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Questions tagged [entitymanager]

The EntityManager is the representation of a PersistenceContext, allowing a user to manipulate data pulled from a database.

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Test case for entity manager

Getting a null pointer exception on Mockito.when for the below code line. when(entityManager.createQuery(any(String.class)).setParameter(any(String.class), any(String.class)).getSingleResult()).thenReturn("2"); Trying to mock entity manager which…
Jill
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Integrate BooleanExpression into SQL query

this is my situation : BooleanExpression be = //a certain BooleanExpression; @Autowired private EntityManager em; List result = (List) em.createQuery("select x from y where" + be); What i would like to do is to take my…
user6404301
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Cannot update to Null error when calling entityManager.remove?

I am attempting to remove an entity and delete its row from the database using the following method: public void remove(Object o){ this.persistence.entityManager().remove(o); } When I attempt to do so I am getting the error: ERROR…
java123999
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Can't create an instance of TypedQuery for executing a criteria query

I'm beginner in JPA. I just want to return all instances of the entity method getAll. But when I collect my project in WAR I get this Error error. I don't know what is the problrem. Maybe problem in my entity or context. Typical…
Stanislav Screbets
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EclipseLink not populating Lazy OneToOne with nested Lazy OneToMany Relation

I migrated from Hibernate to EclipseLink because we needed composite primary keys which EclipseLink handles well and Hibernate doesn`t (really does not!). Now I am fixing our JUnit tests, I get issues with tons of OneToMany relations not loaded. I…
Ben
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java.util.Collections.swap(List list, int i, int j) do nothing

I have a Java Spring MVC and one of my models is Category @Entity @Getter @Setter @NoArgsConstructor @AllArgsConstructor @ToString public class Category extends AuditModel { @JsonView(DataTablesOutput.View.class) String name; boolean…
vdruta
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JPA code not executing further after transaction.commit

Main method EntityManagerFactory emf=Persistence.createEntityManagerFactory("manager1"); EntityManager em1=emf.createEntityManager(); EntityTransaction entityTransaction=em1.getTransaction(); entityTransaction.begin(); Person…
Piyush Sonavale
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removing entity with unidirectional relationship @ManyToOne (JPA)

I have problem, becouse I don't know how to remove specific role from User. This problem is connected with unidirectional relation in Permission class. These are only relevant code snippets. Class Person @Entity public class User…
user6620805
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Merge operation without exception but with no impact on the database Glassfish 4.1 JPA

I got a table with a string field and try to update this field and the merge the update to the database via EntityManager. This is done and without exceptio but I see no effect on the database and ran out of ideas what's up there. Hope somebody has…
TomFree
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Unexpected Row Count: Actual 0 expected 1?

I have a Java application and have created a Repository class to query my Oracle Database. The persistence query below that I am using is causing an error. Query: Query query = persistence.entityManager().createNativeQuery("Select * from PERSON…
java123999
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Commit EntityManager Transaction using @Transactional - Guice

I'm using Guice to Inject EntityManager. When I commit the trasaction of the injected entityManager there is nothing happend in the BD side : no transaction passed !!! can you help me to figure out what is going on ? Here is my code : Web.xml …
Mohamed Taboubi
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Should I avoid creating EntityManagerFactory too many times

I am using JPA to persist records to Oracle database. Everytime I run the application, it goes to a particular directory and parse every single file in there and load into tables. Usually there are thousands of files to be processed. An new…
ddd
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PersistenceContext in multithreading

For some reason the EntityManager isn't being injected into a separate thread that I want to keep running in the background. Other classes can access the entity manager without a problem, but those aren't running in a separate thread. What am I…
Strike08
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Doctrine : get object informations before flush

I have an object "Survey" link to some "Questions" entities (One To Many association). In my controller, I can add some Questions to this Survey. At the end, I would like to do some stuff before any flush. For example, first I have : Survey1 with…
eluus
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EntityManager.find() does not find entity

I'm having a problem with JPA and Hibernate where EntityManager.find() or even EntityManager.createQuery() will not return an entity in my database with the corresponding ID. The former returns null and the latter throws a No entity found for query…
Graham
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