BAEL-2275: Fill the test. Rename package.

ddd/src/main/java/com/baeldung/dddhexagonalspring/DomainLayerApplication.java

@@ -0,0 +1,13 @@
+package com.baeldung.dddhexagonalspring;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.PropertySource;
+
+@SpringBootApplication
+@PropertySource(value = { "classpath:ddd-layers.properties" })
+public class DomainLayerApplication {
+    public static void main(final String[] args) {
+        SpringApplication.run(DomainLayerApplication.class, args);
+    }
+}