jpa

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Java persistence entity manager factory returning null

I am using MySql database with JPA. my persistence.xml looks like <?xml version=\"1.0\" encoding=\"UTF-8\"?>[详细]

2023-04-10 19:50 分类：问答
JPA ManyToMany relation update failed due to constraint key in another relation

While developing an Eclipse GEF application using an eclipselink implementation of JPA i have found an error that has been annoying me for a while:[详细]

2023-04-10 18:05 分类：问答
JPQL/HQL - Is it possible to specify the order, by providing a list of IDs?

(Note: I\'m using the Play! framework, which uses Hibernate as the J开发者_如何学编程PA implementation.)[详细]

2023-04-10 16:51 分类：问答
Is it possible to impl database 'trigger' in java code? (hibernate + jpa + spring + mysql)

I am using mysql 5.5 DB, hibernate.4.0 as jpa provider to spring 3.0.5. I have a user table and privilege table in my DB. Also I have some triggers in my DB. Those trigger implements some of our appl[详细]

2023-04-10 16:42 分类：问答
The annotation PersistenceContext will not be recognized by WebSphere Application Server v7.0 runtimes

I am getting the error message in Websphere when trying to use JPA @PersistenceContext annotation. I am using JPA 2.0 and hibernate as persistence provider, have all the required hibernate 3.5 jar f[详细]

2023-04-10 16:13 分类：问答
how to save simple CRUD codes in a service, just like GenericDao/JpaRepository?

Our web project uses spring3, Jpa (hibernate). To save CRUD and other commonly used methods, we made our repositories sub-classes of spring JpaRepository.[详细]

2023-04-10 14:49 分类：问答
How does the UserTransaction and the EntityManager interact?

This is an academic question; I have no broken code in relation to this.I just want to expand my understanding of what is happening under the hood.[详细]

2023-04-10 11:30 分类：问答
Bidirectional relationship with superclass entity property in JPA

I\'m tying to implement some tree-like structure with JPA. I have a \"folder\" entity and a \"test\" entity. Folder can contain both folders and tests. Test doesnt contains anything.[详细]

2023-04-10 10:49 分类：问答
Jpa - Hibernate @Version incorrectly incremented

I\'m using jpa with hibernate (3.2.7) as orm implementation. I have an entity being modified and then merged.[详细]

2023-04-10 05:59 分类：问答
is there any benefits for using ORDBMS instead RDBMS behind JPA

Today I reviewed postgreSQL wiki and I found it is a ORDBMS (object-relational database management system), so I want to know is there any benefits for using postgreSql (RDBMS) behind the JPA (hiberna[详细]

2023-04-10 05:38 分类：问答