The EntityManager is the representation of a PersistenceContext, allowing a user to manipulate data pulled from a database.
Questions tagged [entitymanager]
1802 questions
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java persistence cross object method access
I am using an Employee and Company class as an example. In a Java persistence environment (Hibernate), when a bean is processing an Employee class with its' own Entity Manager, how can I call a Company class bean method when that object has its' own…
daggetlover
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Java EE, Integer to User?
I have recently asked quite similar question here, but answer does not solve my new problem.
I have two tables: User and Book, they are in ManyToOne relation. The Book table has attribute called user_id that connects both tables. Using Eclipse I…
Macjej
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EntityManager merge function setting non-set values of the obect to null
em.merge() updating uninitialized properties of the entity to null..
@PersistenceContext
public EntityManager em;
em.merge(invoice);
in my database it is updating all the values which were set in invoice object,
as well as it is updating…
Jitendra Yadav
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How to subtract two fields in a one to many relation
I want to subtract a value from another field each time I add a new record this is my case:example
soldeJours(from entity contrat) = nbjours (from entity contrat) - dureeAssistance (from entity assistance):
Exemple :
nbjours = 20 and when I add a…
user3419507
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2 answers
Spring JPA Multiple Datasources
I've seen similar questions on here but haven't been able to find an answer that truely works for me.
I have 2 different datasources, each with its own transaction manager and entity manager factory. They are each defined in their own config…
jrichmond4
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Spring-batch Entity Manager becomes null after init
I'm currently implementing a Spring-batch that reads and writes to files BUT also needs to do CRUD operations on a database.
I've tried to simply define an Entity manager in my xml configuration, and use it in my DAO class. However, right after the…
pegas
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2 answers
Use two entity managers for one entity
The situation is the following: I have two databases Db1 and Db2, for which I have two EntityManagers em1 and em2 defined. Furthermore, I have the entity Person(int id, String name, Pet pet) mapped to the table persons(id, name) in the database Db1…
Rolch2015
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persisting a bean failed and throw ValidationException [spring MVC]
I am trying to add a new count to the database and I should be sur that the username is unique, so I create a custom validator, but it throw an Exception :
org.hibernate.AssertionFailure: null id in com.EChallenge.model.Compte entry (don't flush the…
ADA15
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JPQL: why 'group by' does not work properly
Executing JPQL using hibernate 4.2.5:
select c from Chargeback as cc join cc.customer as c group by c order by max(cc.created)
Usecase: show customers with the latest chargbacks.
produces org.hibernate.exception.SQLGrammarException: could not…
kadkaz
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How does a JBoss datasource failover handle failure in single transaction?
This is my connection detail in JBoss standalone.xml
…
Rahul Verma
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1 answer
entityMananger not working with Date parameter
Using EntityManager approach with Hibernate. Whenever using a date field query I am expecting it to look for date with complete date and time, but it only uses date not time.
where cou0_.expiry_date>'22-Jan-16'
spring config
Ankit Katiyar
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Getting java.lang.ExceptionInInitializerError
I am creating a small program for a school exercise. I have no clue where I could have done anything wrong. Could someone please help me with this?
I get this error when I run my test. I get the error at the this.emf = TestUtil.getEMF(); line.
/*
*…
Soundbite
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How to convert Map to Map
I used old JPA so that I can use code as below:
JpaProperties jpaProerties;
EntityManagerFactoryBuilder(jpaVendorAdapter, jpaProperties, persistenceUnitManager)
Now it is deprecated so I want to change it to
JpaProperties…
mikezang
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IllegalAccessError in Java SE app with Weld implementation
I am trying to run a standalone app that has Weld implementation of CDI, and in that app I need EntityManager to work with Oracle database.
When I run my app (via Weld main method), following is shown in cmd line:
Exception in thread "main"…
Sarpy
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