Question

我开发了一个带有spring mvc 4.的web应用程序，用于DAO层，我添加了一个类GenericDAO：`public class GenericDAO {

@PersistenceContext
private EntityManager entityManager;

private Class<T> parametrizedType;

public GenericDAO(Class<T> parametrizedType) {
    this.parametrizedType = parametrizedType;
}

public EntityManager getEntityManager() {
    return entityManager;
}

public List<T> executeQuery(String query){
    TypedQuery<T> typedQuery = entityManager.createQuery(query, parametrizedType);
    List<T> result = typedQuery.getResultList();
    return result;
}

public List<T> listAll(){
    List<T> result = getEntityManager().createQuery("Select t From " + parametrizedType.getSimpleName() + " t", parametrizedType).getResultList();
    return result;
}

public T getById(Object id){
    return getEntityManager().find(parametrizedType, id);
}

@SuppressWarnings("unchecked")
public List<T> executeNativeQuery(String query){
    List<T> result = entityManager.createNativeQuery(query, parametrizedType).getResultList();
    return result;
}

public List<T> executeNamedQuery(String query){
    List<T> result = entityManager.createNamedQuery(query, parametrizedType).getResultList();
    return result;
}

@Transactional
public void save(T entity){
    entityManager.persist(entity);
}

@Transactional
public void modify(T entity){
    entityManager.merge(entity);
}

@Transactional
public T find(Object id){
    if(id!=null){
        return entityManager.find(this.parametrizedType, id);
    }
    return null;
}

@Transactional
public void delete(Object id){
    T t = find(id);
    if(t!=null){
        entityManager.remove(t);
    }
}

}`

声明我的DAO如下所示在启动我的应用程序时产生错误：

@Autowired
@Qualifier(value="partenaireDao")
private GenericDAO<VscPartenaire> partenaireDao;

错误是：

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean found for dependency ....: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true), @org.springframework.beans.factory.annotation.Qualifier(value=partenaireDao)}

at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound（DefaultListableBeanFactory.java:1463） at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency（DefaultListableBeanFactory.java:1094）在org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency（DefaultListableBeanFactory.java:1056）在org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor $ AutowiredFieldElement.inject（AutowiredAnnotationBeanPostProcessor.java:566）

但是没关系：

@Repository("partenaireDao")

公共类PartenaireDao扩展了GenericDAO {

public PartenaireDao() {
    super(VscPartenaire.class);
}

}

你可以告诉我第一次申报的错误吗？我不希望每个实体创建dao。

由于

Answer 1

你可以告诉我第一次申报的错误吗？

你是不带注释的genericDao类，因此该类不会被spring实例化。

我不想为每个实体创建dao。

然后将LoggedInGuard添加到@Repository("partenaireDao")类。

错误：找不到符合条件的限定bean

1 个答案: