- Improve startup speed, by using a faster remote server to get the host's machine public IP. This also reduces the risk of not being able to get the public IP at all.

- Set the App to gracefully shut down the WebServer and wait up to 2 minutes.
- Increase the waiting time for the "PublicationsRetriever.executor" to shut down, to 2 minutes.

src/main/java/eu/openaire/urls_worker/UrlsWorkerApplication.java

@@ -76,7 +76,7 @@ public class UrlsWorkerApplication {
             logger.info("Shutting down the threads used by \"PublicationsRetriever\"-plugin..");
             PublicationsRetriever.executor.shutdown();	// Define that no new tasks will be scheduled.
             try {
-                if ( !PublicationsRetriever.executor.awaitTermination(1, TimeUnit.MINUTES) ) {
+                if ( !PublicationsRetriever.executor.awaitTermination(2, TimeUnit.MINUTES) ) {
                     logger.warn("The working threads did not finish on time! Stopping them immediately..");
                     PublicationsRetriever.executor.shutdownNow();
                 }

src/main/java/eu/openaire/urls_worker/util/UriBuilder.java

@@ -55,7 +55,7 @@ public class UriBuilder {
     {
         String publicIpAddress = "";
         HttpURLConnection conn = null;
-        String urlString = "https://api.ipify.org/";
+        String urlString = "https://checkip.amazonaws.com/";
         try {
             conn = (HttpURLConnection) new URL(urlString).openConnection();
             conn.setConnectTimeout(60_000); // 1 minute

src/main/resources/application.properties

@@ -15,6 +15,9 @@ server.port = 1881
 
 # Server api path
 server.servlet.context-path=/api
+server.shutdown=graceful
+
+spring.lifecycle.timeout-per-shutdown-phase=2m
 
 #Input data configurations
 info.workerId = XX