I got the same problem with @ManyToOne column. It was solved… in stupid way. I had all other annotations for public getter methods, because they were overridden from parent class. But last field was annotated for private variable like in all other classes in my project. So I got the same MappingException without the reason. … Read more
What happens if I promote the column to be a/the PK, too (a.k.a. identifying relationship)? As the column is now the PK, I must tag it with @Id (…). This enhanced support of derived identifiers is actually part of the new stuff in JPA 2.0 (see the section 2.4.1 Primary Keys Corresponding to Derived Identities … Read more
Spring Data JPA 1.11 now supports the exists projection in repository query derivation. See documentation here. In your case the following will work: public interface MyEntityRepository extends CrudRepository<MyEntity, String> { boolean existsByFoo(String foo); }
First of all, let’s talk about process level cache (or 2nd level cache as they call it in Hibernate). To make it work, you should configure cache provider tell hibernate what entities to cache (right in hbm.xml file if you use this kind of mapping). You tell to the cache provider how many objects it … Read more
You can use pagination with a native query. It is documented here: Spring Data JPA – Reference Documentation “You can however use native queries for pagination by specifying the count query yourself: Example 59. Declare native count queries for pagination at the query method using @Query“ public interface UserRepository extends JpaRepository<User, Long> { @Query(value = … Read more
Hibernate requires next to zero configuration if you use annotations. It even can auto-discover mapped beans in the classpath! I don’t see any alternative to it from both simplicity and power point of view. It can also expose itself as JPA, which is (IMHO) even simpler.
I figure it out. Modify method entityManagerFactory for both Db2Configuration and OracleConfiguration to supply them with the information about hibernate dialect: for DB2 @Primary @Bean(name = “db2EntityManagerFactory”) public LocalContainerEntityManagerFactoryBean entityManagerFactory( EntityManagerFactoryBuilder builder , @Qualifier(“db2DataSource”) DataSource dataSource) { final HashMap<String, Object> hibernateProperties = new HashMap<String, Object>(); hibernateProperties.put(“hibernate.dialect”, “org.hibernate.dialect.DB2390Dialect”); return builder .dataSource(dataSource) .packages(“project.dataconfig.db2.entity”) .properties(hibernateProperties) .persistenceUnit(“db2persistanceunit”) .build(); } … Read more
I see the following options: 1) You can use @Generated annotation. You should have a table declared in the following way: create sequence TST_DATA_SEQ increment by 1 start with 1; create table TST_DATA ( … dat_auto integer default nextval(‘TST_DATA_SEQ’), … ); and appropriate column in the entity: @Generated(value = GenerationTime.INSERT) @Column(name = “dat_auto”, insertable = … Read more
A cursory search of Google for ‘hibernate custom id generator tutorial’ turned up the following possibilities. I’ve excluded those that don’t look useful and summarized the content of each. http://www.devx.com/Java/Article/30396 – covers the issues of generating an ID before the data is persisted (and hence does not yet have a business key). http://docs.jboss.org/hibernate/core/3.6/reference/en-US/html_single/#mapping-declaration – the … Read more
I ended up with AOP solution : @Aspect @Component public class EnableFilterAspect { @AfterReturning( pointcut=”bean(entityManagerFactory) && execution(* createEntityManager(..))”, returning=”retVal”) public void getSessionAfter(JoinPoint joinPoint, Object retVal) { if (retVal != null && EntityManager.class.isInstance(retVal)) { Session session = ((EntityManager) retVal).unwrap(Session.class); session.enableFilter(“myFilter”).setParameter(“myParameter”, “myValue”); } } }