FULL PRODUCT VERSION :
java version "1.7.0-ea-fastdebug"
Java(TM) SE Runtime Environment (build 1.7.0-ea-fastdebug-b135)
Java HotSpot(TM) Client VM (build 21.0-b05-fastdebug, mixed mode)

A DESCRIPTION OF THE PROBLEM :
javap prints "extends java.lang.Object".

$ javap java.lang.Comparable
Compiled from "Comparable.java"
public interface java.lang.Comparable<T extends java.lang.Object> extends java.lang.Object {
                                                                  ^^^^^^^^^^^^^^^^^^^^^^^^
  public abstract int compareTo(T);
}

But, javap does not print "extends java.lang.Object".

$ javap java.lang.Runnable
Compiled from "Runnable.java"
public interface java.lang.Runnable {
  public abstract void run();
}

http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6715757


REPRODUCIBILITY :
This bug can be reproduced always.