Làm sao để cấu hình tới 2 database trong 1 project spring boot?

Spring JPA kết nối nhiều datasource sử dụng annotation nó sẽ kiểu thế này:

@Data
public class DataSourceProperties {
    private final String driverClassName;
    private final String jdbcUrl;
    private final String username;
    private final String password;
}

@ConfigurationProperties(prefix = "hibernate")
public class HibernateProperties extends Properties {
    private static final long serialVersionUID = -817908147155147987L;
}

import javax.sql.DataSource;

public final class JpaConfigurations {
    private JpaConfigurations() {
    }

    public static  D createDataSource(
        DataSourceProperties properties,
        Class dataSourceClass
    ) {
        return DataSourceBuilder
            .create()
            .driverClassName(properties.getDriverClassName())
            .url(properties.getJdbcUrl())
            .username(properties.getUsername())
            .password(properties.getPassword())
            .type(dataSourceClass)
            .build();
    }

    public static EntityManagerFactory createEntityManagerFactory(
        DataSource dataSource,
        HibernateProperties hibernateProperties,
        String packageToScan
    ) {
        final LocalContainerEntityManagerFactoryBean factory =
            new LocalContainerEntityManagerFactoryBean();
        factory.setJpaVendorAdapter(new HibernateJpaVendorAdapter());
        factory.setPackagesToScan(packageToScan);
        factory.setDataSource(dataSource);
        factory.setJpaProperties(hibernateProperties);
        factory.afterPropertiesSet();
        return factory.getObject();
    }

    public static JpaTransactionManager createJpaTransactionManager(
        EntityManagerFactory entityManagerFactory
    ) {
        return new JpaTransactionManager(entityManagerFactory);
    }
}

import javax.sql.DataSource;

@AllArgsConstructor
public class EzyDataSourceFactory {
    private final Map dataSourcePropertiesByChainId;
    private final Environment environment;
    private final String hikariDataSourcePropertyPrefix;

    public DataSource createDataSource(String datasourceId) {
        final HikariDataSource dataSource = JpaConfigurations.createDataSource(
            dataSourcePropertiesByChainId.get(datasourceId),
            HikariDataSource.class
        );
        final Binder binder = Binder.get(environment);
        binder.bind(hikariDataSourcePropertyPrefix, Bindable.ofInstance(dataSource));
        return dataSource;
    }
}

import javax.sql.DataSource;

@AllArgsConstructor
public class EzyEntityManagerFactoryFactory {

    private final EzyDataSourceFactory exampleDataSourceFactory;
    private final HibernateProperties hibernateProperties;
    private final String packageToScan;

    public EntityManagerFactory createEntityManagerFactory(String datasourceId) {
        return createEntityManagerFactory(datasourceId, null);
    }

    public EntityManagerFactory createEntityManagerFactory(
        String datasourceId,
        DataSource dataSource
    ) {
        return JpaConfigurations.createEntityManagerFactory(
            dataSource != null ? dataSource : exampleDataSourceFactory.createDataSource(datasourceId),
            hibernateProperties,
            packageToScan
        );
    }
}

@AllArgsConstructor
public class EzyJpaRepositoryFactory {
    private final EzyJpaTransactionManagerFactory ezyJpaTransactionManagerFactory;

    public <T, I, R extends JpaRepository> R createJpaRepository(
        String datasourceId,
        Class jpaRepositoryClass,
        JpaTransactionManager jpaTransactionManager
    ) {
        final JpaTransactionManager actualJpaTransactionManager =
            jpaTransactionManager == null
            ? jpaTransactionManager
            : ezyJpaTransactionManagerFactory.createJpaTransactionManager(datasourceId);
        final EntityManagerFactory entityManagerFactory =
            actualJpaTransactionManager.getEntityManagerFactory();
        assert entityManagerFactory != null;
        final EntityManager entityManager =
            SharedEntityManagerCreator.createSharedEntityManager(entityManagerFactory);
        final JpaRepositoryFactory jpaRepositoryFactory = new JpaRepositoryFactory(entityManager);
        final TransactionInterceptor transactionInterceptor = new TransactionInterceptor(
            (TransactionManager) actualJpaTransactionManager,
            new AnnotationTransactionAttributeSource()
        );
        jpaRepositoryFactory.addRepositoryProxyPostProcessor((factory, repositoryInformation) ->
            factory.addAdvice(transactionInterceptor)
        );
        return jpaRepositoryFactory.getRepository(jpaRepositoryClass);
    }

    public <T, I, R extends JpaRepository> R createJpaRepositoryWithAspects(
        String datasourceId,
        Class jpaRepositoryClass,
        JpaTransactionManager jpaTransactionManager,
        Object... aspects
    ) {
        final R nakedJpaRepository = createJpaRepository(datasourceId, jpaRepositoryClass, jpaTransactionManager);
        final AspectJProxyFactory proxyFactory = new AspectJProxyFactory(nakedJpaRepository);
        for (Object aspect : aspects) {
            proxyFactory.addAspect(aspect);
        }
        return proxyFactory.getProxy();
    }
}

@AllArgsConstructor
public class EzyJpaTransactionManagerFactory {
    private final EzyEntityManagerFactoryFactory ezyEntryManagerFactoryFactory;

    public JpaTransactionManager createJpaTransactionManager(String datasourceId) {
        return createJpaTransactionManager(datasourceId, null);
    }

    public JpaTransactionManager createJpaTransactionManager(
        String datasourceId,
        EntityManagerFactory entityManagerFactory
    ) {
        return JpaConfigurations.createJpaTransactionManager(
            entityManagerFactory != null
                ? entityManagerFactory
                : ezyEntryManagerFactoryFactory.createEntityManagerFactory(datasourceId)
        );
    }
}

Em có thể paste cả exception lên đây không? (sử dụng thẻ pre nhé). Còn nhìn vào câu hỏi của em thì anh thấy lỗi này xảy ra khi trong code của em khai báo 2 đối tượng có cùng tên `mmTransactionManager`, em thử tìm kiếm xem có không và đặt 2 tên khác nhau nhé.