diff --git a/src/main/java/org/gcube/datatransfer/resolver/services/AnalyticsCreateResolver.java b/src/main/java/org/gcube/datatransfer/resolver/services/AnalyticsCreateResolver.java
index 3b4caf5..17d0270 100644
--- a/src/main/java/org/gcube/datatransfer/resolver/services/AnalyticsCreateResolver.java
+++ b/src/main/java/org/gcube/datatransfer/resolver/services/AnalyticsCreateResolver.java
@@ -163,7 +163,7 @@ public class AnalyticsCreateResolver {
 
 			if(!(e instanceof WebApplicationException)){
 				//UNEXPECTED EXCEPTION managing it as WebApplicationException
-				String error = "Error occurred on creating the Analytics for the request "+body+". Please, contact the support!";
+				String error = "Error occurred on creating the Analytics for the request "+body+". Please, contact the support!"+"\nCause: "+e.getCause().getMessage();
 				throw ExceptionManager.internalErrorException(req, error, this.getClass(), helpURI);
 			}
 			//ALREADY MANAGED AS WebApplicationException
diff --git a/src/main/java/org/gcube/datatransfer/resolver/services/AnalyticsGetResolver.java b/src/main/java/org/gcube/datatransfer/resolver/services/AnalyticsGetResolver.java
index 74b2391..43a6de8 100644
--- a/src/main/java/org/gcube/datatransfer/resolver/services/AnalyticsGetResolver.java
+++ b/src/main/java/org/gcube/datatransfer/resolver/services/AnalyticsGetResolver.java
@@ -88,7 +88,7 @@ public class AnalyticsGetResolver {
 
 			if(!(e instanceof WebApplicationException)){
 				//UNEXPECTED EXCEPTION managing it as WebApplicationException
-				String error = "Error occurred on resolving the Analytics URL. Please, contact the support!";
+				String error = "Error occurred on resolving the Analytics URL. Please, contact the support!"+"\nCause: "+e.getCause().getMessage();
 				throw ExceptionManager.internalErrorException(req, error, this.getClass(), helpURI);
 			}
 			//ALREADY MANAGED AS WebApplicationException
diff --git a/src/main/java/org/gcube/datatransfer/resolver/services/CatalogueResolver.java b/src/main/java/org/gcube/datatransfer/resolver/services/CatalogueResolver.java
index 354d0b7..bc900da 100644
--- a/src/main/java/org/gcube/datatransfer/resolver/services/CatalogueResolver.java
+++ b/src/main/java/org/gcube/datatransfer/resolver/services/CatalogueResolver.java
@@ -10,6 +10,7 @@ import javax.ws.rs.POST;
 import javax.ws.rs.Path;
 import javax.ws.rs.PathParam;
 import javax.ws.rs.Produces;
+import javax.ws.rs.WebApplicationException;
 import javax.ws.rs.core.Context;
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
@@ -53,10 +54,15 @@ public class CatalogueResolver {
 	 */
 	@GET
 	@Path("{entityContext:ctlg(-(o|g|p|d))?}/{vreName}/{entityName}")
-	public Response resolveCatalogue(@Context HttpServletRequest req, @PathParam("entityName") String entityName, @PathParam("vreName") String vreName, @PathParam("entityContext") String entityContext) {
-		InnerMethodName.instance.set("resolveCataloguePublicLink");
-		logger.info(CatalogueResolver.class.getSimpleName()+" GET starts...");
+	public Response resolveCatalogue(@Context HttpServletRequest req,
+		@PathParam("entityName") String entityName,
+		@PathParam("vreName") String vreName,
+		@PathParam("entityContext") String entityContext) throws WebApplicationException{
+
+		logger.info(this.getClass().getSimpleName()+" GET starts...");
+
 		try {
+			InnerMethodName.instance.set("resolveCataloguePublicLink");
 			ItemCatalogueURLs itemCatalogueURLs = getItemCatalogueURLs(vreName, entityContext, entityName);
 
 			String itemCatalogueURL;
@@ -71,9 +77,15 @@ public class CatalogueResolver {
 
 			return Response.seeOther(new URL(itemCatalogueURL).toURI()).build();
 		}catch (Exception e) {
-			logger.error("error resolving catalogue link",e);
-			ExceptionManager.internalErrorException(req, "Error occurred resolving catalogue link", this.getClass(), helpURI);
-			return null;
+
+			if(!(e instanceof WebApplicationException)){
+				//UNEXPECTED EXCEPTION managing it as WebApplicationException
+				String error = "Error occurred on resolving the Catalgoue URL. Please, contact the support!"+"\nCause: "+e.getCause().getMessage();
+				throw ExceptionManager.internalErrorException(req, error, this.getClass(), helpURI);
+			}
+			//ALREADY MANAGED AS WebApplicationException
+			logger.error("Exception:", e);
+			throw (WebApplicationException) e;
 		}
 	}
 
@@ -88,44 +100,57 @@ public class CatalogueResolver {
 	@Path("catalogue")
 	@Consumes(MediaType.APPLICATION_JSON)
 	@Produces(MediaType.TEXT_PLAIN)
-	public Response postCatalogue(@Context HttpServletRequest req, CatalogueRequest jsonRequest) {
-		InnerMethodName.instance.set("postCataloguePublicLink");
-		logger.info(CatalogueResolver.class.getSimpleName()+" POST starts...");
-		logger.info("The body contains the request: "+jsonRequest.toString());
-		//final CatalogueEntityRequest cer = new CatalogueEntityRequest();
+	public Response postCatalogue(@Context HttpServletRequest req, CatalogueRequest jsonRequest) throws WebApplicationException{
+		logger.info(this.getClass().getSimpleName()+" POST starts...");
 
-		//CHECK IF INPUT SCOPE IS VALID
-		String scope = jsonRequest.getGcube_scope();
-		if(!scope.startsWith("/")){
-			logger.info("Scope not start with char '/' adding it");
-			scope+="/"+scope;
+		try{
+
+			InnerMethodName.instance.set("postCataloguePublicLink");
+			logger.info("The body contains the request: "+jsonRequest.toString());
+
+			//CHECK IF INPUT SCOPE IS VALID
+			String scope = jsonRequest.getGcube_scope();
+			if(!scope.startsWith("/")){
+				logger.info("Scope not start with char '/' adding it");
+				scope+="/"+scope;
+			}
+
+			String serverUrl = Util.getServerURL(req);
+
+			final String vreName = scope.substring(scope.lastIndexOf("/")+1, scope.length());
+			String fullScope = null;
+			//CHECK IF THE vreName has a valid scope, so it is a valid VRE
+			try {
+				fullScope = LoadingVREsScopeCache.getCache().get(vreName);
+			}
+			catch (ExecutionException e1) {
+				logger.error("Error on getting full scope for vre name: "+vreName, e1);
+			}
+
+			if(fullScope==null)
+				throw ExceptionManager.notFoundException(req, "The scope '"+scope+"' does not matching any scope in the infrastructure. Is it valid?", this.getClass(), helpURI);
+
+			ResourceCatalogueCodes rc = ResourceCatalogueCodes.valueOfCodeValue(jsonRequest.getEntity_context());
+			if(rc==null){
+				logger.error("Entity context is null/malformed");
+				throw ExceptionManager.badRequestException(req, "Entity context is null/malformed", this.getClass(), helpURI);
+			}
+
+			String linkURL = String.format("%s/%s/%s/%s", serverUrl, rc.getId(), vreName, jsonRequest.getEntity_name());
+			logger.info("Returining Catalogue URL: "+linkURL);
+			return Response.ok(linkURL).header("Location", linkURL).build();
+
+		}catch (Exception e) {
+
+			if(!(e instanceof WebApplicationException)){
+				//UNEXPECTED EXCEPTION managing it as WebApplicationException
+				String error = "Error occurred on resolving the Analytics URL. Please, contact the support!";
+				throw ExceptionManager.internalErrorException(req, error, this.getClass(), helpURI);
+			}
+			//ALREADY MANAGED AS WebApplicationException
+			logger.error("Exception:", e);
+			throw (WebApplicationException) e;
 		}
-
-		String serverUrl = Util.getServerURL(req);
-
-		final String vreName = scope.substring(scope.lastIndexOf("/")+1, scope.length());
-		String fullScope = null;
-		//CHECK IF THE vreName has a valid scope, so it is a valid VRE
-		try {
-			fullScope = LoadingVREsScopeCache.getCache().get(vreName);
-		}
-		catch (ExecutionException e1) {
-			logger.error("Error on getting full scope for vre name: "+vreName, e1);
-		}
-
-		if(fullScope==null)
-			ExceptionManager.notFoundException(req, "The scope '"+scope+"' does not matching any scope in the infrastructure. Is it valid?", this.getClass(), helpURI);
-
-		ResourceCatalogueCodes rc = ResourceCatalogueCodes.valueOfCodeValue(jsonRequest.getEntity_context());
-		if(rc==null){
-			logger.error("Entity context is null/malformed");
-			ExceptionManager.badRequestException(req, "Entity context is null/malformed", this.getClass(), helpURI);
-			//throw new WebApplicationException("Entity context is null/malformed", Status.BAD_REQUEST);
-		}
-
-		String linkURL = String.format("%s/%s/%s/%s", serverUrl, rc.getId(), vreName, jsonRequest.getEntity_name());
-		logger.info("Returining Catalogue URL: "+linkURL);
-		return Response.ok(linkURL).header("Location", linkURL).build();
 	}
 
 
@@ -172,7 +197,7 @@ public class CatalogueResolver {
 			String privatePortletURL = String.format("%s?path=/%s/%s",ckanCatalogueReference.getPrivatePortletURL(),entityContextValue, entityName);
 			return new ItemCatalogueURLs(entityName, isPublicItem, privatePortletURL, publicPorltetURL);
 		}catch (Exception e) {
-			logger.error("error resolving catalogue link",e);
+			logger.error("Error when resolving CatalogueURL:", e);
 			throw e;
 		}
 
diff --git a/src/main/java/org/gcube/datatransfer/resolver/services/GeonetworkResolver.java b/src/main/java/org/gcube/datatransfer/resolver/services/GeonetworkResolver.java
index aa9a78e..b00b372 100644
--- a/src/main/java/org/gcube/datatransfer/resolver/services/GeonetworkResolver.java
+++ b/src/main/java/org/gcube/datatransfer/resolver/services/GeonetworkResolver.java
@@ -3,8 +3,6 @@ package org.gcube.datatransfer.resolver.services;
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.InputStream;
-import java.net.URI;
-import java.net.URISyntaxException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
@@ -19,6 +17,7 @@ import javax.ws.rs.POST;
 import javax.ws.rs.Path;
 import javax.ws.rs.PathParam;
 import javax.ws.rs.QueryParam;
+import javax.ws.rs.WebApplicationException;
 import javax.ws.rs.core.Context;
 import javax.ws.rs.core.Response;
 import javax.ws.rs.core.Response.ResponseBuilder;
@@ -37,7 +36,6 @@ import org.gcube.datatransfer.resolver.gis.geonetwork.GeonetworkRequestFilterPar
 import org.gcube.datatransfer.resolver.gis.geonetwork.GeonetworkRequestFilterParameters.VISIBILITY;
 import org.gcube.datatransfer.resolver.gis.geonetwork.ReusableInputStream;
 import org.gcube.datatransfer.resolver.services.error.ExceptionManager;
-import org.gcube.datatransfer.resolver.services.exceptions.InternalServerException;
 import org.gcube.datatransfer.resolver.util.GetResponseRecordFilter;
 import org.gcube.datatransfer.resolver.util.HTTPCallsUtils;
 import org.gcube.datatransfer.resolver.util.HTTPCallsUtils.HttpResponse;
@@ -89,7 +87,7 @@ public class GeonetworkResolver {
 
 	protected Map<String, GeonetworkInstance> cacheGNInstances;
 
-	private String help = "https://wiki.gcube-system.org/gcube/GCube_Resource_Catalogue#Geonetwork_Resolver";
+	private String helpURI = "https://wiki.gcube-system.org/gcube/GCube_Resource_Catalogue#Geonetwork_Resolver";
 
 	/**
 	 * Gets the geonetwork request criteria.
@@ -122,107 +120,110 @@ public class GeonetworkResolver {
 		@PathParam("filterValue") @Nullable String filterValue,
 		@PathParam(PATH_PARAM_REMAINPATH) @Nullable String remainPath,
 		@QueryParam(QUERY_PARAM_RESET_CACHE_PARAM) @Nullable String resetCache,
-		@QueryParam(QUERY_PARAM_RESET_CACHED_SCOPE_PARAM) @Nullable String resetScope) {
+		@QueryParam(QUERY_PARAM_RESET_CACHED_SCOPE_PARAM) @Nullable String resetScope) throws WebApplicationException{
 
