リポジトリを作成およびカスタマイズするためのリファレンスガイドに従って、次のことを思いつきました。
public class MyBasicRepositoryFactoryBean<R extends JpaRepository<T, I>, T extends BaseEntity, I extends Serializable>
extends JpaRepositoryFactoryBean<R, T, I> {
@Override
protected RepositoryFactorySupport createRepositoryFactory(
EntityManager entityManager) {
return new MyBasicRepositoryFactory<T, I>(entityManager);
}
private static class <T extends AlisEntity, I extends Serializable>
extends JpaRepositoryFactory {
private EntityManager entityManager;
public AlisDaoFactory(EntityManager entityManager) {
super(entityManager);
this.entityManager = entityManager;
}
@Override
protected Object getTargetRepository(RepositoryMetadata metadata) {
return new AlisDaoImpl<T, I>((Class<T>) metadata.getDomainType(),
entityManager);
}
@Override
protected Class<?> getRepositoryBaseClass(RepositoryMetadata metadata) {
// The RepositoryMetadata can be safely ignored, it is used by the
// JpaRepositoryFactory
// to check for QueryDslJpaRepository's which is out of scope.
return MyBasicRepository.class;
}
}
@NoRepositoryBean
public interface MyBasicRepository<T extends MyEntity, KEY extends Serializable> extends CrudRepository<T, KEY> {
void customBaseFoo(T entity);
}
public interface ChildCustomRepository{
void customChildFoo();
}
public interface ChildRepository extends MyBasicRepository<Child, Integer>, ChildCustomRepository {
void findByName(String name);
}
の実装については、またはおそらくcustomChildFoo()
を呼び出したいと思います。ChildRepository.findByName
MyBasicRepository.customBaseFoo()
もちろん、これらはChildRepositoryImpl
implementsChildCustomRepository
であり notChildRepository
であるため、アクセスできません。それ以外の場合は、基本的な CRUD とカスタム インターフェイスの実装も作成する必要があります。
ChildRepository
そして、私はそのようにImplに注入しようとしました:
public class ChildRepositoryImpl implements ChildCustomRepository{
@Resource
private ChildRepository base;
@Override
public void customChildFoo(){
Child child = base.findByName();
// do some logic with found child here
base.customBaseFoo(child);
}
しかし、次の理由で失敗します。
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'childDao': FactoryBean threw exception on object creation; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:149)
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:109)
at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1442)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:248)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:848)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:790)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:707)
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:438)
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.getResource(CommonAnnotationBeanPostProcessor.java:416)
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor$ResourceElement.getResourceToInject(CommonAnnotationBeanPostProcessor.java:549)
at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:150)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessPropertyValues(CommonAnnotationBeanPostProcessor.java:303)
... 65 more
Caused by: java.lang.NullPointerException
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.getObject(RepositoryFactoryBeanSupport.java:125)
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.getObject(RepositoryFactoryBeanSupport.java:41)
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:142)
... 78 more
では、どうすればそれを達成できるでしょうか。