Added simple CascadeSave email for User

spring-data-mongodb/src/main/java/org/baeldung/config/MongoConfig.java

@@ -5,6 +5,7 @@ import java.util.List;
 
 import org.baeldung.converter.UserWriterConverter;
 import org.baeldung.event.CascadeSaveMongoEventListener;
+import org.baeldung.event.UserCascadeSaveMongoEventListener;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.data.mongodb.config.AbstractMongoConfiguration;
@@ -36,6 +37,11 @@ public class MongoConfig extends AbstractMongoConfiguration {
         return "org.baeldung";
     }
 
+    @Bean
+    public UserCascadeSaveMongoEventListener userCascadingMongoEventListener() {
+        return new UserCascadeSaveMongoEventListener();
+    }
+
     @Bean
     public CascadeSaveMongoEventListener cascadingMongoEventListener() {
         return new CascadeSaveMongoEventListener();