 		logger.info(this.getClass().getSimpleName()+" GET starts...");
-		logger.info("Params are [mode: "+mode+", scope: "+scope+", visibility: "+visibility+", filterKey: "+filterKey+", filterValue: "+filterValue+", remainPath: "+remainPath+"]");
-
-		if(scope==null || scope.isEmpty()){
-			logger.error("Path Parameter 'scope' not found");
-			ExceptionManager.badRequestException(req, "Missing mandatory path parameter 'scope'", this.getClass(), help);
-		}
-
-		if(mode==null || mode.isEmpty()){
-			logger.error("Path Parameter 'scope' not found");
-			ExceptionManager.badRequestException(req, "Missing mandatory path parameter 'mode'", this.getClass(), help);
-		}
-
-		scope = ScopeUtil.normalizeScope(scope, "|");
-		mode = mode.toUpperCase();
-		try{
-			MODE.valueOf(mode);
-		}catch(Exception e){
-			List<MODE> toPrint = Arrays.asList(MODE.values());
-			logger.error("The 'mode' parameter is wrong, Have you pass a valid parameter MODE like "+toPrint+"?");
-			ExceptionManager.wrongParameterException(req, "The 'mode' parameter must be value of "+toPrint, this.getClass(), help);
-		}
-
-		if(visibility==null){
-			logger.error("Path Parameter 'visibility' not found");
-			ExceptionManager.badRequestException(req, "Missing mandatory path parameter 'visibility'", this.getClass(), help);
-		}
-
-		visibility = visibility.toUpperCase();
-		try{
-			VISIBILITY.valueOf(visibility);
-		}catch (Exception e) {
-			List<VISIBILITY> toPrint = Arrays.asList(VISIBILITY.values());
-			logger.error("The 'visibility' parameter is wrong, Have you pass a valid parameter VISIBILITY like "+toPrint+"?");
-			ExceptionManager.wrongParameterException(req, "The 'visibility' parameter must be value of "+toPrint, this.getClass(), help);
-		}
-
-		if(resetCache!=null && Boolean.parseBoolean(resetCache)){
-			purgeCacheGeonetworkInstances();
-		}
-
-		if(resetScope!=null && Boolean.parseBoolean(resetScope)){
-			resetGeonetoworkInstanceCacheForScope(scope);
-		}
-
-		logger.info("Remaining path is: "+remainPath);
 		String gnGetlURL = null;
+
 		try {
+			logger.info("Params are [mode: "+mode+", scope: "+scope+", visibility: "+visibility+", filterKey: "+filterKey+", filterValue: "+filterValue+", remainPath: "+remainPath+"]");
 
-			GeonetworkInstance gnInstance = getGeonetworkInstanceForScope(scope);
-
-			ScopeProvider.instance.set(scope);
-
-			HTTPCallsUtils httpUtils = new HTTPCallsUtils();
-			Configuration config = gnInstance.getGeonetworkPublisher().getConfiguration();
-			String geonetworkUrl = config.getGeoNetworkEndpoint();
-			String baseURL = remainPath==null ||remainPath.isEmpty()?geonetworkUrl+"/"+CSW_SERVER:geonetworkUrl+"/"+CSW_SERVER+remainPath;
-			logger.info("The base URL is: "+baseURL);
-			String queryString = req.getQueryString()==null || req.getQueryString().isEmpty()?"":"?"+req.getQueryString();
-			gnGetlURL = baseURL+queryString;
-			logger.info("Sending get request to URL: "+gnGetlURL);
-			HttpResponse proxedGNResponse = httpUtils.get(gnGetlURL);
-
-			switch(proxedGNResponse.getStatus()){
-			case HttpServletResponse.SC_OK:
-
-				//Building the response
-				InputStream streamToWrite = IOUtils.toInputStream(proxedGNResponse.getResponse());
-				StreamingOutput so = new SingleFileStreamingOutput(streamToWrite);
-
-				logger.info("Response return Content-Type: "+httpUtils.getLastContentType());
-
-				ResponseBuilder responseBuilder = Response
-				.ok(so)
-				.header(ConstantsResolver.CONTENT_TYPE, httpUtils.getLastContentType());
-				return responseBuilder.build();
-
-			case HttpServletResponse.SC_FORBIDDEN:
-				ExceptionManager.forbiddenException(req, "You are not authorized to perform the request "+gnGetlURL, this.getClass(), help);
-				break;
-
-			default:
-				ExceptionManager.internalErrorException(req, "Sorry, an error occurred performing the geonetwork request "+gnGetlURL+" with scope "+scope, this.getClass(), help);
+			if(scope==null || scope.isEmpty()){
+				logger.error("Path Parameter 'scope' not found");
+				throw ExceptionManager.badRequestException(req, "Missing mandatory path parameter 'scope'", this.getClass(), helpURI);
 			}
 
-		} catch (Exception e) {
+			if(mode==null || mode.isEmpty()){
+				logger.error("Path Parameter 'scope' not found");
+				throw ExceptionManager.badRequestException(req, "Missing mandatory path parameter 'mode'", this.getClass(), helpURI);
+			}
+
+			scope = ScopeUtil.normalizeScope(scope, "|");
+			mode = mode.toUpperCase();
+			try{
+				MODE.valueOf(mode);
+			}catch(Exception e){
+				List<MODE> toPrint = Arrays.asList(MODE.values());
+				logger.error("The 'mode' parameter is wrong, Have you pass a valid parameter MODE like "+toPrint+"?");
+				throw ExceptionManager.wrongParameterException(req, "The 'mode' parameter must be value of "+toPrint, this.getClass(), helpURI);
+			}
+
+			if(visibility==null){
+				logger.error("Path Parameter 'visibility' not found");
+				throw ExceptionManager.badRequestException(req, "Missing mandatory path parameter 'visibility'", this.getClass(), helpURI);
+			}
+
+			visibility = visibility.toUpperCase();
+			try{
+				VISIBILITY.valueOf(visibility);
+			}catch (Exception e) {
+				List<VISIBILITY> toPrint = Arrays.asList(VISIBILITY.values());
+				logger.error("The 'visibility' parameter is wrong, Have you pass a valid parameter VISIBILITY like "+toPrint+"?");
+				throw ExceptionManager.wrongParameterException(req, "The 'visibility' parameter must be value of "+toPrint, this.getClass(), helpURI);
+			}
+
+			if(resetCache!=null && Boolean.parseBoolean(resetCache)){
+				purgeCacheGeonetworkInstances();
+			}
+
+			if(resetScope!=null && Boolean.parseBoolean(resetScope)){
+				resetGeonetoworkInstanceCacheForScope(scope);
+			}
+
+			logger.info("Remaining path is: "+remainPath);
+			try {
+
+				GeonetworkInstance gnInstance = getGeonetworkInstanceForScope(scope);
+
+				ScopeProvider.instance.set(scope);
+
+				HTTPCallsUtils httpUtils = new HTTPCallsUtils();
+				Configuration config = gnInstance.getGeonetworkPublisher().getConfiguration();
+				String geonetworkUrl = config.getGeoNetworkEndpoint();
+				String baseURL = remainPath==null ||remainPath.isEmpty()?geonetworkUrl+"/"+CSW_SERVER:geonetworkUrl+"/"+CSW_SERVER+remainPath;
+				logger.info("The base URL is: "+baseURL);
+				String queryString = req.getQueryString()==null || req.getQueryString().isEmpty()?"":"?"+req.getQueryString();
+				gnGetlURL = baseURL+queryString;
+				logger.info("Sending get request to URL: "+gnGetlURL);
+				HttpResponse proxedGNResponse = httpUtils.get(gnGetlURL);
+
+				switch(proxedGNResponse.getStatus()){
+				case HttpServletResponse.SC_OK:
+
+					//Building the response
+					InputStream streamToWrite = IOUtils.toInputStream(proxedGNResponse.getResponse());
+					StreamingOutput so = new SingleFileStreamingOutput(streamToWrite);
+
+					logger.info("Response return Content-Type: "+httpUtils.getLastContentType());
+
+					ResponseBuilder responseBuilder = Response
+					.ok(so)
+					.header(ConstantsResolver.CONTENT_TYPE, httpUtils.getLastContentType());
+					return responseBuilder.build();
+
+				case HttpServletResponse.SC_FORBIDDEN:
+					throw ExceptionManager.forbiddenException(req, "You are not authorized to perform the request "+gnGetlURL, this.getClass(), helpURI);
+
+				default:
+					throw ExceptionManager.internalErrorException(req, "Sorry, an error occurred performing the geonetwork request "+gnGetlURL+" with scope "+scope, this.getClass(), helpURI);
+				}
+
+			} catch (Exception e) {
+				logger.error("Exception:", e);
+				String error = "Sorry, an error occurred on resolving geonetwork request with scope "+scope+". Please, contact support!";
+				throw ExceptionManager.internalErrorException(req, error, this.getClass(), helpURI);
+			}
+
+		}catch (Exception e) {
+
+			if(!(e instanceof WebApplicationException)){
+				//UNEXPECTED EXCEPTION managing it as WebApplicationException
+				String error = "Error during perform GET operation to: "+gnGetlURL+". Please, contact the support!";
+				throw ExceptionManager.internalErrorException(req, error, this.getClass(), helpURI);
+			}
+			//ALREADY MANAGED AS WebApplicationException
 			logger.error("Exception:", e);
-			String error = "Sorry, an error occurred on resolving geonetwork request with scope "+scope+". Please, contact support!";
-			ExceptionManager.internalErrorException(req, error, this.getClass(), help);
-		}
-
-		//An error occurred
-		try {
-
-			throw new InternalServerException(req, javax.ws.rs.core.Response.Status.INTERNAL_SERVER_ERROR, "Error during perform GET operation to: "+gnGetlURL, this.getClass(), new URI(help));
-		}
-		catch (URISyntaxException e) {
-			//silent
-			return null;
+			throw (WebApplicationException) e;
 		}
 
