봄 일반 Hibernate DAO

Question

모든 Hibernate DAO 클래스가 상속하는 Generic Hibernate DAO 클래스를 작성 중이다. 클래스에 대한 종속성을 주입하기 위해 봄을 사용하려고하지만 예외가 발생합니다. 나는이 프로그램을 실행할 때

@Repository 
public class HibernateDaoImpl <T> implements Dao<T>{ 
    @Autowired 
    private SessionFactory sessionFactory; 
    @Autowired 
    private Class<T> clazz; 

    //setter & getter 

    public HibernateDaoImpl (Class<T> clazz) 
    { 
     this.clazz = clazz; 
    } 
    public Session getCurrentSession() 
    { 
     return sessionFactory.getCurrentSession(); 
    } 

    public void save(T t) 
    { 
     getCurrentSession().save(t); 
    } 

    public void update(T t) 
    { 
     getCurrentSession().update(t); 
    } 


    @SuppressWarnings("unchecked") 
    public T findById(Object object) 
    { 
     return (T) getCurrentSession().get(clazz, (Serializable)object); 
    } 

    @SuppressWarnings("unchecked") 
    public List<T> findAll(int page, int maxResult) 
    { 
     return getCurrentSession().createQuery(String.format("FROM %s", clazz.getSimpleName())).list(); 
    } 

내 파생 클래스는

public class SubscriberHibernateDao extends HibernateDaoImpl<Subscriber> implements SubscriberDao { 

    public SubscriberHibernateDao() 
    { 
     super(Subscriber.class); 
    } 
} 

내 스프링 XML은

<bean id="subscriber" class="com.example.model.Subscriber" autowire="byName"> 
    <property name="email" value="mdennis10"></property> 
</bean> 

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"> 
    <property name="driverClassName" value="com.mysql.jdbc.Driver"/> 
    <property name="url" value="jdbc:mysql://localhost/kyro"/> 
    <property name="username" value="root"/> 
</bean> 

<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> 
    <property name="dataSource" ref="dataSource"/> 
    <property name="packagesToScan" value="com.kyrogaming.model"/> 
    <property name="hibernateProperties"> 
     <props> 
      <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop> 
      <prop key="hibernate.cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</prop> 
      <prop key="hibernate.show_sql">true</prop> 
     </props> 
    </property> 
</bean> 

<bean id="subcriberDao" class="com.example.dao.SubscriberHibernateDao"> 
<property name="clazz" value="com.example.model.Subscriber"></property> 
</bean> 

나는 다음과 같은 스택 추적을 얻을

: 조직 :에 의해

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hibernateDaoImpl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.lang.Class com.example.dao.HibernateDaoImpl.clazz; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [java.lang.Class] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} 
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:288) 
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1116) 
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519) 
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458) 
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:295) 
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223) 
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292) 
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) 
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:626) 
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932) 
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479) 
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139) 
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83) 
at com.kyrogaming.test.BeanTest.test(BeanTest.java:18) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.lang.reflect.Method.invoke(Method.java:606) 
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47) 
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) 
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44) 
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) 
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271) 
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70) 
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) 
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238) 
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) 
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) 
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53) 
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) 
at org.junit.runners.ParentRunner.run(ParentRunner.java:309) 
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) 
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) 

를 일으켰습니다 .springframework.beans.factory.BeanCreationEx ception : 필드를 autowire 할 수 없습니다 : private java.lang.Class com.example.dao.HibernateDaoImpl.clazz; 중첩 예외는 org.springframework.beans.factory.NoSuchBeanDefinitionException입니다 : [java.lang.Class] 유형의 적격 bean이 종속성에 대해 발견되지 않았습니다.이 종속성에 대한 autowire 후보로 적합한 적어도 하나의 bean이 필요합니다. 종속성 주석 : org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor $ AutowiredFieldElement.inject (AutowiredAnnotationBeanPostProcessor.java:514) 에서 {@ org.springframework.beans.factory.annotation.Autowired (필수 = true)} 에서 org. org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues에서 springframework.beans.factory.annotation.InjectionMetadata.inject (InjectionMetadata.java:87) (AutowiredAnnotationBeanPostProcessor.java:285) ... (36) 이상은 의해 발생 : org.springframework.beans.factory.NoSuchBeanDefinitionException : [java.lang.Class] 유형의 적격 bean이 종속성에 대해 발견되지 않았습니다.이 종속성에 대한 자동 작성 후보로 적합한 적어도 하나의 bean이 필요합니다. 종속성 주석 : org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException (DefaultListableBeanFactory.java:986)의 에서 {@ org.springframework.beans.factory.annotation.Autowired (필수 = true)} 에서 org.springframework. 콩고. AutowiredAnnotationBeanPostProcessor $ AutowiredFieldElement.inject (AutowiredAnnotationBeanPostProcessor.java:486) ... 38 more

어떻게 해결할 수 있습니까?

Answer 1

@Autowired 
private Class<T> clazz; 

봄에는 Autowire를 알 수 없기 때문에 코드의이 줄은 작동하지 않습니다. 타입이나 작업 클래스에 의해서만 자동 와이어 링을 할 수 있습니다.

래퍼 개체에이 클래스를 래핑하여 형식으로 자동 와이어를 수행 한 다음 해당 형식을 DAO에 삽입 할 수 있도록해야합니다. 나는 아래의 답을 제공 한

@Autowired 
private Entity<T> entity;