diff --git a/src/main/java/de/ids_mannheim/korap/handlers/ResourceDao.java b/src/main/java/de/ids_mannheim/korap/handlers/ResourceDao.java
index 12193ca..6abc72b 100644
--- a/src/main/java/de/ids_mannheim/korap/handlers/ResourceDao.java
+++ b/src/main/java/de/ids_mannheim/korap/handlers/ResourceDao.java
@@ -109,6 +109,7 @@
                     new RowMapperFactory.ResourceMapper());
         }
         catch (DataAccessException e) {
+        	// empty results
             return null;
         }
     }
diff --git a/src/main/java/de/ids_mannheim/korap/web/service/full/ResourceService.java b/src/main/java/de/ids_mannheim/korap/web/service/full/ResourceService.java
index cb0279c..afc4851 100644
--- a/src/main/java/de/ids_mannheim/korap/web/service/full/ResourceService.java
+++ b/src/main/java/de/ids_mannheim/korap/web/service/full/ResourceService.java
@@ -1,8 +1,33 @@
 package de.ids_mannheim.korap.web.service.full;//package de.ids_mannheim.korap.ext.web;
 
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Set;
+
+import javax.ws.rs.DELETE;
+import javax.ws.rs.GET;
+import javax.ws.rs.POST;
+import javax.ws.rs.Path;
+import javax.ws.rs.PathParam;
+import javax.ws.rs.Produces;
+import javax.ws.rs.QueryParam;
+import javax.ws.rs.core.Context;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.MultivaluedMap;
+import javax.ws.rs.core.Response;
+import javax.ws.rs.core.SecurityContext;
+import javax.ws.rs.core.UriBuilder;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import com.fasterxml.jackson.databind.JsonNode;
 import com.sun.jersey.core.util.MultivaluedMapImpl;
 import com.sun.jersey.spi.container.ResourceFilters;
+
 import de.ids_mannheim.korap.config.Attributes;
 import de.ids_mannheim.korap.config.BeansFactory;
 import de.ids_mannheim.korap.config.KustvaktConfiguration;
@@ -13,29 +38,30 @@
 import de.ids_mannheim.korap.interfaces.AuthenticationManagerIface;
 import de.ids_mannheim.korap.query.serialize.MetaQueryBuilder;
 import de.ids_mannheim.korap.query.serialize.QuerySerializer;
-import de.ids_mannheim.korap.resource.rewrite.*;
-import de.ids_mannheim.korap.resources.*;
+import de.ids_mannheim.korap.resource.rewrite.RewriteHandler;
+import de.ids_mannheim.korap.resources.Corpus;
+import de.ids_mannheim.korap.resources.KustvaktResource;
+import de.ids_mannheim.korap.resources.Layer;
+import de.ids_mannheim.korap.resources.Permissions;
+import de.ids_mannheim.korap.resources.ResourceFactory;
+import de.ids_mannheim.korap.resources.VirtualCollection;
 import de.ids_mannheim.korap.security.ac.ResourceFinder;
 import de.ids_mannheim.korap.security.ac.ResourceHandler;
 import de.ids_mannheim.korap.security.ac.SecurityManager;
 import de.ids_mannheim.korap.user.TokenContext;
 import de.ids_mannheim.korap.user.User;
-import de.ids_mannheim.korap.utils.*;
+import de.ids_mannheim.korap.utils.JsonUtils;
+import de.ids_mannheim.korap.utils.KoralCollectionQueryBuilder;
+import de.ids_mannheim.korap.utils.KustvaktLogger;
+import de.ids_mannheim.korap.utils.StringUtils;
 import de.ids_mannheim.korap.web.ClientsHandler;
 import de.ids_mannheim.korap.web.KustvaktServer;
 import de.ids_mannheim.korap.web.SearchKrill;
 import de.ids_mannheim.korap.web.TRACE;
 import de.ids_mannheim.korap.web.filter.AuthFilter;
-import de.ids_mannheim.korap.web.filter.BlockingFilter;
 import de.ids_mannheim.korap.web.filter.DemoUserFilter;
 import de.ids_mannheim.korap.web.filter.PiwikFilter;
 import de.ids_mannheim.korap.web.utils.KustvaktResponseHandler;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import javax.ws.rs.*;
-import javax.ws.rs.core.*;
-import java.util.*;
 
 /**
  * @author hanl