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  1. JDK
  2. JDK-6232484

(coll) ArrayList made from IdentityHashMap.entrySet() fails to create properly

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    • b51
    • x86
    • windows_2000
    • Verified

      FULL PRODUCT VERSION :
      compiled on windows with java version "1.5.0"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-b64)
      Java HotSpot(TM) Client VM (build 1.5.0-b64, mixed mode, sharing)

      or java version "1.4.2"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2-b28)
      Java HotSpot(TM) Client VM (build 1.4.2-b28, mixed mode)


      run on Windows with java version "1.5.0"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-b64)
      Java HotSpot(TM) Client VM (build 1.5.0-b64, mixed mode, sharing)

      run on linux with java version "1.5.0"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-b64)
      Java HotSpot(TM) Client VM (build 1.5.0-b64, mixed mode, sharing)



      ADDITIONAL OS VERSION INFORMATION :
      Windows 2000 SP4 (Microsoft Windows 2000 [Version 5.00.2195]),
      Linux (Linux 2.6.4 #1 SMP i686 GNU/Linux)



      A DESCRIPTION OF THE PROBLEM :
      When creating a new ArrayList passing it a result of entrySet() called on IdentityHashMap of size one, the resulting ArrayList is of size one but contains null instead of a reference to object the original IdentityHashMap contains.

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Compile and run the sample testcase provided.

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      ls: [com.parsek.test.BugTest$KeyClass@35ce36=com.parsek.test.BugTest$ValueClass@1a46e30]
      ls2: [com.parsek.test.BugTest$KeyClass@35ce36=com.parsek.test.BugTest$ValueClass@1a46e30]
      ACTUAL -
      ls: [null]
      ls2: [com.parsek.test.BugTest$KeyClass@35ce36=com.parsek.test.BugTest$ValueClass@1a46e30]

      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      import java.util.*;

      public class BugTest {

      static class KeyClass {
      String somefield;
      }

      static class ValueClass {
      String somevalue;
      }

      public static void main(String [] args) throws Exception {

      IdentityHashMap map = new IdentityHashMap();
      map.put(new KeyClass(), new ValueClass());

      ArrayList ls = new ArrayList(map.entrySet());
      System.out.println("ls: " + ls);

      LinkedList ls2 = new LinkedList(map.entrySet());
      System.out.println("ls2: " + ls2);

      }
      }
      ---------- END SOURCE ----------

      CUSTOMER SUBMITTED WORKAROUND :
      Use LinkedList or HashSet instead of ArrayList
      ###@###.### 2005-2-24 02:21:22 GMT

            martin Martin Buchholz
            gmanwanisunw Girish Manwani (Inactive)
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              Created:
              Updated:
              Resolved:
              Imported:
              Indexed: