Spring Boot :: set random server port

Spring.Boot.Server.Random.Port.java

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.autoconfigure.web.ServerPropertiesAutoConfiguration;
import org.springframework.boot.context.embedded.ConfigurableEmbeddedServletContainer;
import org.springframework.context.annotation.Configuration;

import java.io.IOException;
import java.net.ServerSocket;

@Configuration
public class ServerPropertiesConfiguration extends ServerPropertiesAutoConfiguration {
	@SuppressWarnings("unused") private static final Logger LOG = LoggerFactory.getLogger(
		ServerPropertiesConfiguration.class.getName());

	@Override
	public void customize(ConfigurableEmbeddedServletContainer container) {
		container.setPort(findRandomOpenPortOnAllLocalInterfaces());
		super.customize(container);
	}

	private int findRandomOpenPortOnAllLocalInterfaces() {
		int port = 0;
		try (ServerSocket socket = new ServerSocket(port)) {
			port = socket.getLocalPort();
			socket.close();
		} catch (IOException ignored) {
		}
		LOG.debug("port: {}", port);
		return port;
	}

}