Merge branch 'master' of https://github.com/FasterXML/jackson-databind
diff --git a/src/main/java/com/fasterxml/jackson/databind/introspect/ObjectIdInfo.java b/src/main/java/com/fasterxml/jackson/databind/introspect/ObjectIdInfo.java
index 13f5c82..54307f1 100644
--- a/src/main/java/com/fasterxml/jackson/databind/introspect/ObjectIdInfo.java
+++ b/src/main/java/com/fasterxml/jackson/databind/introspect/ObjectIdInfo.java
@@ -50,6 +50,9 @@
         _scope = scope;
         _generator = gen;
         _alwaysAsId = alwaysAsId;
+        if (resolver == null) {
+            resolver = SimpleObjectIdResolver.class;
+        }
         _resolver = resolver;
     }