i.e. managed by the entityManager. So if your entity is detached, merge() it first, and then refresh() it.

Answer 2

public void saveProduct(Product product) {     ...      Product managedProductEntity = entityManager.find(Product.class, product.getId());     entityManager.refresh(managedProductEntity);      ... } 

Works this way. managedProductEntity will be managed, and therefore it can be refreshed from database.