--- a/hotspot/src/share/vm/opto/cfgnode.cpp	Thu Dec 03 14:20:22 2009 -0800
+++ b/hotspot/src/share/vm/opto/cfgnode.cpp	Thu Jan 21 10:07:59 2010 -0800
@@ -956,6 +956,7 @@
     }
     if( jtkp && ttkp ) {
       if( jtkp->is_loaded() &&  jtkp->klass()->is_interface() &&
+          !jtkp->klass_is_exact() && // Keep exact interface klass (6894807)
           ttkp->is_loaded() && !ttkp->klass()->is_interface() ) {
         assert(ft == ttkp->cast_to_ptr_type(jtkp->ptr()) ||
                ft->isa_narrowoop() && ft->make_ptr() == ttkp->cast_to_ptr_type(jtkp->ptr()), "");