playframework « Development « JPA Q&A

1. Informix XA Driver in Play! Framework application    stackoverflow.com

I am trying to use Informix database with a Play! Framework application. I am new to Informix. I have Informix 11.70 installed on my windows machine and I am running Play ...

2. JPA and Threads in play framework    stackoverflow.com

I'm trying to create a multithreading server. The problem is that I get the following error: play.exceptions.JPAException: The JPA context is not initialized. JPA Entity Manager automatically start when one or more ...

3. Basic JPA issue: "Could not determine type for: java.util.Set"    stackoverflow.com

I'm just getting started building my JPA schema in a Play Framework web app. I have a reasonable understanding of SQL, but I'm a JPA newbie, and I'm being tripped ...

4. Menu Tree with Hibernate in Play!    stackoverflow.com

My first project with Hibernate/JPA and Play!, I've got a menu that once working, will support changes (i.e. easily add nodes to the tree). Struggling (in the >5 hours sense) just ...

5. Tree with JPA[/Hibernate]    stackoverflow.com

Grrrrrr, trying to implement a very simple tree. It doesn't need to be bidirectional (since traversals are only top-down), so I assume it would be better (i.e. more space efficient) if ...

6. combine entityManeger methods with standard play methods    stackoverflow.com

I need extend delete() action from playframework Model class and I have to use EntityManager and nativeQuery. I have not figured out yet what playframework does exactly with a session (i ...

7. PersistenceException from a simple CRUD for a simple class    stackoverflow.com

Using the in-memory database (db=mem), I'm simply trying to insert a new object into the database using CRUD. The class is as follows:

@Entity
public class ActivityModel extends Model {
    @Required
 ...

8. Do you need JPA when using MongoDB?    stackoverflow.com

I'm quite confused between those two. I'm looking at the Play! java framework and it says it uses JPA. I'm thinking about using Play! and MongoDB for the first time in ...

9. Can Play be used without JPA, swapping in your own CRUD implementation?    stackoverflow.com

I am evaluating play for usage as an admin system over a family of applications in an SOA environment. Each application has their own persistence, and the various CRUD operations can be ...

10. JPAException occur when trying to access to any page after Secure login    stackoverflow.com

On my website using Play!, I have an Admin part. All Admin controllers have a @With and a @Check annotation. When disconnected, everything goes fine. When connected, each time I load a page ...

11. OrderedColumn in combination playframework gives me for all entries 0 as index    stackoverflow.com

I have the following model (playframework):

@Entity
public class Album extends Model{

    public Album(){
        this.creationDate = new Date();
    }

  ...

12. Why is my ConstraintViolationException not being caught?    stackoverflow.com

I'm using Play Framework, and have the following code:

import org.hibernate.exception.ConstraintViolationException;

...
public class AuthorService extends Controller

    ...

    public static void delete(Long id)  
    ...

13. Play! not shutting down H2 correctly    stackoverflow.com

I'm using Play to write a webapp which is deployed in Tomcat. Because the app won't be processing very much data I'm using the default H2 database with Hibernate. ...

14. Private members in Model    stackoverflow.com

I'm working with play. I defined a private member in my model, hoping that JPA wouldn't try to handle it. For some reason I get this error : A JPA error occurred (Unable to build ...

15. How to get the most occured set of objects?    stackoverflow.com

I have two objects.

@Entity
class Person extends Model {

    ...
    @OneToOne
    Category category;
}


@Entity 
class Category extends Model {
    ...
}

16. QueryDSL and Play Framework    stackoverflow.com

I'm using QueryDSL with JPA2 for some time, and it's the most powerful combination for ORM I know. JPA Criteria API is a disaster. With QueryDSL I've forgotten about JPQL too. I'd ...

17. Display EmbeddedId in view (Hibernate/PlayFramework)    stackoverflow.com

I have a class model which is inherits GenericModel. In this class there is an EmbeddedId. My model class :

@Entity
@Table(name = "serviceItem")
public class ServiceItem extends GenericModel {

@EmbeddedId
public ServiceItemPK serviceItemId;

@Required
@Min(1)
public int pointPosition;

18. Is there a way to use MyBatis with the Play! framework?    stackoverflow.com

First of all, Kudos \m/ on selecting the best Java web framework... Since we have good Oracle PL/SQL developers, we want to ditch the default JPA plugin and use MyBatis instead. I ...

19. JPA.getJPAConfig method not found on Play's API    stackoverflow.com

I'm using the most recent version of Play (v.1.2.3) and my system need to read data from one database and persist it to another one. I found on Play documentation there's a ...

20. How do I create an object with nested objects using Hibernate?    stackoverflow.com

I'm getting the following exception:

Referential integrity constraint violation: "FK779B6FDFD4D56C1: PUBLIC.LOG_TAG FOREIGN KEY(PEOPLE_ID) REFERENCES PUBLIC.TAG(ID)";

Set<String> tagList = getTags();
Log log = new Log(content, user);
log.addTags(tagList);
log.save();