Actuator Health Check for Docker Compose

ActuatorHealth.java

import java.io.IOException;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse.BodyHandlers;

public class ActuatorHealth {
    public static void main(String[] args) throws InterruptedException, IOException {
        String url = (args != null && args.length > 0) ? args[0].trim() : "http://localhost:8080/actuator/health/readiness";
        System.out.println("Health: " + url);
        var client = HttpClient.newHttpClient();
        var request = HttpRequest.newBuilder()
            .uri(URI.create(url))
            .header("accept", "application/json")
            .build();
        var response = client.send(request, BodyHandlers.ofString());
        if (response.statusCode() != 200 || !response.body().contains("UP")) {
            throw new RuntimeException("Healthcheck failed");
        }
    }
}