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  1. JDK
  2. JDK-5059911

(reflect) Final fields can be modified via Field.set - expect IllegalAccessExcep

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    • Icon: Bug Bug
    • Resolution: Not an Issue
    • Icon: P3 P3
    • None
    • 5.0
    • core-libs



      Name: gm110360 Date: 06/08/2004


      FULL PRODUCT VERSION :
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta2-b51)
      Java HotSpot(TM) Client VM (build 1.5.0-beta2-b51, mixed mode, sharing)

      ADDITIONAL OS VERSION INFORMATION :
      Microsoft Windows XP [Version 5.1.2600]

      A DESCRIPTION OF THE PROBLEM :
      A private final int variable of a class can be modified via reflection

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      just execute the source below

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      an IllegalAccessException should be thrown
      ACTUAL -
      the value can be set without exception

      ERROR MESSAGES/STACK TRACES THAT OCCUR :
      ---none---

      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      import java.lang.reflect.*;

      public class Test
      {
      public static void main(String[] tooralooraloo) throws Throwable
      {
      Change change = new Change(42);
      System.out.println("before: "+change);

      Field f = change.getClass().getDeclaredField("number");
      f.setAccessible(true);

      f.set(change, new Integer(666) );
      System.out.println("after: "+change);
      }
      }

      class Change
      {
      private final int number;

      Change(int x)
      {
      number = x;
      }

      public String toString()
      {
      return number + "";
      }
      }
      ---------- END SOURCE ----------

      CUSTOMER SUBMITTED WORKAROUND :
      ---none---

      Release Regression From : 1.4.2
      The above release value was the last known release where this
      bug was known to work. Since then there has been a regression.

      (Incident Review ID: 276697)
      ======================================================================

            iris Iris Clark
            gmanwanisunw Girish Manwani (Inactive)
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