Fix typo

Change-Id: I0403aa3924ccd7e6fa4e8fee41c7ec392e95c5c2
diff --git a/src/main/java/com/google/gwtorm/schema/Util.java b/src/main/java/com/google/gwtorm/schema/Util.java
index 0230cf5..6a55c72 100644
--- a/src/main/java/com/google/gwtorm/schema/Util.java
+++ b/src/main/java/com/google/gwtorm/schema/Util.java
@@ -44,7 +44,7 @@
     String friendlyName = r.toString();
     if (friendlyName.length() > 30) {
       throw new IllegalArgumentException(String.format(
-          "Identifier '%s' for name '%s' is greater then 30 characters",
+          "Identifier '%s' for name '%s' is greater than 30 characters",
           friendlyName, name));
     }
     return friendlyName;