5 | ObjectDB is opening too many sockets pool size when you initialize the EntityManagerFactory: Map<String, String> properties = new HashMap<>(); properties.put("javax.jdo.option.MaxPool", "10"); EntityManagerFactory emf |
5 | em.flush(); em.clear(); loosing data and not persisting managed objects.persistence.EntityManagerFactory; import javax.persistence.Persistence; public class Test { private final EntityManagerFactory emf; private final EntityManager em; public Test |
5 | Date field Index is corrupted due to time change.Entity; import javax.persistence.EntityManager; import javax.persistence.EntityManagerFactory ... "); EntityManagerFactory emf = Persistence.createEntityManagerFactory |
5 | Online backup problem in my servlet : EntityManagerFactory emf = null; EntityManager em = null; String result = "OK ... . EntityManagerFactory emf = Persistence.createEntityManagerFactory("HomplexServicesUnit"); EntityManager em = emf |
5 | Performance problem objects) First version of code: EntityManagerFactory emf = Persistence ... (); System.out.println((endTime - startTime)); Second version of code: EntityManagerFactory emf |
5 | @OneToMany(fetch = FetchType.LAZY) list is always null when using EAGER loading, but when I use LAZY with PersistenceUnit (not EntityManagerFactory), it fails ... LAZY with PersistenceUnit (not EntityManagerFactory), it fails. The no-detach option is currently not |
4 | Database size is much larger than expected (x2) static void main(String[] args) { EntityManagerFactory emf = Persistence |
4 | A distinguished Name for server or explorer is good for maintaining!In windows, the server runs as "javaw"; in Linux it is "java". If the server failed, for example, it always outputs this message, regardless changing IP setting: private final static EntityManagerFactory emf = Persistence .createEntityManagerFactory("objectdb://192.168.0.1/trie.odb;user=admin |
1 | Schema-Update: Rename superclass and remove one subclass Database public static void main(String[] args) { EntityManagerFactory emf = Persistence ... (String[] args) { // no drop - reuse the existing file EntityManagerFactory emf = Persistence |
0 | Eager Fetch of Map with Entities as Keys(String[] args) { EntityManagerFactory emf = Persistence |