 	}
@@ -237,233 +238,238 @@ public class GeonetworkResolver {
 		@PathParam("filterValue") @Nullable String filterValue,
 		@PathParam(PATH_PARAM_REMAINPATH) @Nullable String remainPath,
 		@QueryParam(QUERY_PARAM_RESET_CACHE_PARAM) @Nullable String resetCache,
-		@QueryParam(QUERY_PARAM_RESET_CACHED_SCOPE_PARAM) @Nullable String resetScope) {
+		@QueryParam(QUERY_PARAM_RESET_CACHED_SCOPE_PARAM) @Nullable String resetScope) throws WebApplicationException{
 
 		logger.info(this.getClass().getSimpleName()+" POST starts...");
-		logger.info("Params are [mode: "+mode+", scope: "+scope+", visibility: "+visibility+", filterKey: "+filterKey+", filterValue: "+filterValue+", remainPath: "+remainPath+"]");
-
-		if(scope==null || scope.isEmpty()){
-			logger.error("Path Parameter 'scope' not found");
-			ExceptionManager.badRequestException(req, "Missing mandatory path parameter 'scope'", this.getClass(), help);
-		}
-
-		if(mode==null || mode.isEmpty()){
-			logger.error("Path Parameter 'scope' not found");
-			ExceptionManager.badRequestException(req, "Missing mandatory path parameter 'mode'", this.getClass(), help);
-		}
-
-		scope = ScopeUtil.normalizeScope(scope, "|");
-		mode = mode.toUpperCase();
-		try{
-			MODE.valueOf(mode);
-		}catch(Exception e){
-			List<MODE> toPrint = Arrays.asList(MODE.values());
-			logger.error("The 'mode' parameter is wrong, Have you pass a valid parameter MODE like "+toPrint+"?");
-			ExceptionManager.wrongParameterException(req, "The 'mode' parameter must be value of "+toPrint, this.getClass(), help);
-		}
-
-		if(visibility==null){
-			logger.error("Path Parameter 'visibility' not found");
-			ExceptionManager.badRequestException(req, "Missing mandatory path parameter 'visibility'", this.getClass(), help);
-		}
-
-		visibility = visibility.toUpperCase();
-		try{
-			VISIBILITY.valueOf(visibility);
-		}catch (Exception e) {
-			List<VISIBILITY> toPrint = Arrays.asList(VISIBILITY.values());
-			logger.error("The 'visibility' parameter is wrong, Have you pass a valid parameter VISIBILITY like "+toPrint+"?");
-			ExceptionManager.wrongParameterException(req, "The 'visibility' parameter must be value of "+toPrint, this.getClass(), help);
-		}
-
-		//HOW TO PASS ANY FILTER?
-		//TODO INVESTIGATE ON HOW TO PASS MORE THAN ONE FILTER...
-		Map<String,String> filters = new HashMap<String, String>();
-		if(filterKey!=null && filterValue!=null){
-			//IGNORING THE EMPTY FILTER 'null|null'
-			if(filterKey.compareToIgnoreCase("null")!=0){
-				filters.put(filterKey, filterValue);
-				logger.debug("Added filter parmas to map filters: "+filters);
-			}
-		}
-
 		String gnCSWlURL = null;
-		try {
 
-			GeonetworkServiceInterface gntwAccess = new GeonetworkAccessParameter(scope);
-			GeonetworkInstance gnInstance = gntwAccess.getGeonetworkInstance();
+		try{
+			logger.info("Params are [mode: "+mode+", scope: "+scope+", visibility: "+visibility+", filterKey: "+filterKey+", filterValue: "+filterValue+", remainPath: "+remainPath+"]");
 
-			ScopeProvider.instance.set(scope);
-			logger.info("set scope provider "+scope);
-			Configuration config = gnInstance.getGeonetworkPublisher().getConfiguration();
-			Account account = config.getScopeConfiguration().getAccounts().get(Type.CKAN);
-			logger.info("CKAN user owner is: "+account.getUser());
+			if(scope==null || scope.isEmpty()){
+				logger.error("Path Parameter 'scope' not found");
+				throw ExceptionManager.badRequestException(req, "Missing mandatory path parameter 'scope'", this.getClass(), helpURI);
+			}
 
-//			logger.info("Parameters..");
-//		   	for (Enumeration<String> e = req.getParameterNames(); e.hasMoreElements();){
-//				String p = e.nextElement();
-//			   logger.debug("param "+p + " value "+Arrays.toString(req.getParameterValues(p)));
-//		   	}
+			if(mode==null || mode.isEmpty()){
+				logger.error("Path Parameter 'scope' not found");
+				ExceptionManager.badRequestException(req, "Missing mandatory path parameter 'mode'", this.getClass(), helpURI);
+			}
 
-		   	//DEBUG BODY
-//			String readBody = IOUtils.toString(req.getReader());
-//			logger.debug("doPost read body request: "+readBody);
-			ByteArrayOutputStream byteArray = new ByteArrayOutputStream();
+			scope = ScopeUtil.normalizeScope(scope, "|");
+			mode = mode.toUpperCase();
+			try{
+				MODE.valueOf(mode);
+			}catch(Exception e){
+				List<MODE> toPrint = Arrays.asList(MODE.values());
+				logger.error("The 'mode' parameter is wrong, Have you pass a valid parameter MODE like "+toPrint+"?");
+				throw ExceptionManager.wrongParameterException(req, "The 'mode' parameter must be value of "+toPrint, this.getClass(), helpURI);
+			}
 
