diff --git a/ddd/src/main/java/com/baeldung/dddhexagonalspring/infrastracture/repository/cassandra/SpringDataCassandraOrderRepository.java b/ddd/src/main/java/com/baeldung/dddhexagonalspring/infrastracture/repository/cassandra/SpringDataCassandraOrderRepository.java
index ca460fb2c7..3c89bd1b23 100644
--- a/ddd/src/main/java/com/baeldung/dddhexagonalspring/infrastracture/repository/cassandra/SpringDataCassandraOrderRepository.java
+++ b/ddd/src/main/java/com/baeldung/dddhexagonalspring/infrastracture/repository/cassandra/SpringDataCassandraOrderRepository.java
@@ -5,8 +5,6 @@ import java.util.UUID;
 import org.springframework.data.cassandra.repository.CassandraRepository;
 import org.springframework.stereotype.Repository;
 
-import com.baeldung.dddhexagonalspring.domain.Order;
-
 @Repository
 public interface SpringDataCassandraOrderRepository extends CassandraRepository<OrderEntity, UUID>{
 
diff --git a/ddd/src/main/java/com/baeldung/dddhexagonalspring/infrastracture/repository/mongo/MongoDbOrderRepository.java b/ddd/src/main/java/com/baeldung/dddhexagonalspring/infrastracture/repository/mongo/MongoDbOrderRepository.java
index f5d7b8f6c1..e14cb88f5a 100644
--- a/ddd/src/main/java/com/baeldung/dddhexagonalspring/infrastracture/repository/mongo/MongoDbOrderRepository.java
+++ b/ddd/src/main/java/com/baeldung/dddhexagonalspring/infrastracture/repository/mongo/MongoDbOrderRepository.java
@@ -1,14 +1,14 @@
 package com.baeldung.dddhexagonalspring.infrastracture.repository.mongo;
 
-import com.baeldung.dddhexagonalspring.domain.Order;
-import com.baeldung.dddhexagonalspring.domain.repository.OrderRepository;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.context.annotation.Primary;
-import org.springframework.stereotype.Component;
-
 import java.util.Optional;
 import java.util.UUID;
 
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import com.baeldung.dddhexagonalspring.domain.Order;
+import com.baeldung.dddhexagonalspring.domain.repository.OrderRepository;
+
 @Component
 public class MongoDbOrderRepository implements OrderRepository {
 
diff --git a/ddd/src/main/resources/ddd-layers.properties b/ddd/src/main/resources/ddd-layers.properties
index d0ad343b66..412c24eef7 100644
--- a/ddd/src/main/resources/ddd-layers.properties
+++ b/ddd/src/main/resources/ddd-layers.properties
@@ -1,3 +1,4 @@
+spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration
 spring.data.mongodb.host=localhost
 spring.data.mongodb.port=27017
 spring.data.mongodb.database=order-database
diff --git a/ddd/src/test/resources/com/baeldung/dddhexagonalspring/README.md b/ddd/src/test/resources/com/baeldung/dddhexagonalspring/README.md
index e0337498fc..1355514a3d 100644
--- a/ddd/src/test/resources/com/baeldung/dddhexagonalspring/README.md
+++ b/ddd/src/test/resources/com/baeldung/dddhexagonalspring/README.md
@@ -4,4 +4,6 @@ To run this project, follow these steps:
 
 * Run the application database by executing `docker-compose up` in this directory.
 * Launch the Spring Boot Application (DomainLayerApplication). 
-* By default, application will connect to this database (configuration in *ddd-layers.properties*)
\ No newline at end of file
+* By default, the application will connect to the one of the two databases (configuration in *ddd-layers.properties*)
+     * check `CassandraDbOrderRepository.java` and `MongoDbOrderRepository.java` 
+     * switch between the databases by making one of the above beans primary using the `@Primary` annotation  
\ No newline at end of file