Add Simple Java client to check Actuator helath status

Author: Huulivoide

docker/HealhtCheck.jar

@@ -0,0 +1,27 @@
+import java.io.IOException;
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse.BodyHandlers;
+
+static void main(String[] args) throws IOException, InterruptedException {
+    final var client = HttpClient.newHttpClient();
+    final var request = HttpRequest.newBuilder()
+            .uri(URI.create("http://localhost:8080/actuator/health"))
+            .header("accept", "application/json")
+            .build();
+
+    final var response = client.send(request, BodyHandlers.ofString());
+    final var body = response.body();
+
+    System.out.print("Status: " + response.statusCode());
+    System.out.print(" | body: " + body);
+    System.out.println();
+
+    if (response.statusCode() != 200 || !body.contains("UP")) {
+        System.err.println("Service is not UP!");
+        System.exit(1);
+    } else {
+        System.exit(0);
+    }
+}