49 | javax.persistence.PersistenceException: No Persistence provider for EntityManager named in Karaf 4.0.7 and OSGi DS test to persist an entity into an ObjectDB database. I'm working in C/S model and I have both the ObjectDB server and Karaf running on localhost. When I try to persist the entity I'm getting the javax.persistence.PersistenceException: No Persistence provider for EntityManager named objectdb://localhost:6136 |
12 | Persistence.PERSISTENCE_PROVIDERStatic Field javax.persistence.Persistence String PERSISTENCE_PROVIDER Deprecated. This final String is deprecated and should be removed and is only here for TCK backward compatibility Since: JPA 1.0 |
12 | CRUD Database Operations with JPA i = 0; i < 1000; i++) { Point p = new Point(i, i); em.persist(p); } em ... a managed entity) by the persist method. The new Point objects are physically stored in the database ... persisting objects in the database in more detail. JPA Queries with JPQL We can get the number of Point |
11 | Database Schema EvolutionModifications to entity classes that do not change their persistent field definitions (their schema ... and non persistent fields. However, additions, deletions and modifications to the persistent fields ... to any numeric type. In this context numeric types are: byte, short, char, int, long, float, double |
10 | javax.persistence.spi.PersistenceUnitInfojavax.persistence.spi Interface PersistenceUnitInfo Interface implemented by the container and used by the persistence provider when creating an javax.persistence.EntityManagerFactory. Since: JPA 1.0 ... are only transformed once within the same classloading scope, regardless of how many persistence units |
10 | DELETE Queries in JPA/JPQL. For example, the EntityManager may not be aware that a cached entity object in its persistence context has been removed from the database by a DELETE query. Therefore, it is a good practice to use |
10 | UPDATE SET Queries in JPA/JPQL its persistence context has been modified by an UPDATE query. Therefore, it is a good practice to use |
9 | javax.persistence.spi.PersistenceProviderjavax.persistence.spi Interface PersistenceProvider Interface implemented by the persistence provider. It is invoked by the container in Java EE environments and by the javax.persistence.Persistence class in Java SE environments to create an javax.persistence.EntityManagerFactory. Since: JPA 1.0 |
2 | Step 2: Define a JPA Entity Class code: package guest; import java.io.Serializable; import java.sql.Date; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; @Entity public ... ; // Persistent Fields: @Id @GeneratedValue Long id; private String name; private |
2 | Step 2: Define a JPA Entity Class.Serializable; import java.sql.Date; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; @Entity public class Guest implements Serializable { private static final long serialVersionUID = 1L; // Persistent Fields: @Id |
