diff -r 7ae4016c5938 -r 584365f256a7 src/share/classes/com/sun/tools/javac/jvm/ClassWriter.java
--- a/src/share/classes/com/sun/tools/javac/jvm/ClassWriter.java	Tue Sep 07 17:31:54 2010 +0100
+++ b/src/share/classes/com/sun/tools/javac/jvm/ClassWriter.java	Tue Sep 07 17:32:27 2010 +0100
@@ -652,13 +652,6 @@
             endAttr(alenIdx);
             acount++;
         }
-        if ((flags & POLYMORPHIC_SIGNATURE) != 0) {
-            if (target.majorVersion < 51)
-                throw new AssertionError("PolymorphicSignature attributes in java/dyn must be written with -target 7 (required major version is 51, current is"+target.majorVersion+")");
-            int alenIdx = writeAttr(names.PolymorphicSignature);
-            endAttr(alenIdx);
-            acount++;
-        }
         return acount;
     }