-			String geonetworkUrl = config.getGeoNetworkEndpoint();
+			if(visibility==null){
+				logger.error("Path Parameter 'visibility' not found");
+				throw ExceptionManager.badRequestException(req, "Missing mandatory path parameter 'visibility'", this.getClass(), helpURI);
+			}
 
-			// SPECIFIC HANDLER FOR GEONETWORK REQUEST: /srv/en/mef.export
-			if(remainPath!=null && remainPath.compareTo(SRV_EN_MEF_EXPORT)==0){
-				logger.info("In case of mef.export, perfoming a custom handler");
-				gnCSWlURL = geonetworkUrl + SRV_EN_MEF_EXPORT;
-				String[] uuidValues = req.getParameterValues(UUID);
-				if(uuidValues!=null){
-					String data = null;
-					for (String uuid : uuidValues) {
-						data = UUID+"="+uuid;
-					}
-					if(data!=null){
-						logger.debug("Writing "+data +" into byte array");
-						byteArray.write(data.getBytes());
+			visibility = visibility.toUpperCase();
+			try{
+				VISIBILITY.valueOf(visibility);
+			}catch (Exception e) {
+				List<VISIBILITY> toPrint = Arrays.asList(VISIBILITY.values());
+				logger.error("The 'visibility' parameter is wrong, Have you pass a valid parameter VISIBILITY like "+toPrint+"?");
+				throw ExceptionManager.wrongParameterException(req, "The 'visibility' parameter must be value of "+toPrint, this.getClass(), helpURI);
+			}
+
+			//HOW TO PASS ANY FILTER?
+			//TODO INVESTIGATE ON HOW TO PASS MORE THAN ONE FILTER...
+			Map<String,String> filters = new HashMap<String, String>();
+			if(filterKey!=null && filterValue!=null){
+				//IGNORING THE EMPTY FILTER 'null|null'
+				if(filterKey.compareToIgnoreCase("null")!=0){
+					filters.put(filterKey, filterValue);
+					logger.debug("Added filter parmas to map filters: "+filters);
+				}
+			}
+
+
+			try {
+
+				GeonetworkServiceInterface gntwAccess = new GeonetworkAccessParameter(scope);
+				GeonetworkInstance gnInstance = gntwAccess.getGeonetworkInstance();
+
+				ScopeProvider.instance.set(scope);
+				logger.info("set scope provider "+scope);
+				Configuration config = gnInstance.getGeonetworkPublisher().getConfiguration();
+				Account account = config.getScopeConfiguration().getAccounts().get(Type.CKAN);
+				logger.info("CKAN user owner is: "+account.getUser());
+
+	//			logger.info("Parameters..");
+	//		   	for (Enumeration<String> e = req.getParameterNames(); e.hasMoreElements();){
+	//				String p = e.nextElement();
+	//			   logger.debug("param "+p + " value "+Arrays.toString(req.getParameterValues(p)));
+	//		   	}
+
+			   	//DEBUG BODY
+	//			String readBody = IOUtils.toString(req.getReader());
+	//			logger.debug("doPost read body request: "+readBody);
+				ByteArrayOutputStream byteArray = new ByteArrayOutputStream();
+
+				String geonetworkUrl = config.getGeoNetworkEndpoint();
+
+				// SPECIFIC HANDLER FOR GEONETWORK REQUEST: /srv/en/mef.export
+				if(remainPath!=null && remainPath.compareTo(SRV_EN_MEF_EXPORT)==0){
+					logger.info("In case of mef.export, perfoming a custom handler");
+					gnCSWlURL = geonetworkUrl + SRV_EN_MEF_EXPORT;
+					String[] uuidValues = req.getParameterValues(UUID);
+					if(uuidValues!=null){
+						String data = null;
+						for (String uuid : uuidValues) {
+							data = UUID+"="+uuid;
+						}
+						if(data!=null){
+							logger.debug("Writing "+data +" into byte array");
+							byteArray.write(data.getBytes());
+						}else
+							IOUtils.copy(req.getInputStream(), byteArray);
 					}else
 						IOUtils.copy(req.getInputStream(), byteArray);
-				}else
+				}else{
+					logger.info("IS NOT A REQUEST TO "+SRV_EN_MEF_EXPORT);
+					gnCSWlURL = remainPath==null || remainPath.isEmpty()?geonetworkUrl+"/"+CSW_SERVER:geonetworkUrl+"/"+CSW_SERVER+remainPath;
 					IOUtils.copy(req.getInputStream(), byteArray);
-			}else{
-				logger.info("IS NOT A REQUEST TO "+SRV_EN_MEF_EXPORT);
-				gnCSWlURL = remainPath==null || remainPath.isEmpty()?geonetworkUrl+"/"+CSW_SERVER:geonetworkUrl+"/"+CSW_SERVER+remainPath;
-				IOUtils.copy(req.getInputStream(), byteArray);
-			}
-
-			HTTPCallsUtils httpUtils = new HTTPCallsUtils();
-
-			//PRIVATE LAYERS
-			if(visibility.equals(VISIBILITY.PRV.name())){
-				logger.info("Visibility: "+VISIBILITY.PRV+" getting private layers..");
-				//VRE LAYERS
-				if(mode.equals(MODE.VRE)){
-					logger.info("Getting "+MODE.VRE+" layers..");
-				//HARVESTED LAYERS
-				}else{
-					filters.put("isHarvested", "y");
-					logger.info("Getting "+MODE.HARVEST+" layers, I added 'isHarvested = y' to the filters ["+filters+"]");
 				}
 
-				if(account.getUser()!=null){
-					boolean authorized = GNAuthentication.login(httpUtils, geonetworkUrl, account.getUser(), account. getPassword());
-					logger.info("Authorized on "+geonetworkUrl +" ? "+authorized);
-				}else
-					logger.info("Skipping authentication, ckan user (the owner) is null");
-
-			//PUBLIC LAYERS
-			}else{
-				logger.info("Visibility: "+VISIBILITY.PUB+" getting public layers..");
-				//VRE LAYERS
-				if(mode.equals(MODE.VRE.name())){
-					logger.info("Getting "+MODE.VRE+" layers, the VRE account: "+account.getUser() +" will be used as owner user for filtering... Is it right?");
-					filters.put("ownername", account.getUser());
-				//HARVESTED LAYERS
-				}else{
-					//filters.put("isHarvested", "y");
-					logger.info("Getting "+MODE.HARVEST+" layers, I'm applying the filters ["+filters+"]");
-				}
-			}
-
-			logger.info("Sending CSW POST request to URL: "+gnCSWlURL);
-			logger.info("Content-Type: "+req.getContentType());
-
-			//DEBUG
-			//logger.debug("POST - BODY : "+byteArray.toString());
-			InputStream in = httpUtils.post(gnCSWlURL, new ByteArrayInputStream(byteArray.toByteArray()), req.getContentType(), req.getParameterMap());
-
-			if(in==null){
-				logger.warn("Input stream returned is null, sending "+HttpServletResponse.SC_NOT_FOUND);
-				ExceptionManager.notFoundException(req, "Input stream is null to the request "+gnCSWlURL+ " with body: "+byteArray.toString(), this.getClass(), help);
-			}
-
-			try{
-
-				ReusableInputStream reus = new ReusableInputStream(in);
+				HTTPCallsUtils httpUtils = new HTTPCallsUtils();
 
+				//PRIVATE LAYERS
 				if(visibility.equals(VISIBILITY.PRV.name())){
-					logger.info("Private VISIBILITY requested, retrieving public file identifiers to apply filtering..");
-					FilterGetRecords filterGetRecords = new FilterGetRecords(byteArray.toString());
-					if(filterGetRecords.getFoundPublicIds()!=null && filterGetRecords.getFoundPublicIds().size()>0){
-						logger.info("I'm removing list of public IDs with "+filterGetRecords.getFoundPublicIds().size() +" item/s. Is it right?");
-						in = GetResponseRecordFilter.overrideResponseIdsByListIds(reus, filterGetRecords.getFoundPublicIds(), REPLACED_A_PUBLIC_UUID_PLEASE_IGNORE);
+					logger.info("Visibility: "+VISIBILITY.PRV+" getting private layers..");
+					//VRE LAYERS
+					if(mode.equals(MODE.VRE)){
+						logger.info("Getting "+MODE.VRE+" layers..");
+					//HARVESTED LAYERS
+					}else{
+						filters.put("isHarvested", "y");
+						logger.info("Getting "+MODE.HARVEST+" layers, I added 'isHarvested = y' to the filters ["+filters+"]");
+					}
+
+					if(account.getUser()!=null){
+						boolean authorized = GNAuthentication.login(httpUtils, geonetworkUrl, account.getUser(), account. getPassword());
+						logger.info("Authorized on "+geonetworkUrl +" ? "+authorized);
+					}else
+						logger.info("Skipping authentication, ckan user (the owner) is null");
+
+				//PUBLIC LAYERS
+				}else{
+					logger.info("Visibility: "+VISIBILITY.PUB+" getting public layers..");
+					//VRE LAYERS
+					if(mode.equals(MODE.VRE.name())){
+						logger.info("Getting "+MODE.VRE+" layers, the VRE account: "+account.getUser() +" will be used as owner user for filtering... Is it right?");
+						filters.put("ownername", account.getUser());
+					//HARVESTED LAYERS
+					}else{
+						//filters.put("isHarvested", "y");
+						logger.info("Getting "+MODE.HARVEST+" layers, I'm applying the filters ["+filters+"]");
 					}
 				}
 
-				if(filters.size()>0){
-					logger.info("Applying filtering on geonet:info... filter/s used: "+filters);
-					Document doc = GetResponseRecordFilter.inputStreamToW3CDocument(reus);
-					List<String> fileIdentifiers = GetResponseRecordFilter.getTextContentStringsForTagName(doc, "gmd:fileIdentifier");
-					List<String> noMatchingFilter = new ArrayList<String>();
-					for (String fileId : fileIdentifiers) {
+				logger.info("Sending CSW POST request to URL: "+gnCSWlURL);
+				logger.info("Content-Type: "+req.getContentType());
 
-						//CKECKING THE FILTERS
-						for (String fkey : filters.keySet()) {
-								String value = GetResponseRecordFilter.getMetadataValueByFileIdentifier(fileId, config.getGeoNetworkEndpoint(),config.getAdminAccount().getUser(), config.getAdminAccount().getPassword(), fkey);
-								//String own = GetResponseRecordFilter.getMetaOwnerNameByFileIdentifier(fileId, config.getGeoNetworkEndpoint(),config.getAdminAccount().getUser(), config.getAdminAccount().getPassword());
-								String fValue = filters.get(fkey);
-								//Either the filter KEY doesn't matching any geonet:info (value==null)
-								//or the value of filterKey in geonet:info doesn't matching the passed filterValue (value.compareTo(fValue)!=0)
-								if(value==null || value.compareTo(fValue)!=0){
-									logger.trace(fkey +" of File Identifier "+fileId+" not matching the filter: "+fkey+" with value: "+fValue+", adding it to list to remove file identifier and exit from loop..");
-									noMatchingFilter.add(fileId);
-									//WHEN I ADD THE FILE IDENTIFIER TO FILTERED ID, I CAN EXIT FROM CKECKING FILTERS LOOP
-									break;
-								}
+				//DEBUG
+				//logger.debug("POST - BODY : "+byteArray.toString());
+				InputStream in = httpUtils.post(gnCSWlURL, new ByteArrayInputStream(byteArray.toByteArray()), req.getContentType(), req.getParameterMap());
+
+				if(in==null){
+					logger.warn("Input stream returned is null, sending "+HttpServletResponse.SC_NOT_FOUND);
+					throw ExceptionManager.notFoundException(req, "Input stream is null to the request "+gnCSWlURL+ " with body: "+byteArray.toString(), this.getClass(), helpURI);
+				}
+
+				try{
+
+					ReusableInputStream reus = new ReusableInputStream(in);
+
+					if(visibility.equals(VISIBILITY.PRV.name())){
+						logger.info("Private VISIBILITY requested, retrieving public file identifiers to apply filtering..");
+						FilterGetRecords filterGetRecords = new FilterGetRecords(byteArray.toString());
+						if(filterGetRecords.getFoundPublicIds()!=null && filterGetRecords.getFoundPublicIds().size()>0){
+							logger.info("I'm removing list of public IDs with "+filterGetRecords.getFoundPublicIds().size() +" item/s. Is it right?");
+							in = GetResponseRecordFilter.overrideResponseIdsByListIds(reus, filterGetRecords.getFoundPublicIds(), REPLACED_A_PUBLIC_UUID_PLEASE_IGNORE);
 						}
 					}
 
-					if(noMatchingFilter.size()>0){
-						logger.info("Removing "+noMatchingFilter.size()+" layer/s that not macthing the filters: "+filters);
-						//Document doc2 = GetResponseRecordFilter.inputStreamToW3CDocument(reus);
-						in = GetResponseRecordFilter.overrideResponseIdsByListIds(reus, noMatchingFilter, REPLACED_UUID_BY_FILTER_PLEASE_IGNORE);
-						//in = GetResponseRecordFilter.w3CDocumentToInputStream(doc);
+					if(filters.size()>0){
+						logger.info("Applying filtering on geonet:info... filter/s used: "+filters);
+						Document doc = GetResponseRecordFilter.inputStreamToW3CDocument(reus);
+						List<String> fileIdentifiers = GetResponseRecordFilter.getTextContentStringsForTagName(doc, "gmd:fileIdentifier");
+						List<String> noMatchingFilter = new ArrayList<String>();
+						for (String fileId : fileIdentifiers) {
+
+							//CKECKING THE FILTERS
+							for (String fkey : filters.keySet()) {
+									String value = GetResponseRecordFilter.getMetadataValueByFileIdentifier(fileId, config.getGeoNetworkEndpoint(),config.getAdminAccount().getUser(), config.getAdminAccount().getPassword(), fkey);
+									//String own = GetResponseRecordFilter.getMetaOwnerNameByFileIdentifier(fileId, config.getGeoNetworkEndpoint(),config.getAdminAccount().getUser(), config.getAdminAccount().getPassword());
+									String fValue = filters.get(fkey);
+									//Either the filter KEY doesn't matching any geonet:info (value==null)
+									//or the value of filterKey in geonet:info doesn't matching the passed filterValue (value.compareTo(fValue)!=0)
+									if(value==null || value.compareTo(fValue)!=0){
+										logger.trace(fkey +" of File Identifier "+fileId+" not matching the filter: "+fkey+" with value: "+fValue+", adding it to list to remove file identifier and exit from loop..");
+										noMatchingFilter.add(fileId);
+										//WHEN I ADD THE FILE IDENTIFIER TO FILTERED ID, I CAN EXIT FROM CKECKING FILTERS LOOP
+										break;
+									}
+							}
+						}
+
+						if(noMatchingFilter.size()>0){
+							logger.info("Removing "+noMatchingFilter.size()+" layer/s that not macthing the filters: "+filters);
+							//Document doc2 = GetResponseRecordFilter.inputStreamToW3CDocument(reus);
+							in = GetResponseRecordFilter.overrideResponseIdsByListIds(reus, noMatchingFilter, REPLACED_UUID_BY_FILTER_PLEASE_IGNORE);
+							//in = GetResponseRecordFilter.w3CDocumentToInputStream(doc);
+
+						}else{
+							logger.info("No replace on UUIDs was applied from filters: "+filters);
+							in = reus;
+						}
 
