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  1. Commons Collections
  2. COLLECTIONS-266

Issue with MultiKey when serialized/deserialized via RMI

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Details

    • Bug
    • Status: Closed
    • Minor
    • Resolution: Fixed
    • 3.2
    • 3.2.2, 4.0-alpha1, 4.0
    • KeyValue
    • None

    Description

      This is because the hash code of MultiKey is calculated only once.

      So if the MultiKey is deserialized in an other jvm, and if one at least of the subkeys defines its hash code with System.identityHashCode() (for example all the enums does), then the hash code of the MultiKey is no longer valid, and you can't retreive the key in your Map.

      I fixed it by making the cached hash code field transient, and by recalculating the hash code during deserialization.

      Attachments

        1. TestCollections266.java
          2 kB
          Henri Yandell
        2. TestCollections266.java
          3 kB
          Julien Buret
        3. TestCollections266.java
          2 kB
          Henri Yandell
        4. MultiKey.java
          9 kB
          Julien Buret
        5. collections-testcase-266.diff
          3 kB
          Joerg Schaible
        6. COLLECTIONS-266.patch
          2 kB
          Henri Yandell
        7. CC-266-final.patch
          4 kB
          Joerg Schaible

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. COLLECTIONS-576 MultiKey subclassing has deserialization problem since COLLECTIONS-266: either declare protected readResolve() or MultiKey must be final

          • Major - Major loss of function.
          • Closed

          Activity

            People

              Unassigned Unassigned
              jburet Julien Buret
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              Dates

                Created:
                Updated:
                Resolved: