1- Tap "netstat -ao |find /i "listening" to Check what processes are running at available ports.
2- Tap "Taskkill /F /IM #Process_Id (eg:2564)" to stop in windows
3 - Return application
I must add the following dependency in pom.xml
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
</dependency>