Initial backend

backend/src/main/java/achievements/Application.java

@@ -0,0 +1,19 @@
+package achievements;
+
+import achievements.services.DbConnectionService;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+
+	public static void main(String[] args) {
+		var context = SpringApplication.run(Application.class, args);
+
+		// Verify the database connection succeeded
+		var db = context.getBean(DbConnectionService.class);
+		if (db.getConnection() == null) {
+			SpringApplication.exit(context, () -> 0);
+		}
+	}
+}