Generic Comparator compile issue

Question

hi
In JDeveloper 10.1.3.2.0.4066 this code ...
package genericcomparatorcompileissue;
import java.util.Collections;
import java.util.Comparator;
import java.util.LinkedList;
import java.util.List;
public class GenericComparatorCompileIssue
     private static interface MyRow {};
     private static class MyRowImpl implements MyRow {};
     private static class MyRowComparator implements Comparator<MyRowImpl>
          public int compare(MyRowImpl pFirstMyRowImpl, MyRowImpl pSecondMyRowImpl)
               return 0;
     public static void main(String[] pArguments)
          System.out.println("GenericComparatorCompileIssue.main() : begin");
          List<MyRow> vMyRowList = new LinkedList<MyRow>();
          Collections.sort(vMyRowList, new MyRowComparator());
          System.out.println("GenericComparatorCompileIssue.main() : end");
}... compiles and runs and produces this output:
GenericComparatorCompileIssue.main() : begin
GenericComparatorCompileIssue.main() : endBut if you check the "Use Javac" Compiler option in the Project Properties dialog, the compiler reports a "cannot find symbol" error at line 25.
How can this be explained?
many thanks
Jan Vervecken

Answer 1

This problem has been reported as
BUG 6311332 - OJC ALLOWS WRONG PARAMTERS FOR COLLECTIONS.SORT(...)
This bug will be fixed with JDeveloper 11. (It is not yet fixed with the development preview!)
As a workaround you can use javac instead of ojc for compilation. javac will report such wrong assignments. You need to compile with ojc only if you want to use JDeveloper profiling or code coach.