Spring Boot-使用多个数据源时，JpaRepository无法初始化

时间：2018-12-14 09:22:56

标签： java spring spring-boot jpa spring-data-jpa

我对Spring Boot以及通过JpaRepositories使用具有多个数据源的设置有疑问。

[下面有4个修改]

项目的结构如下： com/mycompany/schema/AbstractJpaConfig com/mycompany/schema/domain_A/AJpaConfiguration com/mycompany/schema/domain_A/entity/AEntity com/mycompany/schema/domain_A/repository/ARepository com/mycompany/schema/domain_B/BJpaConfiguration com/mycompany/schema/domain_B/entity/BEntity com/mycompany/schema/domain_B/repository/BRepository

所以我有两个域（A和B），分别处理DataSource设置。

抽象的JPA配置类用于减少冗余，并使用处理数据源的自定义DataSourceManager：

public abstract class AbstractJpaConfiguration {

    private final DataSourceManager dataSources;

    public AbstractJpaConfiguration(DataSourceManager dataSources) {
        this.dataSources = dataSources;
    }

    protected abstract String persistenceUnitName();

    protected abstract Class<?> packageEntityClass();

    protected abstract DataSource useDataSource(DataSourceManager dataSources);

    public abstract LocalContainerEntityManagerFactoryBean entityManagerFactoryBean();

    public abstract PlatformTransactionManager transactionManagerBean();

    public abstract LocalContainerEntityManagerFactoryBean getEntityManagerFactoryBean();

    protected LocalContainerEntityManagerFactoryBean buildEntityManagerFactory() {
        LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
        em.setDataSource(useDataSource(dataSources));
        em.setPersistenceUnitName(persistenceUnitName() + "PU");
        em.setBeanName(persistenceUnitName() + "EntityManager");
        em.setPackagesToScan(packageEntityClass().getPackage().getName());
        em.setJpaPropertyMap(persistenceProperties());
        em.setJpaVendorAdapter(jpaVendorAdapter());
        return em;
    }

    protected Map<String, String> persistenceProperties() {
        Map<String, String> properties = new HashMap<>();
        properties.put("hibernate.hbm2ddl.auto", "validate");
        return properties;
    }

    protected JpaVendorAdapter jpaVendorAdapter() {
        HibernateJpaVendorAdapter adapter = new HibernateJpaVendorAdapter();
        adapter.setShowSql(false);
        adapter.setGenerateDdl(false);
        return adapter;
    }

    protected PlatformTransactionManager buildTransactionManager() {
        LocalContainerEntityManagerFactoryBean emfBean = getEntityManagerFactoryBean();
        EntityManagerFactory emf = emfBean.getObject();
        return new JpaTransactionManager(emf);
    }
}

位于域A包中的配置实现如下所示：

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        basePackages = "com.mycompany.schema.domain_A",
        entityManagerFactoryRef = "AEntityManagerFactory",
        transactionManagerRef = "ATransactionManager")
@EntityScan(basePackages = "com.mycompany.schema.domain_A")
@DependsOn("flywayMigrationInitializer")
public class AJpaConfiguration extends AbstractJpaConfiguration {

    @Autowired
    public AJpaConfiguration(DataSourceManager dataSources) {
        super(dataSources);
    }

    @Override
    protected Class<?> packageEntityClass() {
        return getClass(); // This class is located in the entity class package
    }

    @Override
    protected String persistenceUnitName() {
        return "a";
    }

    @Override
    protected DataSource useDataSource(DataSourceManager dataSources) {
        return dataSources.domainADataSource();
    }

    @Bean("aEntityManagerFactory")
    @Override
    public LocalContainerEntityManagerFactoryBean entityManagerFactoryBean() {
        return buildEntityManagerFactory();
    }

    @Bean("aTransactionManager")
    @Override
    public PlatformTransactionManager transactionManagerBean() {
        return buildTransactionManager();
    }

    @Override
    public LocalContainerEntityManagerFactoryBean getEntityManagerFactoryBean() {
        return entityManagerFactoryBean();
    }
}

然后，将实际存储库定义为JpaRepository：

@Repository
public interface ARepository extends JpaRepository<AEntity, Long> {
}

根据应用程序日志，似乎有效：

2018-12-14 09:45:02.997  INFO 13867 --- [  restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Multiple Spring Data modules found, entering strict repository configuration mode!
2018-12-14 09:45:02.997  INFO 13867 --- [  restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data repositories in DEFAULT mode.
2018-12-14 09:45:03.012  INFO 13867 --- [  restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 9ms. Found 1 repository interface.
2018-12-14 09:45:03.029  INFO 13867 --- [  restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Multiple Spring Data modules found, entering strict repository configuration mode!
2018-12-14 09:45:03.029  INFO 13867 --- [  restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data repositories in DEFAULT mode.
2018-12-14 09:45:03.085  INFO 13867 --- [  restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 56ms. Found 1 repository interface.

