diff --git a/concessioni-lifecycle/src/main/java/org/gcube/application/cms/concessioni/plugins/ConcessioniLifeCycleManager.java b/concessioni-lifecycle/src/main/java/org/gcube/application/cms/concessioni/plugins/ConcessioniLifeCycleManager.java
index 0944db8..37aec02 100644
--- a/concessioni-lifecycle/src/main/java/org/gcube/application/cms/concessioni/plugins/ConcessioniLifeCycleManager.java
+++ b/concessioni-lifecycle/src/main/java/org/gcube/application/cms/concessioni/plugins/ConcessioniLifeCycleManager.java
@@ -48,7 +48,7 @@ public class ConcessioniLifeCycleManager implements LifecycleManager {
     PluginManagerInterface pluginManager;
 
     // TODO DISCOVER
-    MaterializationPlugin plugin = new SDIMaterializerPlugin();
+    MaterializationPlugin plugin;
 
     @Override
     public InitializationReport initInContext() throws InitializationException {
@@ -109,7 +109,7 @@ public class ConcessioniLifeCycleManager implements LifecycleManager {
 
 
                         matReq.setParameters(params);
-                        MaterializationReport matRep = new SDIMaterializerPlugin().materialize(matReq);
+                        MaterializationReport matRep = plugin.materialize(matReq);
 
 
                         switch(matRep.getStatus()){
diff --git a/concessioni-lifecycle/src/main/java/org/gcube/application/cms/concessioni/plugins/SDIMaterializerPlugin.java b/concessioni-lifecycle/src/main/java/org/gcube/application/cms/concessioni/plugins/SDIMaterializerPlugin.java
index 99a3a3d..6944deb 100644
--- a/concessioni-lifecycle/src/main/java/org/gcube/application/cms/concessioni/plugins/SDIMaterializerPlugin.java
+++ b/concessioni-lifecycle/src/main/java/org/gcube/application/cms/concessioni/plugins/SDIMaterializerPlugin.java
@@ -133,11 +133,11 @@ public class SDIMaterializerPlugin implements MaterializationPlugin {
 
                     RegisteredFileSet obtained = getSDIManager().materializeLayer(fs,requestArguments);
                     log.debug("Obtained {} ",obtained);
-                    documentNavigator.setElement("$..[?(@.uuid == "+fs.getUUID()+")]",obtained);
+                    documentNavigator.setElement("$..[?(@.uuid == '"+fs.getUUID()+"')]",obtained);
                 }
             }
 
-            profiledDocument.setTheDocument(Document.parse(documentNavigator.getValueCTX().json()));
+            profiledDocument.setTheDocument(Document.parse(documentNavigator.getValueCTX().jsonString()));
             report.setResultDocument(profiledDocument);
             report.setStatus(Report.Status.OK);
         }catch (SDIInteractionException e){
diff --git a/concessioni-lifecycle/src/main/java/org/gcube/application/cms/concessioni/sdi/SDIManager.java b/concessioni-lifecycle/src/main/java/org/gcube/application/cms/concessioni/sdi/SDIManager.java
index 67715ea..375578b 100644
--- a/concessioni-lifecycle/src/main/java/org/gcube/application/cms/concessioni/sdi/SDIManager.java
+++ b/concessioni-lifecycle/src/main/java/org/gcube/application/cms/concessioni/sdi/SDIManager.java
@@ -8,6 +8,7 @@ import lombok.Getter;
 import lombok.extern.slf4j.Slf4j;
 import org.bson.Document;
 import org.gcube.application.cms.concessioni.sdi.faults.SDIInteractionException;
+import org.gcube.application.cms.plugins.requests.BaseExecutionRequest;
 import org.gcube.application.cms.serialization.Serialization;
 import org.gcube.application.geoportal.common.model.document.filesets.GCubeSDILayer;
 
@@ -92,9 +93,9 @@ public class SDIManager {
 			log.debug("Materializing FS {} on {} ", fileSet, geoserverHostName);
 
 			// validate parameters
-			String workspace = getMandatory("workspace", params);
-			String documentID = getMandatory("documentID", params);
-			String basePersistencePAth = getMandatory("basePersistencePath", params);
+			String workspace = BaseExecutionRequest.getMandatory("workspace", params);
+			String documentID = BaseExecutionRequest.getMandatory("documentID", params);
+			String basePersistencePAth = BaseExecutionRequest.getMandatory("basePersistencePath", params);
 
 
 			// check if empty
@@ -276,9 +277,6 @@ public class SDIManager {
 	}
 
 
-	private static final String getMandatory(String param,Document params) throws SDIInteractionException {
-		if(!params.containsKey(param)) throw new SDIInteractionException("Missing mandatory parameter "+param);
-		return params.getString(param);
-	}
+
 
 }