src/java.base/share/classes/com/sun/java/util/jar/pack/Package.java

*** 1,7 ****
  /*
!  * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
--- 1,7 ----
  /*
!  * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
*** 474,484 ****
                      changed = 1;  // added more tuples
                  }
              } else if (localICs.isEmpty()) {
                  // It was a non-empty diff, but the local ICs were absent.
                  actualICs = null;
!                 changed = 0;  // [] => null, no tuple change
              } else {
                  // Non-trivial diff was transmitted.
                  actualICs = computeICdiff();
                  // If we only added more ICs, return +1.
                  changed = actualICs.containsAll(localICs)? +1: -1;
--- 474,484 ----
                      changed = 1;  // added more tuples
                  }
              } else if (localICs.isEmpty()) {
                  // It was a non-empty diff, but the local ICs were absent.
                  actualICs = null;
!                 changed = -1;  // [] => null, no tuple change, force recomputation
              } else {
                  // Non-trivial diff was transmitted.
                  actualICs = computeICdiff();
                  // If we only added more ICs, return +1.
                  changed = actualICs.containsAll(localICs)? +1: -1;