diff -r 31e427387ab5 -r 29e308b56d23 src/HOL/MicroJava/J/WellForm.thy
--- a/src/HOL/MicroJava/J/WellForm.thy	Wed Mar 12 22:57:50 2014 +0100
+++ b/src/HOL/MicroJava/J/WellForm.thy	Thu Mar 13 07:07:07 2014 +0100
@@ -565,7 +565,7 @@
 apply clarify
 apply (frule wf_prog_ws_prog)
 apply (frule fields_Object, assumption+)
-apply (simp only: is_class_Object) apply simp
+apply (simp only: is_class_Object)
 
 apply clarify
 apply (frule fields_rec)