actually set the prgram to the free port

server/src/main/java/server/ServerPortCustomizer.java

@@ -0,0 +1,29 @@
+
+package server;
+
+import org.springframework.boot.web.server.ConfigurableWebServerFactory;
+import org.springframework.boot.web.server.WebServerFactoryCustomizer;
+import org.springframework.stereotype.Component;
+
+@Component
+public class ServerPortCustomizer implements WebServerFactoryCustomizer<ConfigurableWebServerFactory>{
+    /**
+     * Changes the port that will be used to launch the program
+     * made with the help of: https://www.baeldung.com/spring-boot-change-port
+     * @param factory
+     */
+    @Override
+    public void customize(ConfigurableWebServerFactory factory) {
+        try {
+            PortChecker portChecker = new PortChecker();
+            int port = portChecker.findFreePort();
+            factory.setPort(port);
+            System.out.println("Server starts on port: " + port);
+        } catch (Exception e) {
+            throw new RuntimeException("Failed to find a free port", e);
+        }
+    }
+}
+
+
+