Question

我有一个带有2个数据库配置的Spring Boot项目。

主数据库配置：

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(transactionManagerRef = "primaryTransactionManager", entityManagerFactoryRef = "primaryEntityManagerFactory", basePackages = { "com.example.repository.primary" })
public class PrimaryDbConfig {

    @Primary
    @Bean(name = "primaryDataSource")
    @ConfigurationProperties(prefix = "spring.primary.datasource")
    public DataSource dataSource() {
        return DataSourceBuilder.create().build();
    }

    @Primary
    @Bean(name = "primaryEntityManagerFactory")
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(EntityManagerFactoryBuilder builder,         @Qualifier("primaryDataSource") DataSource dataSource) {
        return builder.dataSource(dataSource).packages("com.example.domain.primary").persistenceUnit("primary-persistence-unit").build();
    }

    @Primary
    @Bean(name = "primaryTransactionManager")
    public PlatformTransactionManager transactionManager(@Qualifier("primaryEntityManagerFactory") EntityManagerFactory entityManagerFactory) {
        return new JpaTransactionManager(entityManagerFactory);
    }
}

中学：

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(entityManagerFactoryRef = "secondaryEntityManagerFactory", transactionManagerRef = "secondaryTransactionManager", basePackages = { "com.example.repository.secondary" })
public class SecondaryDbConfig {

    @Bean(name = "secondaryDataSource")
    @ConfigurationProperties(prefix = "spring.secondary.datasource")
    public DataSource dataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "secondaryEntityManagerFactory")
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(EntityManagerFactoryBuilder builder,         @Qualifier("secondaryDataSource") DataSource dataSource) {
        return builder.dataSource(dataSource).packages("com.example.domain.secondary").persistenceUnit("secondary-persistence-unit").build();
    }

    @Bean(name = "secondaryTransactionManager")
    public PlatformTransactionManager transactionManager(@Qualifier("secondaryEntityManagerFactory") EntityManagerFactory entityManagerFactory) {
        return new JpaTransactionManager(entityManagerFactory);
    }
}

有加载第二个DB的实体：

@Entity
@Table(name = "users")
public class User {

    @OneToMany(mappedBy = "user")
    private List<Company> companies;

使用：

public interface UserRepository extends JpaRepository<User, Long> {
    User findByEmail(String email);
}

当我使用UserRepository时，会检索到User，但当我点击加载公司时，我会com.sun.jdi.InvocationException occurred invoking method. - com.sun.jdi.InvocationException occurred invoking method。如果我将SecondaryDbConfig更改为@Primary或添加fetch = FetchType.EAGER，则会按预期检索公司。我尝试添加@Transactional(transactionManager="secondaryTransactionManager")，但它没有帮助。

我错过了什么？使用非主数据库配置时，延迟加载实体属性的正确方法是什么？

Answer 1

尝试将@Transactional添加到检索公司列表的@Service方法或控制器中。

祝你好运！

带有2个数据库配置的Spring Boot - 使用第二个配置的延迟加载不起作用

1 个答案: