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  1. JDK
  2. JDK-6355696

Compiler can not make boxing in a method call

    Details

    • Subcomponent:
    • CPU:
      x86
    • OS:
      windows_2003

      Description

      FULL PRODUCT VERSION :
      java version "1.5.0_05"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_05-b05)
      Java HotSpot(TM) Client VM (build 1.5.0_05-b05, mixed mode, sharing)

      ADDITIONAL OS VERSION INFORMATION :
      Windows 2000 Server SP4

      A DESCRIPTION OF THE PROBLEM :
      Compiler does not compile the following code:

      class Rare {
          public static void main( String... args ) {
      genericMethod( 5 );
      }

          static <T extends Integer> void genericMethod( T i ) {
           System.out.println( i.getClass().getName() );
          }
      }

      The output error message is:

      Rare.java:3: cannot find symbol
      symbol : method valueOf(int)
      location: bound of type variable T
                      genericMethod( 5 );
                                     ^
      Fatal Error: Unable to find method valueOf

      The problem seems that the compiler can not do boxing, and show a FatalError making reference to the valueOf method of the Integer wrapper class.

      This bug is present with all primitive wrappers: Byte, Short, Integer, Long, Float, Double, Boolean.

      The following variations compiles fine

      class NotRare {
          public static void main( String... args ) {
      genericMethod( 5 );
      }

          static <T extends Number> void genericMethod( T i ) {
           System.out.println( i.getClass().getName() );
          }
      }
      Output: java.lang.Integer
      ( Boxing to Integer works fine )

      class NotRare {
          public static void main( String... args ) {
      genericMethod( 5 );
      }

          static <T extends Integer> void genericMethod( T... i ) {
           System.out.println( i.getClass().getName() );
          }
      }
      Output: [Ljava.lang.Integer;
      (Boxing to Array of Integer)


      class NotRare {
          public static void main( String... args ) {
      genericMethod( new Integer(5) );
      }

          static <T extends Integer> void genericMethod( T i ) {
           System.out.println( i.getClass().getName() );
          }
      }
      Output: java.lang.Integer
      (Explicit Integer argument)

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      Compiles fine and show the following Output

      java.lang.Integer

      ERROR MESSAGES/STACK TRACES THAT OCCUR :
      Rare.java:3: cannot find symbol
      symbol : method valueOf(int)
      location: bound of type variable T
                      genericMethod( 5 );
                                     ^
      Fatal Error: Unable to find method valueOf

      REPRODUCIBILITY :
      This bug can be reproduced always.

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              • Assignee:
                Unassigned
                Reporter:
                jssunw Jitender S (Inactive)
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                • Created:
                  Updated:
                  Resolved:
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