[BAEL-18364] move spring-rest-*** articles - 1

spring-resttemplate/src/main/java/com/baeldung/changeport/CustomApplication.java

@@ -0,0 +1,17 @@
+package com.baeldung.changeport;
+
+import java.util.Collections;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class CustomApplication {
+
+    public static void main(String[] args) {
+        SpringApplication app = new SpringApplication(CustomApplication.class);
+        app.setDefaultProperties(Collections.singletonMap("server.port", "8083"));
+        app.run(args);
+    }
+
+}