-					}else{
-						logger.info("No replace on UUIDs was applied from filters: "+filters);
-						in = reus;
 					}
 
+					ReusableInputStream reusIs = new ReusableInputStream(in);
+
+					//END DEBUG
+					logger.info("Response return Content-Type: "+httpUtils.getLastContentType());
+					return Response
+					.ok(reusIs)
+					//.header(ConstantsResolver.CONTENT_DISPOSITION,"attachment; filename = \""+fileName+"\"")
+					.header(ConstantsResolver.CONTENT_TYPE, httpUtils.getLastContentType()).build();
+
+				}catch(Exception e){
+					logger.error("Error on copy the response to send to client: ", e);
+					throw ExceptionManager.internalErrorException(req, "Error on copy the response!",  this.getClass(), helpURI);
+				}finally{
+					IOUtils.closeQuietly(in);
 				}
 
-				ReusableInputStream reusIs = new ReusableInputStream(in);
+			} catch (IllegalArgumentException e){
+				logger.error("IllegalArgumentException:", e);
+				throw ExceptionManager.badRequestException(req, "Illegal argument to carry out the request!",  this.getClass(), helpURI);
 
-				//END DEBUG
-				logger.info("Response return Content-Type: "+httpUtils.getLastContentType());
-				return Response
-				.ok(reusIs)
-				//.header(ConstantsResolver.CONTENT_DISPOSITION,"attachment; filename = \""+fileName+"\"")
-				.header(ConstantsResolver.CONTENT_TYPE, httpUtils.getLastContentType()).build();
-
-			}catch(Exception e){
-				logger.error("Error on copy the response to send to client: ", e);
-				ExceptionManager.internalErrorException(req, "Error on copy the response!",  this.getClass(), help);
-			}finally{
-				IOUtils.closeQuietly(in);
+			} catch (Exception e) {
+				logger.error("Exception:", e);
+				String error = "Sorry, an error occurred on resolving geonetwork request with scope "+scope+". Please, contact support!";
+				throw ExceptionManager.internalErrorException(req, error, this.getClass(), helpURI);
 			}
 
-		} catch (IllegalArgumentException e){
-			logger.error("IllegalArgumentException:", e);
-			ExceptionManager.badRequestException(req, "Illegal argument to carry out the request!",  this.getClass(), help);
+		}catch (Exception e) {
 
-		} catch (Exception e) {
+			if(!(e instanceof WebApplicationException)){
+				//UNEXPECTED EXCEPTION managing it as WebApplicationException
+				String error = "Error during perform POST operation to: "+gnCSWlURL+". Please, contact the support!"+"\nCause: "+e.getCause().getMessage();
+				throw ExceptionManager.internalErrorException(req, error, this.getClass(), helpURI);
+			}
+			//ALREADY MANAGED AS WebApplicationException
 			logger.error("Exception:", e);
-			String error = "Sorry, an error occurred on resolving geonetwork request with scope "+scope+". Please, contact support!";
-			ExceptionManager.internalErrorException(req, error, this.getClass(), help);
-		}
-
-		//An error occurred
-		try {
-
-			throw new InternalServerException(req, javax.ws.rs.core.Response.Status.INTERNAL_SERVER_ERROR, "Error during perform POST operation to: "+gnCSWlURL, this.getClass(), new URI(help));
-		}
-		catch (URISyntaxException e) {
-			//silent
-			return null;
+			throw (WebApplicationException) e;
 		}
 
 	}
diff --git a/src/main/java/org/gcube/datatransfer/resolver/services/GisResolver.java b/src/main/java/org/gcube/datatransfer/resolver/services/GisResolver.java
index 6616e0a..e42d229 100644
--- a/src/main/java/org/gcube/datatransfer/resolver/services/GisResolver.java
+++ b/src/main/java/org/gcube/datatransfer/resolver/services/GisResolver.java
@@ -11,6 +11,7 @@ import javax.servlet.http.HttpServletRequest;
 import javax.ws.rs.GET;
 import javax.ws.rs.Path;
 import javax.ws.rs.QueryParam;
+import javax.ws.rs.WebApplicationException;
 import javax.ws.rs.core.Context;
 import javax.ws.rs.core.Response;
 
@@ -29,11 +30,12 @@ import org.slf4j.LoggerFactory;
 import com.google.common.cache.CacheLoader.InvalidCacheLoadException;
 
 
+
 /**
  * The Class GisResolver.
  *
- * @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it
- * Nov 2, 2018
+ * @author Francesco Mangiacrapa at ISTI-CNR (francesco.mangiacrapa@isti.cnr.it)
+ * Dec 14, 2018
  */
 @Path("gis")
 public class GisResolver {
@@ -57,44 +59,49 @@ public class GisResolver {
 	 * @param gisUUID the gis uuid
 	 * @param geoExplorerUUID the geo explorer uuid
 	 * @return the response
+	 * @throws WebApplicationException the web application exception
 	 */
 	@GET
 	@Path("")
-	public Response submitGet(@Context HttpServletRequest req, @QueryParam(SCOPE) String scope, @QueryParam(GIS_UUID) String gisUUID,  @QueryParam(GEO_EXPLORER_LAYER_UUID) String geoExplorerUUID){
+	public Response submitGet(@Context HttpServletRequest req, @
+		QueryParam(SCOPE) String scope,
+		@QueryParam(GIS_UUID) String gisUUID,
+		@QueryParam(GEO_EXPLORER_LAYER_UUID) String geoExplorerUUID) throws WebApplicationException{
 
 		logger.info(this.getClass().getSimpleName()+" GET starts...");
 
-		boolean isGisLink = false;
-		boolean isGeoExplorerLink = false;
+		try{
+			boolean isGisLink = false;
+			boolean isGeoExplorerLink = false;
 