然后，以及成功的Flyway迁移，将启动持久性单元：

2018-12-14 09:45:06.459  INFO 13867 --- [  restartedMain] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [
    name: aPU
    ...]
2018-12-14 09:45:06.544  INFO 13867 --- [  restartedMain] org.hibernate.Version                    : HHH000412: Hibernate Core {5.3.7.Final}
2018-12-14 09:45:06.546  INFO 13867 --- [  restartedMain] org.hibernate.cfg.Environment            : HHH000206: hibernate.properties not found
2018-12-14 09:45:06.746  INFO 13867 --- [  restartedMain] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {5.0.4.Final}
2018-12-14 09:45:06.922  INFO 13867 --- [  restartedMain] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.MySQL57Dialect
2018-12-14 09:45:07.976  INFO 13867 --- [  restartedMain] o.h.h.i.QueryTranslatorFactoryInitiator  : HHH000397: Using ASTQueryTranslatorFactory
2018-12-14 09:45:08.066  INFO 13867 --- [  restartedMain] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'aPU'

但是，当我尝试将存储库自动连接到服务中时：

@Service
public class MyService {
    private final ARepository repository;

    @Autowired
    public MyService(ARepository repository) {
        this.repository = repository;
    }

    // ...
}

这是我在日志中收到的错误消息：

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'MyService' defined in URL [jar:file:...]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.mycompany.schema.domain_A.repository.ARepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:767) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:218) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1308) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1154) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:538) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:273) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1239) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1166) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:855) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:758) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    ... 106 common frames omitted
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.mycompany.schema.domain_A.repository.ARepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1646) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1205) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1166) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:855) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:758) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
    ... 120 common frames omitted

我希望所提供的信息可以帮助解决此问题。
如果没有，我将很乐意提供其他信息。

感谢您的时间，并度过愉快的一天
 -亚历山大

---编辑---

我在配置类中添加了两个断点，并获得了一些新信息：

调用了创建LocalContainerEntityManagerFactoryBean的方法，但是由于在调用PlatformTransactionManager bean方法之前缺少bean，应用程序停止了。

我忽略了一个问题，该服务需要JpaRepository子类型，正在实现Spring Security UserDetailsManager接口。 似乎Spring Security系统正在尝试实例化UserDetailsManager服务，然后才能创建@EnableJpaRepositories拾取的JpaRepository Bean。

有什么解决办法吗？

---编辑2 ---

我尝试@Import AJpaConfiguration类，它没有做任何更改。 但是，仔细查看Bean实例化日志，我发现了以下消息：

2018-12-14 11:52:08.395 DEBUG 22417 --- [  restartedMain] o.s.b.f.s.DefaultListableBeanFactory     : Creating shared instance of singleton bean 'aEntityManagerFactory'
2018-12-14 11:52:08.395 DEBUG 22417 --- [  restartedMain] o.s.b.f.s.DefaultListableBeanFactory     : Creating shared instance of singleton bean 'aJpaConfig'

因此，Spring Boot正在为LocalContainerEntityManagerFactoryBean选择@Bean注释，但既没有创建EntityManagerFactory实例，也没有为PlatformTransactionManager选择@Bean注释。

---编辑3 ---

我设置了@Autowired选项required = false，现在它正在拾取bean并实例化存储库-但仅在实例化需要它们的服务之后才将它们注入。

2018-12-14 13:25:30.484 DEBUG 31932 --- [  restartedMain] o.s.b.f.s.DefaultListableBeanFactory     : Creating shared instance of singleton bean 'aEntityManager'
2018-12-14 13:25:33.035 DEBUG 31932 --- [  restartedMain] o.s.b.f.s.DefaultListableBeanFactory     : Creating shared instance of singleton bean 'aTransactionManager'
2018-12-14 13:25:34.852 DEBUG 31932 --- [  restartedMain] o.s.b.f.s.DefaultListableBeanFactory     : Creating shared instance of singleton bean 'aRepository'

我该如何先创建bean？这似乎可以解决问题。

---编辑4 ---

感谢@RobertNiestroj的技巧，我在@Lazy批注中添加了@Autowired，这使它们在存储库之后被初始化。

但是现在，出现了另一个错误：
java.lang.IllegalArgumentException: interface com.mycompany.schema.domain_A.repository.ARepository is not visible from class loader

我还应该提到此应用程序是基于Maven模块构建的：   -模式模块（JPA配置，存储库和实体类）   -核心模块（应用程序配置和属性类）   -[其他使用Core和Schema的模块]   -主模块（Spring-Boot应用程序类）

2 个答案:

答案 0 :(得分：0)

请尝试如下自动接线并检查

@Service
public class MyService {

    @Autowired
    private ARepository repository;

    // ...
}

答案 1 :(得分：0)

您是否尝试过@Repository（name =“ repository”）？ IIRC通过不提供名称来创建具有与该类匹配的名称的组件，在本例中为“ aRepository”。因此，当自动装配存储库变量时，没有名为“ repository”的组件，从而导致没有合格的Bean异常。

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