使用基于Java的配置的Spring Hibernate-JPA org.springframework.beans.factory.NoSuchBeanDefinitionException

Question

大家好我在使用spring-JPA并在main方法中测试代码时遇到了一些麻烦我真的很感激，如果有人能告诉我这里缺少什么，或者可以指导我完成一个完整的教程。

这是我的配置类

@Configuration
@EnableJpaRepositories
public class Config  {

@Bean
public InsertExample insertExample() {
    return new InsertExample() ; 
}

@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
    LocalContainerEntityManagerFactoryBean emfb =   new LocalContainerEntityManagerFactoryBean() ; 
    emfb.setDataSource(dataSource());
    emfb.setPackagesToScan("com.solveit.insert");
    JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter() ;
    emfb.setJpaVendorAdapter(vendorAdapter);
    return emfb ; 
}

@Bean
public DataSource dataSource() {
    DriverManagerDataSource dataSource = new DriverManagerDataSource();
    dataSource.setDriverClassName("com.mysql.jdbc.Driver");
    dataSource.setUrl("jdbc:mysql://localhost:3306/datastore");
    dataSource.setUsername("root");
    dataSource.setPassword("nikolis");
    return dataSource ;
}

@Bean
public PlatformTransactionManager transactionManager(EntityManagerFactory emf){
    JpaTransactionManager transactionManager = new JpaTransactionManager() ;
    transactionManager.setEntityManagerFactory(emf); 
    return transactionManager ;
}

@Bean
public PersistenceExceptionTranslationPostProcessor exceptionTranslation() { 
    return new PersistenceExceptionTranslationPostProcessor() ; 
}

@Bean
public Properties hibernateProperties() {
    Properties hibernateProps = new Properties();
    hibernateProps.setProperty("hibernate.hbm2ddl.auto", "create");
    return hibernateProps;
}
}

这是我的存储库

 public interface ExampleRepository extends     CrudRepository<ExampleModel, Long> {
 List<ExampleModel> findByLastName(String lastName);
}

这是模型

@Entity 
public class ExampleModel {

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private long id;

    @Column
    private String klass ;

    @ElementCollection
    private List<Double> features ;

    public  ExampleModel() {

    }

    public ExampleModel(String klass, ArrayList<Double> features) {
        this.klass=klass ;
        this.features=features ; 
    }

    public String getKlass() {
        return klass;
    }

    public void setKlass(String klass) {
        this.klass = klass;
    }

    public ArrayList<Double> getFeatures() {
        return (ArrayList<Double>) features;
    }

    public void setFeatures(ArrayList<Double> features) {
        this.features = features;
    }

}

这是我的测试代码：

@Configuration
@Import({ Config.class })
public class InsertExample implements CommandLineRunner {

    @Autowired
    ExampleRepository repository ;

    public static void main(String args[]) throws FileNotFoundException{
         SpringApplication.run(InsertExample.class);
    }

    public void run(String... arg0) throws Exception {
        PrintStream out = new PrintStream(new FileOutputStream("output.txt"));


        ArrayList<Double> asdf = new ArrayList<Double>(); 
        asdf.add(23.123) ; 
        asdf.add(23.123) ; 
        asdf.add(23.123) ; 
        asdf.add(23.123) ; 
        ExampleModel example = new ExampleModel("first", asdf) ; 
        repository.save(example) ; 
    }
}

这是我得到的例外

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'insertExample': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.solveit.insert.ExampleRepository com.solveit.insert.InsertExample.repository; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.solveit.insert.ExampleRepository] 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:334)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1210)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:686)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:320)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:957)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:946)
at com.solveit.insert.InsertExample.main(InsertExample.java:33)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.solveit.insert.ExampleRepository com.solveit.insert.InsertExample.repository; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.solveit.insert.ExampleRepository] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:561)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
... 15 more
 Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.solveit.insert.ExampleRepository] 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.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1301)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1047)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:942)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:533)
... 17 more

Answer 1

您需要将此批注与包路径一起使用：

@EnableJpaRepositories("com.solveit.insert.hereyourrepositories")

UPD ：至少，你必须在更改@EnableJpaRepositories中的路径后执行此操作：

1.Spring boot config需要这种结构。 因为spring没有像JPA那样开始扫描需要初始化的bean。

http://docs.spring.io/spring-boot/docs/current/reference/html/using-boot-structuring-your-code.html

2.您只能使用JpaTransactionManager。

PlatformTransactionManager是接口，但JPATransactionManager是理解JPA的接口的实现。

您应该阅读Spring参考中的“事务管理”一章，以便更好地理解本主题。

http://docs.spring.io/spring/docs/3.0.4.RELEASE/spring-framework-reference/html/transaction.html

3. hibernateProps.setProperty（“hibernate.dialect”，“org.hibernate.dialect.MySQLInnoDBDialect”）;

它需要与JPA合作。

其他变化并不重要。