java - 在注入(inject)点 [BackedAnnotatedField] @Inject "Interface"带有限定符 @Default 的类型 "Implementation"的不满足依赖关系

Question

我想在 Maven 项目中使用 CDI+JSF+HIBERNATE+PRIMEFACES 的实现。我的 pom.xml 是这样的:

    <dependencies>
    <!-- PROJECT LOMBOK -->
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.16.6</version>
        <scope>provided</scope>
    </dependency>
    <!-- MYSQL -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.9</version>
    </dependency>
    <!-- HIBERNATE -->
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>3.6.3.Final</version>
    </dependency>
    <!-- CDI -->
    <dependency>
        <groupId>javax.enterprise</groupId>
        <artifactId>cdi-api</artifactId>
        <version>1.2</version>
    </dependency>
    <!-- SLF4j -->
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-simple</artifactId>
        <version>1.7.12</version>
    </dependency>
    <!-- PRIMEFACES -->
    <dependency>
        <groupId>org.primefaces</groupId>
        <artifactId>primefaces</artifactId>
        <version>5.2</version>
    </dependency>
</dependencies>

我的项目结构是这样的，我在不同的类中实现时使用通用接口(interface)。我在 3 个类中实现的一个接口(interface)IGenericDAO 我是这样在UserDao + PersonDao + RoleDao中实现的

public interface IGenericDAO<T> {

void save(T object);

void update(T object);

T getObjectById(int id);

List<T> getAll();  }

实现是

public class UserDAOImpl implements IGenericDAO<User> {

@Override
public void save(User user) {
    Session session = HibernateUtil.getSessionFactory().openSession();
    Transaction transaction = null;
    try {
        transaction = session.beginTransaction();
        session.save(user);
        transaction.commit();
    } catch (Exception e) {
        if (transaction != null)
            transaction.rollback();
        throw e;
    } finally {
        session.close();
        HibernateUtil.getSessionFactory().close();
    }
}

@Override
public void update(User user) {
    Session session = HibernateUtil.getSessionFactory().openSession();
    Transaction transaction = null;
    try {
        transaction = session.beginTransaction();
        session.update(user);
        transaction.commit();
    } catch (Exception e) {
        if (transaction != null)
            transaction.rollback();
        throw e;
    } finally {
        session.close();
        HibernateUtil.getSessionFactory().close();
    }
}

@Override
public User getObjectById(int id) {
    Session session = HibernateUtil.getSessionFactory().openSession();
    try {
        return (User) session.createCriteria(User.class).add(Restrictions.eq("id", id)).list().get(0);
    } catch (Exception e) {
        throw e;
    } finally {
        session.close();
        HibernateUtil.getSessionFactory().close();
    }
}

@SuppressWarnings("unchecked")
@Override
public List<User> getAll() {
    Session session = HibernateUtil.getSessionFactory().openSession();
    try {
        return session.createCriteria(User.class).list();
    } catch (Exception e) {
        throw e;
    } finally {
        session.close();
        HibernateUtil.getSessionFactory().close();
    }
}}

像这样我将服务编码为，我使用通用接口(interface)并在 3 个类中实现代码，如下所示:

public interface IGenericService<T> {

void save(T object);

void update(T object);

T getObjectById(int id);

List<T> getAll(); }

实现

@RequestScoped
public class UserServiceImpl implements IGenericService<User> {
@Setter
@Inject
private IGenericDAO<User> dao;

@Override
public void save(User user) {
    dao.save(user);
}

@Override
public void update(User user) {
    dao.update(user);
}

@Override
public User getObjectById(int id) {
    return dao.getObjectById(id);
}

@Override
public List<User> getAll() {
    return dao.getAll();
}}

最后，ManagedBean 是这样的:

@Named(value = "authentication")

@RequestScoped公共(public)类 AuthenticationBean 实现序列化 {

private static final long serialVersionUID = 2288439665206779666L;

@Getter
@Setter
private String message;

@Setter
@Inject
private IGenericService<User> userService;

@PostConstruct
public void init() {
    message = userService.getObjectById(1).getLastname();
}}

每次我运行 glassfish 服务器时都会出现这个错误: 异常 0:org.jboss.weld.exceptions.DeploymentException:WELD-001408:不满足类型 IGenericDAO 与限定符 @Default 的依赖关系 在注入(inject)点 [BackedAnnotatedField] @Inject private ma.salaried.service.impl.PaymentServiceImpl.dao

Answer 1

我通过在 DAO 的实现和实现 od 服务中添加 @RequestScoped 解决了这个问题(在我所有的 DAO IMPL 和 Service Impl 中)

@RequestScoped public class EmployeeDAOImpl implements IGenericDAO<Employee> {

@Override
public void save(Employee Employee) {
    Session session = HibernateUtil.getSessionFactory().openSession();
    Transaction transaction = null;
    try {
        transaction = session.beginTransaction();
        session.save(Employee);
        transaction.commit();
    } catch (Exception e) {
        if (transaction != null)
            transaction.rollback();
        throw e;
    } finally {
        session.close();
        HibernateUtil.getSessionFactory().close();
    }
}

@Override
public void update(Employee Employee) {
    Session session = HibernateUtil.getSessionFactory().openSession();
    Transaction transaction = null;
    try {
        transaction = session.beginTransaction();
        session.update(Employee);
        transaction.commit();
    } catch (Exception e) {
        if (transaction != null)
            transaction.rollback();
        throw e;
    } finally {
        session.close();
        HibernateUtil.getSessionFactory().close();
    }
}

@Override
public Employee getObjectById(int id) {
    Session session = HibernateUtil.getSessionFactory().openSession();
    try {
        return (Employee) session.createCriteria(Employee.class).add(Restrictions.eq("id", id)).list().get(0);
    } catch (Exception e) {
        throw e;
    } finally {
        session.close();
        HibernateUtil.getSessionFactory().close();
    }
}

@SuppressWarnings("unchecked")
@Override
public List<Employee> getAll() {
    Session session = HibernateUtil.getSessionFactory().openSession();
    try {
        return session.createCriteria(Employee.class).list();
    } catch (Exception e) {
        throw e;
    } finally {
        session.close();
        HibernateUtil.getSessionFactory().close();
    }
}

和这样的服务

@RequestScoped公共(public)类 EmployeeServiceImpl 实现 IGenericService {

@Setter
@Inject
private IGenericDAO<Employee> dao;

@Override
public void save(Employee Employee) {
    dao.save(Employee);
}

@Override
public void update(Employee Employee) {
    dao.update(Employee);
}

@Override
public Employee getObjectById(int id) {
    return dao.getObjectById(id);
}

@Override
public List<Employee> getAll() {
    return dao.getAll();
}}