public void afterPropertiesSet() throws Exception {
super.afterPropertiesSet();
if (queryProvider == null) {
Assert.notNull(entityManagerFactory);
Assert.hasLength(queryString);
}
// making sure that the appropriate (JPA) query provider is set
else {
Assert.isTrue(queryProvider != null, "JPA query provider must be set");
}
}
@Override
protected void doOpen() throws Exception {
super.doOpen();
entityManager = entityManagerFactory.createEntityManager(jpaPropertyMap);
if (entityManager == null) {
throw new DataAccessResourceFailureException("Unable to obtain an EntityManager");
}
// set entityManager to queryProvider, so it participates
// in JpaPagingItemReader's managed transaction
if (queryProvider != null) {
queryProvider.setEntityManager(entityManager);
}
}
@Override
protected void doClose() throws Exception {
entityManager.close();
super.doClose();
}