java - Spring JpaConfiguration 在运行服务器时给出异常

Question

我尝试配置 JpaConfiguration 以与 jetty 和 H2 一起使用(仅用于测试)。当我运行服务器时，我收到错误。但我不明白原因。

我正在使用 spring-data-jpa。

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(basePackages = "my.package.model.repository")
@ComponentScan(basePackages = {"my.package.model.services"})
public class JpaConfiguration {

    @Bean
    public DataSource dataSource() throws SQLException {
        EmbeddedDatabaseBuilder builder = new EmbeddedDatabaseBuilder();
        return builder.setType(EmbeddedDatabaseType.H2).build();
    }

    @Bean
    public EntityManagerFactory entityManagerFactory() throws SQLException {

        HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        vendorAdapter.setGenerateDdl(true);

        LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
        factory.setJpaVendorAdapter(vendorAdapter);
        factory.setPackagesToScan("my.package.model.entity");
        factory.setDataSource(dataSource());
        factory.afterPropertiesSet();
        factory.setPersistenceUnitName("test");
        return factory.getObject();
    }

    @Bean
    public EntityManager entityManager(EntityManagerFactory entityManagerFactory) {
        return entityManagerFactory.createEntityManager();
    }

    @Bean
    public PlatformTransactionManager transactionManager() throws SQLException {
        JpaTransactionManager txManager = new JpaTransactionManager();
        txManager.setEntityManagerFactory(entityManagerFactory());
        return txManager;
    }

    @Bean
    public HibernateExceptionTranslator hibernateExceptionTranslator() {
        return new HibernateExceptionTranslator();
    }

}

错误是:

2013-11-29 13:36:33.042:WARN::Nested in org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'memberService': Injection o
f autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private my.package.model.repository.MemberRepository my.package.model.services.MemberServiceImpl.memberRepository; nested exception is org.springframework.beans.f
actory.BeanCreationException: Error creating bean with name 'memberRepository': Cannot create inner bean '(inner bean)' of type [org.springframework.orm.jp
a.SharedEntityManagerCreator] while setting bean property 'entityManager'; nested exception is org.springframework.beans.factory.BeanCreationException: Err
or creating bean with name '(inner bean)#1': Cannot resolve reference to bean 'entityManagerFactory' while setting constructor argument; nested exception i
s org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [my/package/config/JpaConfiguration.class]: No matching factory method found: factory bean 'jpaConfiguration'; factory method 'entityManagerFactory()'. Check tha
t a method with the specified name exists and that it is non-static.:
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [my/package/config/JpaConfiguration.class]: No matching factory method found: factory bean 'jpaConfiguration'; factory method 'entityManagerFactory()'. Check that
a method with the specified name exists and that it is non-static.
        at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:536)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.ja
va:1055)

非常感谢您的帮助。

Answer 1

您可以通过更简单的方式来实现:您需要一个以 LocalContainerEntityManagerFactoryBean 作为返回类型的方法。然后，您可以在任何您想要的地方注入(inject) EntityManager bean，而无需任何其他麻烦。

public class JpaConfiguration {

@Bean
public DataSource dataSource() throws SQLException {
    EmbeddedDatabaseBuilder builder = new EmbeddedDatabaseBuilder();
    return builder.setType(EmbeddedDatabaseType.H2).build();
}

@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() throws SQLException {

    HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
    vendorAdapter.setGenerateDdl(true);

    LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
    factory.setJpaVendorAdapter(vendorAdapter);
    factory.setPackagesToScan("my.package.model.entity");
    factory.setDataSource(dataSource());
    factory.afterPropertiesSet();
    factory.setPersistenceUnitName("test");
    return factory;
}

//remainder configuration for trasnactions and so on
}


@Service
public class Service{
    @PersistenceContext(unitName = "test")
    private EntityManager em;
}