diff -r a9c04a57a39f -r 3d539f4123b8 src/share/classes/com/sun/tools/javac/jvm/ClassWriter.java
--- a/src/share/classes/com/sun/tools/javac/jvm/ClassWriter.java	Tue Jun 16 10:45:11 2009 +0100
+++ b/src/share/classes/com/sun/tools/javac/jvm/ClassWriter.java	Tue Jun 16 10:45:42 2009 +0100
@@ -1521,9 +1521,9 @@
         int acount = 0;
 
         boolean sigReq =
-            typarams.length() != 0 || supertype.getTypeArguments().length() != 0;
+            typarams.length() != 0 || supertype.allparams().length() != 0;
         for (List<Type> l = interfaces; !sigReq && l.nonEmpty(); l = l.tail)
-            sigReq = l.head.getTypeArguments().length() != 0;
+            sigReq = l.head.allparams().length() != 0;
         if (sigReq) {
             assert source.allowGenerics();
             int alenIdx = writeAttr(names.Signature);