如何修復從Spring Data Jpa使用CrudRepository時的NoSuchBeanDefinitionException？

Question

的同事，我'嘗試使用Spring庫界面污物從數據庫獲取數據：

@Component 
public interface AssetsGapSortDAO extends CrudRepository<AssetsGapSortEntity, Integer> { 
    AssetsGapSortEntity getByIsin(String ISIN); 
} 

JPA實體的樣子：

@Entity 
@Table(name = "Assets", schema = "dbo", catalog = "") 
public class AssetsGapSortEntity { 
    private BigInteger id; 

    private String shortName; 
    private String isin; 
    private int registrationDate; 
    /*Some other properties*/ 

    @Basic 
    @Column(name = "id") 
    public BigInteger getId() { 
     return id; 
    } 

    public void setId(BigInteger id) { 
     this.id = id; 
    } 


    @Id 
    @Column(name = "ShortName") 
    public String getShortName() { 
     return shortName; 
    } 

    public void setShortName(String shortName) { 
     this.shortName = shortName; 
    } 


    @Basic 
    @Column(name = "ISIN") 
    public String getIsin() { 
     return isin; 
    } 

    public void setIsin(String isin) { 
     this.isin = isin; 
    } 

    /*Equals and hashcode methods*/ 


    @Override 
    public String toString() { 
     ToStringStyle style = new NotNullToStringStyle(); 
     return ToStringBuilder.reflectionToString(this, style); 
    } 


} 

當我運行JUnit測試：

@RunWith(SpringJUnit4ClassRunner.class) 
@ContextConfiguration(classes = OlmeSmbConfig.class, loader = AnnotationConfigContextLoader.class) 
public class AssetsGapSortDAOTest { 
    private static final Logger log = LoggerFactory.getLogger(ExtractionsDAOTest.class); 

    @Autowired 
    AssetsGapSortDAO assetsGapSortDAO; 

    @Test 
    public void getByIsin() throws Exception { 
     log.info(assetsGapSortDAO.getByIsin("TT0W3888254").toString()); 
    } 

} 

我收到naxt stackTrace：

java.lang.IllegalStateException: Failed to load ApplicationContext 

    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124) 
    at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:83) 
.... 
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144) 
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'assetInfoLoader': Unsatisfied dependency expressed through field 'assetsGapSortDAO'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.comp.olme.jpa.dao.GapSort.AssetsGapSortDAO' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588) 
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) 
    .... 
    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116) 
    ... 29 more 
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.comp.olme.jpa.dao.GapSort.AssetsGapSortDAO' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1474) 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1102) 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1064) 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585) 
    ... 45 more 

我的配置是這樣的：

@Configuration 
@EnableTransactionManagement 
@ComponentScan (basePackages = {"com.comp.olme"}) 
@PropertySource("classpath:OlmeSmb-${env}.properties") 
@EnableScheduling 
public class OlmeSmbConfig { 
/*There are DataSource, EntityManagerFactory beans etc....*/ 
} 

當我用簡單的JPA一切工作正常，但我想嘗試CrudRepository。 所以問題是爲什麼我收到NoSuchBeanDefinitionException以及如何解決它？ 謝謝。

UPDATE

根據@javaguy建議我加入到我的配置@EnableJpaRepositories註釋：

@EnableJpaRepositories(basePackages="com.comp.olme", entityManagerFactoryRef ="emGapSort", transactionManagerRef = "txManagerGapSort") 

和 「NoSuchBeanDefinitionException」 是固定的，但新的提高：

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name '(inner bean)#3e4e8fdf': Unsatisfied dependency expressed through method 'createSharedEntityManager' parameter 0: 
Could not convert argument value of type [com.sun.proxy.$Proxy44] to required type [javax.persistence.EntityManagerFactory]: 
Failed to convert value of type 'com.sun.proxy.$Proxy44 implementing org.hibernate.jpa.HibernateEntityManager,org.springframework.orm.jpa.EntityManagerProxy' to required type 'javax.persistence.EntityManagerFactory'; 
nested exception is java.lang.IllegalStateException: 
Cannot convert value of type 'com.sun.proxy.$Proxy44 implementing org.hibernate.jpa.HibernateEntityManager,org.springframework.orm.jpa.EntityManagerProxy' to required type 'javax.persistence.EntityManagerFactory': 
no matching editors or conversion strategy found 
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:723) 
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:467) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1134) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1028) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) 
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:299) 
    ... 58 more 

可能是因爲我在Spring Config中有多個數據源（有兩個用於diffe租DB）？如何解決它？ 很抱歉，如果它的範圍...

Answer 1

spring-data自動提供實現你的DAO（庫）班（即，爲您AssetsGapSortDAO接口），但你需要告訴您的倉庫類都可以找到。因此，請將@EnableJpaRepositories(basePackages="com.yourproject")級別註釋添加到您的OlmeSmbConfig類中以掃描存儲庫。

我建議你參考here瞭解春季數據的工作原理。

另外，我建議你來註釋AssetsGapSortDAO作爲@Repository而非@Component（即使在技術上它工作，標誌着@Repository使得對存儲庫/ DAO類更清晰）。