Refactored code

src/main/java/net/gepafin/tendermanagement/service/CallService.java

@@ -32,5 +32,5 @@ public interface CallService {
 	CallEntity validateCall(Long callId);
 
 	 CallEntity validatePublishedCall(Long callId);
-
+	byte[] downloadCallDocumentsAsZip(Long callId);
 	}

src/main/java/net/gepafin/tendermanagement/service/impl/CallServiceImpl.java

@@ -92,4 +92,9 @@ public class CallServiceImpl implements CallService {
     public CallEntity validatePublishedCall(Long callId) {
     return   callDao.validatePublishedCall(callId);
     }
+    @Override
+    @Transactional(readOnly = true)
+    public byte[] downloadCallDocumentsAsZip(Long callId) {
+        return callDao.downloadCallDocumentsAsZip(callId);
+    }
     }