feat: draft validation sample java

.cdsrc.json

@@ -1 +1,6 @@
-{}
+{
+  "requires": {
+    "destinations": true,
+    "html5-repo": true
+  }
+}

app/common.cds

@@ -2,6 +2,6 @@ using { Currency } from '../db/common';
 
 
 // Workarounds for overly strict OData libs and clients
-annotate cds.UUID with @UI.Hidden  @odata.Type : 'Edm.String';
+annotate cds.UUID with @UI.Hidden;
 
 annotate Currency with @Common.UnitSpecificScale : 'Decimals';