diff --git a/src/main/java/org/gcube/gcat/GCatInitializator.java b/src/main/java/org/gcube/gcat/GCatInitializator.java
index 6766d42..0d5e789 100644
--- a/src/main/java/org/gcube/gcat/GCatInitializator.java
+++ b/src/main/java/org/gcube/gcat/GCatInitializator.java
@@ -34,7 +34,7 @@ public class GCatInitializator implements ApplicationManager {
 	 * Furthermore create/connect to DB
 	 */
 	@Override
-	public void onInit() {
+	public synchronized void onInit() {
 		RequestFilter requestFilter = new RequestFilter();
 		try {
 			requestFilter.filter(null);
@@ -88,7 +88,7 @@ public class GCatInitializator implements ApplicationManager {
 	 * Furthermore close the connection to DB.
 	 */
 	@Override
-	public void onShutdown(){
+	public synchronized void onShutdown(){
 		RequestFilter requestFilter = new RequestFilter();
 		try {
 			requestFilter.filter(null);