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  1. JDK
  2. JDK-6369051

javac cannot handle += operator correctly in Genericized code

    Details

    • Type: Bug
    • Status: Closed
    • Priority: P4
    • Resolution: Duplicate
    • Affects Version/s: 5.0
    • Fix Version/s: None
    • Component/s: tools
    • Subcomponent:
    • CPU:
      sparc
    • OS:
      solaris_10

      Description

      FULL PRODUCT VERSION :
      java version "1.5.0_06"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
      Java HotSpot(TM) Server VM (build 1.5.0_06-b05, mixed mode)


      ADDITIONAL OS VERSION INFORMATION :
      SunOS Generic_118822-01 sun4u sparc SUNW,Sun-Fire-880

      A DESCRIPTION OF THE PROBLEM :
      Comiling the code below produces an error at the statement "value += 1;",
      although no error with the equivalent statement "value = value + 1;"

      Value.java:8: operator + cannot be applied to java.lang.Object,int
      value += 1;
                    ^



      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
        To compile the source code below with javac.

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      It should be compiled without an error.
      ACTUAL -
      Value.java:8: operator + cannot be applied to java.lang.Object,int
      value += 1;
                    ^

      ERROR MESSAGES/STACK TRACES THAT OCCUR :
      Value.java:8: operator + cannot be applied to java.lang.Object,int
      value += 1;
                    ^

      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      public class Value<T> {
          public T value;
      }

      class IntegerValue extends Value<Integer> {
          void increment() {
      value = value + 1;
      value += 1;
          }
      }
      ---------- END SOURCE ----------

      CUSTOMER SUBMITTED WORKAROUND :
      Do not use += operator.

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              • Assignee:
                Unassigned
                Reporter:
                ndcosta Nelson Dcosta (Inactive)
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                • Created:
                  Updated:
                  Resolved:
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