PersistenceContextInjectStrategy.java 文件源码

@Override
public void inject(Object result, Field field) {
    try {

        String unitName = field.getAnnotation(PersistenceContext.class).unitName();
        if (StringUtils.isEmpty(unitName))
            unitName = PersistenceUnitProvider.DEFAULT_DS;

        if (!field.getType().equals(EntityManager.class)) {

            log.error("Failed to create PersistenceContext, type of field is not a EntityManager");
            return;
        }

        EntityManager em = provider.getProvider().createEntityManager();

        field.setAccessible(true);
        field.set(result, em);
    } catch (Exception e) {

        log.error("Failed to create PersistenceContext", e);
    }
}