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  1. JDK
  2. JDK-4682251

List returned by Collections.unmodifiableList in 1.4 won't deserialize in 1.3

    Details

    • Subcomponent:
    • Resolved In Build:
      beta
    • CPU:
      sparc
    • OS:
      solaris_2.6
    • Verification:
      Verified

      Description



      Name: rmT116609 Date: 05/09/2002


      FULL PRODUCT VERSION :
      java version "1.4.0"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-b92)
      Java HotSpot(TM)Client VM (build 1.4.0-b92, mixed mode)

      FULL OPERATING SYSTEM VERSION :
      Solaris 2.6

      A DESCRIPTION OF THE PROBLEM :
      The Collections framework has been modified in 1.4. Specifically, a call to Collections.unmodifiableList() will now return either:

      an instance of UnmodifiableList (as per 1.3)
      or
      an instance of UnmodifiableRandomAccessList (if the underlying List implements RandomAccess).

      This latter class is not present in 1.3.

      This can lead to unmarshalling/ClassNotFound errors when serializing an instance of UnmodifiableList from a 1.4 JVM to a 1.3 JVM.

      There appears to be no reference to this anywhere in the compatibility/release notes for 1.4.

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      1. As given in the description box.

      ERROR MESSAGES/STACK TRACES THAT OCCUR :
      java.rmi.ServerException: RemoteException occurred in server thread; nested
      exception is:
         java.rmi.UnmarshalException: error unmarshalling arguments; nested
      exception is:
      java.lang.ClassNotFoundException:
      java.util.Collections$UnmodifiableRandomAccessList


      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      class TheUnmodifiable {

              public static void main(String[] args) {
                  System.out.println(java.util.Collections.unmodifiableList(new
      java.util.ArrayList()).getClass().getName());
              }
          }

      Compile this and run it on 1.3.x and 1.4. The outputs are different.

      ---------- END SOURCE ----------

      With JDK1.3.1_03:
      -----------------
      $java TheUnmodifiable
      java.util.Collections$UnmodifiableList

      With JDK1.4.0:
      ---------------
      $java TheUnmodifiable
      java.util.Collections$UnmodifiableRandomAccessList

      CUSTOMER WORKAROUND :
      The only workaround is not to use Collections.unmodifiableList().
      (Review ID: 146368)
      ======================================================================

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            • Assignee:
              jjb Josh Bloch
              Reporter:
              rmandalasunw Ranjith Mandala (Inactive)
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