diff --git a/build.gradle b/build.gradle
index 2859a5e..9954268 100644
--- a/build.gradle
+++ b/build.gradle
@@ -6,7 +6,7 @@ plugins {
 
 java {
     group = 'eu.openaire.urls_controller'
-    version = '2.1.0-SNAPSHOT'
+    version = '2.4.0-SNAPSHOT'
     sourceCompatibility = JavaVersion.VERSION_1_8
 }
 
diff --git a/src/main/java/eu/openaire/urls_controller/services/UrlsServiceImpl.java b/src/main/java/eu/openaire/urls_controller/services/UrlsServiceImpl.java
index 4508fde..981b862 100644
--- a/src/main/java/eu/openaire/urls_controller/services/UrlsServiceImpl.java
+++ b/src/main/java/eu/openaire/urls_controller/services/UrlsServiceImpl.java
@@ -12,7 +12,6 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
-import org.springframework.boot.web.client.RestTemplateBuilder;
 import org.springframework.dao.EmptyResultDataAccessException;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
@@ -29,7 +28,6 @@ import java.sql.Connection;
 import java.sql.PreparedStatement;
 import java.sql.SQLException;
 import java.sql.Timestamp;
-import java.time.Duration;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -270,7 +268,7 @@ public class UrlsServiceImpl implements UrlsService {
         if ( logger.isTraceEnabled() )
             logger.trace("numDuplicates in returned assignments_" + curAssignmentsBatchCounter + " = " + (assignmentsSize - distinctAssignmentsSize));
 
-        logger.info("Sending batch-assignments_" + curAssignmentsBatchCounter + " with " + distinctAssignmentsSize + " assignments to worker with ID: " + workerId + ".");
+        logger.info("Sending batch-assignments_" + curAssignmentsBatchCounter + ", with " + distinctAssignmentsSize + " assignments, to worker with ID: " + workerId + ".");
         return ResponseEntity.status(HttpStatus.OK).body(new AssignmentsResponse(curAssignmentsBatchCounter, distinctAssignments));
     }
 
diff --git a/src/main/java/eu/openaire/urls_controller/util/FileUtils.java b/src/main/java/eu/openaire/urls_controller/util/FileUtils.java
index 8dad09c..e15b094 100644
--- a/src/main/java/eu/openaire/urls_controller/util/FileUtils.java
+++ b/src/main/java/eu/openaire/urls_controller/util/FileUtils.java
@@ -207,8 +207,8 @@ public class FileUtils {
             workerIp = workerInfo.getWorkerIP();    // This won't be null.
 
         // Get the file-locations.
-        AtomicInteger numFullTextsFound = new AtomicInteger();
-        AtomicInteger numFilesFoundFromPreviousAssignmentsBatches = new AtomicInteger();
+        final AtomicInteger numFullTextsFound = new AtomicInteger();
+        final AtomicInteger numFilesFoundFromPreviousAssignmentsBatches = new AtomicInteger();
 
         SetMultimap<String, Payload> allFileNamesWithPayloads = Multimaps.synchronizedSetMultimap(HashMultimap.create((sizeOfUrlReports / 5), 3));    // Holds multiple values for any key, if a fileName(key) has many IDs(values) associated with it.
 
@@ -288,8 +288,7 @@ public class FileUtils {
             logger.warn("The current thread was interrupted when waiting for the worker-threads to finish checking for already-found file-hashes: " + ie.getMessage());
             // This is a very rare case. At the moment, we just move on with what we have so far.
         } catch (Exception e) {
-            String errorMsg = "Unexpected error when checking for already-found file-hashes in parallel! " + e.getMessage();
-            logger.error(errorMsg, e);
+            logger.error("Unexpected error when checking for already-found file-hashes in parallel!", e);
             return UploadFullTextsResponse.unsuccessful;
         } finally {
             DatabaseConnector.databaseLock.unlock();  // The remaining work of this function does not use the database.