-		if(scope==null || scope.isEmpty()){
-			logger.error("Query Parameter 'scope' not found");
-			ExceptionManager.badRequestException(req, "Missing mandatory query parameter 'scope'", this.getClass(), help);
-		}
+			if(scope==null || scope.isEmpty()){
+				logger.error("Query Parameter 'scope' not found");
+				throw ExceptionManager.badRequestException(req, "Missing mandatory query parameter 'scope'", this.getClass(), help);
+			}
 
-		if(gisUUID==null || gisUUID.isEmpty()){
-			logger.error("Path Parameter 'gis-UUID' not found");
-			ExceptionManager.badRequestException(req, "Missing mandatory query parameter 'gis-UUID'", this.getClass(), help);
-		}else
-			isGisLink = true;
+			if(gisUUID==null || gisUUID.isEmpty()){
+				logger.error("Path Parameter 'gis-UUID' not found");
+				throw ExceptionManager.badRequestException(req, "Missing mandatory query parameter 'gis-UUID'", this.getClass(), help);
+			}else
+				isGisLink = true;
 
-		logger.info(SCOPE +" is: " + scope);
-		logger.info(GIS_UUID +" is: " + gisUUID);
+			logger.info(SCOPE +" is: " + scope);
+			logger.info(GIS_UUID +" is: " + gisUUID);
 
-		if (geoExplorerUUID == null || geoExplorerUUID.isEmpty()) {
-			logger.debug(GEO_EXPLORER_LAYER_UUID+ " not found");
-		}else
-			isGeoExplorerLink = true;
+			if (geoExplorerUUID == null || geoExplorerUUID.isEmpty()) {
+				logger.debug(GEO_EXPLORER_LAYER_UUID+ " not found");
+			}else
+				isGeoExplorerLink = true;
 
-		logger.info(GEO_EXPLORER_LAYER_UUID +" is: " + geoExplorerUUID);
+			logger.info(GEO_EXPLORER_LAYER_UUID +" is: " + geoExplorerUUID);
+
+			if(!isGisLink && !isGeoExplorerLink){
+				String err = GIS_UUID+" or "+GEO_EXPLORER_LAYER_UUID+" not found or empty in the query string";
+				logger.error(err);
+				throw ExceptionManager.badRequestException(req, err, this.getClass(), help);
+			}
 
-		if(!isGisLink && !isGeoExplorerLink){
-			String err = GIS_UUID+" or "+GEO_EXPLORER_LAYER_UUID+" not found or empty in the query string";
-			logger.error(err);
-			ExceptionManager.badRequestException(req, err, this.getClass(), help);
-		}
 
-		try {
 
 			if(isGisLink){
 				ScopeProvider.instance.set(scope);
@@ -115,7 +122,7 @@ public class GisResolver {
 					String gisViewerPortletUrl = LoadingGisViewerApplicationURLCache.getCache().get(scope);
 					//CHECKING IF THE GisViewer Portlet URL is valid
 					if(gisViewerPortletUrl==null || gisViewerPortletUrl.isEmpty())
-						ExceptionManager.notFoundException(req, "GisViewer Portlet URL not found in the scope: "+scope +". Please contact the support", this.getClass(), help);
+						throw ExceptionManager.notFoundException(req, "GisViewer Portlet URL not found in the scope: "+scope +". Please contact the support", this.getClass(), help);
 
 					logger.info("Gis Viewer Application url is: " + gisViewerPortletUrl);
 					gisViewerPortletUrl+="?rid="+new Random().nextLong()
@@ -140,7 +147,7 @@ public class GisResolver {
 					String geoExplorerPortletUrl = LoadingGeoExplorerApplicationURLCache.getCache().get(scope);
 					//CHECKING IF THE GeoExplorer Portlet URL is valid
 					if(geoExplorerPortletUrl==null || geoExplorerPortletUrl.isEmpty())
-						ExceptionManager.notFoundException(req, "GeoExplorer Portlet URL not found in the scope: "+scope +". Please contact the support", this.getClass(), help);
+						throw ExceptionManager.notFoundException(req, "GeoExplorer Portlet URL not found in the scope: "+scope +". Please contact the support", this.getClass(), help);
 
 					logger.info("GeoExplorer Application url is: " + geoExplorerPortletUrl);
 					geoExplorerPortletUrl+="?rid="+new Random().nextLong()
@@ -149,18 +156,22 @@ public class GisResolver {
 					return Response.seeOther(new URI(geoExplorerPortletUrl)).build();
 				}catch (InvalidCacheLoadException e) {
 					logger.error("Error on getting GeoExplorer Portlet URL for scope: "+scope, e);
-					//ExceptionManager.throwNotFoundException(req, "GeoExplorer Portlet URL not found in the scope: "+scope +". Please add it or contact the support", this.getClass(), help);
+					throw ExceptionManager.notFoundException(req, "GeoExplorer Portlet URL not found in the scope: "+scope +". Please add it or contact the support", this.getClass(), help);
 				}
 			}
 
-			ExceptionManager.badRequestException(req, GIS_UUID+" or "+GEO_EXPLORER_LAYER_UUID+" not found or empty in the query string", this.getClass(), help);
-			return null;
+			throw ExceptionManager.badRequestException(req, GIS_UUID+" or "+GEO_EXPLORER_LAYER_UUID+" not found or empty in the query string", this.getClass(), help);
 
-		} catch (Exception e) {
+		}catch (Exception e) {
+
+			if(!(e instanceof WebApplicationException)){
+				//UNEXPECTED EXCEPTION managing it as WebApplicationException
+				String error = "Sorry, an error occurred on resolving request with UUID "+gisUUID+" and scope "+scope+". Please, contact support!"+"\n Cause: "+e.getCause().getMessage();
+				throw ExceptionManager.internalErrorException(req, error, this.getClass(), help);
+			}
+			//ALREADY MANAGED AS WebApplicationException
 			logger.error("Exception:", e);
-			String error = "Sorry, an error occurred on resolving request with UUID "+gisUUID+" and scope "+scope+". Please, contact support!";
-			ExceptionManager.internalErrorException(req, error, this.getClass(), help);
-			return null;
+			throw (WebApplicationException) e;
 		}
 
 	}
diff --git a/src/main/java/org/gcube/datatransfer/resolver/services/PartheosRegistryResolver.java b/src/main/java/org/gcube/datatransfer/resolver/services/PartheosRegistryResolver.java
index d7605d2..133d544 100644
--- a/src/main/java/org/gcube/datatransfer/resolver/services/PartheosRegistryResolver.java
+++ b/src/main/java/org/gcube/datatransfer/resolver/services/PartheosRegistryResolver.java
@@ -79,8 +79,7 @@ public class PartheosRegistryResolver {
 		}catch (Exception e) {
 			logger.error("Exception:", e);
 			String error = "Error occurred on resolving the path "+remainPathParthenosURL+". Please, contact the support!";
-			ExceptionManager.internalErrorException(req, error, this.getClass(), helpURI);
-			return null;
+			throw ExceptionManager.internalErrorException(req, error, this.getClass(), helpURI);
 		}
 
 	}