diff --git a/java/org/slub/rosetta/dps/repository/plugin/XmlFormatValidationPlugin.java b/java/org/slub/rosetta/dps/repository/plugin/XmlFormatValidationPlugin.java
index 60b7d115a0394e1f21003bd6f48fe6f92a16ca61..5a1bfd01e5aafa69635d6defc98e1eb5c6314eb8 100644
--- a/java/org/slub/rosetta/dps/repository/plugin/XmlFormatValidationPlugin.java
+++ b/java/org/slub/rosetta/dps/repository/plugin/XmlFormatValidationPlugin.java
@@ -90,12 +90,12 @@ public class XmlFormatValidationPlugin implements FormatValidationPlugin {
                     resultHandle.error("invalid entry(" + i + ") in namespace schema map file " + namespaceSchemaMapFile);
                 }
             }
-        } catch (ParserConfigurationException | SAXException | IOException | URISyntaxException e) {
+        } catch (ParserConfigurationException | SAXException | IOException | URISyntaxException | SchemaCatalogException e) {
             resultHandle.error("parsing expection parsing namespace schema map file " + namespaceSchemaMapFile + " ," + e.getMessage());
         }
     }
 
-    private void addtoNamespaceSchemaMap(String namespaceSchemaMapFile, String attr_type, String namespace, String sUri) throws URISyntaxException, SAXException {
+    private void addtoNamespaceSchemaMap(String namespaceSchemaMapFile, String attr_type, String namespace, String sUri) throws URISyntaxException, SAXException, SchemaCatalogException {
         ValidationSchemaType schematype = ValidationSchemaType.nothing;
         switch (attr_type) {
             case "schema" -> schematype = ValidationSchemaType.schema;
@@ -116,12 +116,12 @@ public class XmlFormatValidationPlugin implements FormatValidationPlugin {
     }
 
 
-    private ValidationSchema getValidationSchemaIfPresent(String namespaceSchemaMapFile, String namespace, String sUri, ValidationSchemaType schematype) throws URISyntaxException, SAXException {
-        ValidationSchema v;
-        if (
-                isWrongFileUri(sUri)
-        ) {
-            resultHandle.error("attribute schemauri should be start with: 'http://$server/path', 'https://$server/path' or 'file://localhost/path' to ensure coorect working, got: " + sUri);
+    private ValidationSchema getValidationSchemaIfPresent(String namespaceSchemaMapFile, String namespace, String sUri, ValidationSchemaType schematype) throws URISyntaxException, SAXException, SchemaCatalogException {
+        if ( null == sUri || sUri.isBlank()) {
+            throw new SchemaCatalogException("for namespace " + namespace + "attribute schemauri is empty or non-existent!");
+        }
+        if ( isWrongFileUri(sUri) ) {
+            throw new SchemaCatalogException("for namespace " + namespace + "attribute schemauri should be start with: 'http://$server/path', 'https://$server/path' or 'file://localhost/path' to ensure coorect working, got: " + sUri);
         }
         URI uri;
         if (
@@ -132,10 +132,11 @@ public class XmlFormatValidationPlugin implements FormatValidationPlugin {
             uri = remapUri(namespaceSchemaMapFile, sUri);
             resultHandle.debug("SCHEMACATALOG, remap " + sUri + " to URI: " + uri);
         }
-        v = new ValidationSchema(namespace, schematype, uri);
+        ValidationSchema v = new ValidationSchema(namespace, schematype, uri);
         return v;
     }
 
+
     private static boolean isNonRelativeUri(String sUri) {
         return (sUri.startsWith("http://"))
                 || (sUri.startsWith("https://"))