diff --git a/.settings/org.eclipse.wst.common.component b/.settings/org.eclipse.wst.common.component
index 6caf699..671fd1c 100644
--- a/.settings/org.eclipse.wst.common.component
+++ b/.settings/org.eclipse.wst.common.component
@@ -3,6 +3,9 @@
         <wb-resource deploy-path="/" source-path="/target/m2e-wtp/web-resources"/>
         <wb-resource deploy-path="/" source-path="/src/main/webapp" tag="defaultRootSource"/>
         <wb-resource deploy-path="/WEB-INF/classes" source-path="/src/main/java"/>
+        <dependent-module archiveName="grsf-common-library-1.0.1-SNAPSHOT.jar" deploy-path="/WEB-INF/lib" handle="module:/resource/grsf-common-library/grsf-common-library">
+            <dependency-type>uses</dependency-type>
+        </dependent-module>
         <property name="context-root" value="grsf-publisher-ws"/>
         <property name="java-output-path" value="/grsf-publisher-ws/target/classes"/>
     </wb-module>
diff --git a/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/CommonServiceUtils.java b/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/CommonServiceUtils.java
index 1ebece5..87ecd79 100644
--- a/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/CommonServiceUtils.java
+++ b/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/CommonServiceUtils.java
@@ -10,6 +10,7 @@ import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
 
 import javax.servlet.ServletContext;
 
@@ -50,7 +51,7 @@ public class CommonServiceUtils {
 
 	private static final org.slf4j.Logger logger = LoggerFactory.getLogger(CommonServiceUtils.class);
 	private static final int TAG_MAX_SIZE = 100;
-	private static Map<String, Boolean> extensionsCheck = new HashMap<String, Boolean>();
+	private static Map<String, Boolean> extensionsCheck = new ConcurrentHashMap<>();
 
 	/**
 	 * Retrieve the list of licenses for stocks and fisheries