BUG: NullPointer for message code

conf/usersources.ini.template

@@ -32,4 +32,4 @@ default_status = ACTIVE
 ;exclude.group = [uncomment and put excluded groups here]
 
 ;it is necessary to add at least one admin
-user.{a user}.roles = administration
+;user.[uncomment a set a username here].roles = administration

src/main/java/caosdb/server/entity/Message.java

@@ -79,20 +79,20 @@ public class Message extends Exception implements Comparable<Message>, ToElement
     this(type, code, null, null);
   }
 
-  public Message(final int code, final String description) {
+  public Message(final Integer code, final String description) {
     this("Message", code, description, null);
   }
 
-  public Message(final MessageType type, final int code, final String description) {
+  public Message(final MessageType type, final Integer code, final String description) {
     this(type.toString(), code, description, null);
   }
 
   public Message(
-      final MessageType type, final int code, final String description, final String body) {
+      final MessageType type, final Integer code, final String description, final String body) {
     this(type.toString(), code, description, body);
   }
 
-  public Message(final String type, final int code, final String description) {
+  public Message(final String type, final Integer code, final String description) {
     this(type, code, description, null);
   }