[Bug] Compiler bug in JDev 10.1.3.0.4 (SU5)

Question

Hello,
I would like to report a bug with Java 5 compiler in JDev 10.1.3.0.4 (SU5) build JDEV_ADF_10.1.3_NT_030125.0900.3673 regarding covariant return types.
As of Java 5, it's now possible to override a method with a different return type as long as the new return type is a subclass of the overridden method's return type. JDeveloper compiler will manage that correctly (no compilation error), but will result in a java.lang.AbstractMethodError if the overriding definition come from an interface.
So the reproduction case is :
public interface Interface1 {
   public Object myMethod();
public interface Interface2 extends Interface1 {
  public String myMethod();
public abstract class AbstractInterface2 implements Interface2 {
public class MyClass extends AbstractInterface2 {
  public String myMethod() {
    return "Hello"!;
public static void main(String... args) {
  Interface1 myObject = new MyClass();
  myObject.myMethod();
}I did not test with other JDev version.
Regards,
Simon Lessard

Answer 1

quick workaround is to set project output directory to the WEB-INF/classes directory and compile the jsp from jdeveloper, oc4j then updates the loaded class file without re-compiling the jsp.
This works fine, but if I let OC4J try to compile the JSP problem still occurs, anyone have any ideas why either of these problems occur?