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  1. JDK
  2. JDK-6946211

Multiple generic types cause weaker access privileges error on clone()

    Details

    • Subcomponent:
    • CPU:
      generic, x86
    • OS:
      generic, windows_xp, windows_7

      Description

      FULL PRODUCT VERSION :
      java version "1.6.0_20"
      Java(TM) SE Runtime Environment (build 1.6.0_20-b02)
      Java HotSpot(TM) Client VM (build 16.3-b01, mixed mode, sharing)

      ADDITIONAL OS VERSION INFORMATION :
      Microsoft Windows [Version 6.1.7600]

      A DESCRIPTION OF THE PROBLEM :
      The compiler fails if a base interface includes a clone() method and an extended interface has multiple generic types. The error message is the same as Bug ID: 4185308 but the cause is different.
      (Note that the sample code compiles correctly in the Eclipse Java compiler.)

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Put the source code for an executable test case into two separate files in the same directory. Compile them. You should get a compiler error.


      ERROR MESSAGES/STACK TRACES THAT OCCUR :
      SubType.java:1: clone() in java.lang.Object cannot implement clone() in BaseType; attempting to assign weaker access privileges; was public
      public interface SubType<T extends BaseType & java.io.Closeable> extends BaseType {
                               ^
      1 error


      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      public interface BaseType {
          BaseType clone() throws CloneNotSupportedException;
      }

      public interface SubType<T extends BaseType & java.io.Closeable> extends BaseType {
      }

      ---------- END SOURCE ----------

      CUSTOMER SUBMITTED WORKAROUND :
      Modify SubType so that the generic type parameter T extends only BaseType, not Closeable.

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              • Assignee:
                mcimadamore Maurizio Cimadamore
                Reporter:
                ndcosta Nelson Dcosta
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                  Updated:
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