The EntityManager is the representation of a PersistenceContext, allowing a user to manipulate data pulled from a database.
Questions tagged [entitymanager]
1802 questions
0
votes
2 answers
Need to use Symfony Console Command to accept input and access the data from database
As per the documentation on the symfony, i have created the console file in /bin folder
!/usr/bin/env php
date_default_timezone_set('UTC');
set_time_limit(0);
(@include_once DIR . '/../vendor/autoload.php') || @include_once
DIR .…
Jacckie Mer
- 1
- 3
0
votes
1 answer
How to check if there's no change in a database?
I have a short question about EntityManager.
I have a method updateAdmin(Admin a).
Behaviour:
This method should update an existing Admin in my database.
Return true if an admin exist an the update was successful.
Return false if the Admin that has…
Momo Saibak
- 37
- 1
- 9
0
votes
0 answers
Injection of EntityManager in JSF
I am using injections but I have some problems :
HTTP Status 500 - javax.ejb.EJBException: The bean encountered a non-application exception; nested exception is:
type Exception report
message javax.ejb.EJBException: The bean encountered a…
davyd
- 13
- 6
0
votes
0 answers
create multiple entityManager from entityManagerFactory
When i used one entityManager for one entityManagerFactory everything work now i'm trying multiple EntityManager for one entityManagerFactory
I have several scheme (Instance) of my database. With only 1 entityManagerFactory i'm trying to create…
tamtoum1987
- 1,957
- 3
- 27
- 56
0
votes
1 answer
Update database when some entries were removed JPA
I'm developing a logic in the server side of my project that will update an Entity in the database. But this entity has reference to a list of another entity.
So, for example I have an Entity Test like this one:
@Entity
public class Test {
…
Felipe Mosso
- 3,907
- 11
- 38
- 61
0
votes
1 answer
Hibernate Criteria ManyToMany selection
I have two classes Student and Class in @ManyToMany relationship. I would like to select all classes in which student (id = 1) is not. How can I do it?
Amsik
- 698
- 2
- 6
- 26
0
votes
0 answers
Unable to build entity manager
My persistence.xml
Mirza
- 33
- 5
0
votes
1 answer
Test EntityManager using JUnit Mockito
I am using Junit with Mockito. I want to test EntityManager, i am getting java.lang.NullPointerException
The below is what i have tried,
main class method is,
@Override
public ReplicationPerspective buildReplicationPerspective(final String…
Arasu
- 2,078
- 6
- 40
- 67
0
votes
1 answer
No transactional EntityManager available;
My app using spring and jpa, i have two config file:
AppConfig:
@Configuration
@EnableTransactionManagement
@ComponentScan(basePackages = { "com.test.api"…
namtn
- 71
- 1
- 6
0
votes
2 answers
Transactions and detach objects JPA
Good morning in my timezone.
Technologies : EJB 3.0
JPA provider ->(openjpa)
Container -> WAS
SNIPPET OF CODE:
@Stateless(name = "ejb/BeanName")
public class A implements AInterface{
@PersistenceContext(unitName =…
tt0686
- 1,771
- 6
- 31
- 60
0
votes
1 answer
Null Pointer Exception while trying to Update or Delete any item using openJPA
I am getting below Exception while I try to Update or Delete any item from database using openJPA:
Caused by: java.lang.NullPointerException
at org.apache.openjpa.kernel.StateManagerImpl.replaceObjectField(StateManagerImpl.java:2076)
at…
JavaJo
- 15
- 10
0
votes
1 answer
Cannot acquire data source whit PostgreSql. Can't use JPA EntityManager
I have the next problem:
I am doing a project using JPA and Restfull whit netbeasn and postgres, I have the following persistence
Andres Luque
- 45
- 4
0
votes
1 answer
EntityManager merge() in JPA
I'm working on an application that manages two tables in a database with JPA. The first one contains Users and the second one Items; one user can have many items but an item only corresponds to one user. This means that theres is a One to Many…
JsMartinez
- 321
- 1
- 5
- 16
0
votes
2 answers
JPA EntityManager Nullpointer exception (which shouldn't be!?)
My ejb code:
@Stateless
public class EmployeeBean {
@PersistenceContext(unitName="Eclipselink_JPA")
private EntityManager entitymanager;
public void createEmployee(){
Employee employee = new Employee( );
…
lecarpetron dookmarion
- 519
- 2
- 7
- 18
0
votes
2 answers
Retrieve specific table rows using Java Persistence
I have a table patient_details(patient_id, first_name, last_name, address,date_of_birth, gender, contact_number,occupation). I have generated an entity class and a PersistenceUnit. I can only find an object using its ID:
PatientDetails pd =…
1fuyouinfinite
- 1
- 1
- 1
- 14