- Improve the stability of "UriBuilder.getPublicIP()", by using a "HttpURLConnection" to increase the connection and read timeouts and avoid timeout-exceptions.

- Show the number of assignments which are requested from the Controller, in the log-message.
- Update Spring.

build.gradle

@@ -1,5 +1,5 @@
 plugins {
-    id 'org.springframework.boot' version '2.7.6'
+    id 'org.springframework.boot' version '2.7.7'
     id 'io.spring.dependency-management' version '1.1.0'
     id 'java'
 }

src/main/java/eu/openaire/urls_worker/controllers/FullTextsController.java

@@ -39,7 +39,7 @@ public class FullTextsController {
     public Object getMultipleFullTexts(@PathVariable long assignmentsCounter, @PathVariable int totalZipBatches, @PathVariable int zipBatchCounter, @PathVariable List<String> fileNamesWithExtensions) {
 
         int fileNamesListNum = fileNamesWithExtensions.size();
-        if ( (fileNamesListNum == 1) && (fileNamesWithExtensions.get(0).length() == 0) ) {  // In case the last "/" in the url was given, then this list will not be empty, but have one empty item instead.
+        if ( (fileNamesListNum == 1) && (fileNamesWithExtensions.get(0).length() == 0) ) {  // In case the last "/" in the url was given (without any files following), then this list will not be empty, but have one empty item instead.
             // In case the url does not end in "/", then Spring will automatically return an "HTTP-BadRequest".
             String errorMsg = "An empty \"fileNamesWithExtensions\" list was given from assignments_" + assignmentsCounter + ", for batch_" + zipBatchCounter;
             logger.error(errorMsg);

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

@@ -67,7 +67,7 @@ public class AssignmentsHandler {
 
     public static AssignmentsRequest requestAssignments()
     {
-        logger.info("Going to request assignments from the controller-server: " + requestUrl);
+        logger.info("Going to request " + UrlsWorkerApplication.maxAssignmentsLimitPerBatch + " assignments from the controller-server: " + requestUrl);
 
         AssignmentsRequest assignmentRequest = null;
         try {   // Here, the HTTP-request is executed.

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

@@ -8,8 +8,8 @@ import org.springframework.core.env.Environment;
 
 import java.io.BufferedReader;
 import java.io.InputStreamReader;
+import java.net.HttpURLConnection;
 import java.net.InetAddress;
-import java.net.MalformedURLException;
 import java.net.URL;
 
 public class UriBuilder {
@@ -55,19 +55,24 @@ public class UriBuilder {
     private static String getPublicIP()
     {
         String publicIpAddress = "";
-        URL url_name;
+        HttpURLConnection conn = null;
         try {
-            url_name = new URL("https://api.ipify.org/");
+            conn = (HttpURLConnection) new URL("https://api.ipify.org/").openConnection();
-        } catch (MalformedURLException mue) {
+            conn.setConnectTimeout(60_000);
-            logger.warn(mue.getMessage());
+            conn.setReadTimeout(60_000);
-            return null;
+            conn.setRequestMethod("GET");
-        }
+            conn.connect();
-        try ( BufferedReader bf = new BufferedReader(new InputStreamReader(url_name.openStream()))) {
+            try ( BufferedReader bf = new BufferedReader(new InputStreamReader(conn.getInputStream()))) {
-            publicIpAddress = bf.readLine().trim();
+                publicIpAddress = bf.readLine().trim();
+            }
         } catch (Exception e) {
             logger.warn("Cannot get the publicIP address for this machine!", e);
             return null;
+        } finally {
+            if ( conn != null )
+                conn.disconnect();
         }
+
         return publicIpAddress;
     }