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Re: [aspectj-users] Issue with generics

I just compiled your new program (with the empty interface that I
mentioned) fine on AspectJ 1.6.7.  I also tried it with 1.6.6 and it
worked there too.

>ajc -1.5 MyAspect.java -showWeaveInfo

Extending interface set for type 'MyObject' (MyAspect.java) to include
'MyAspect$MyInterface' (MyAspect.java)

Type 'MyObject' (MyAspect.java) has intertyped method from 'MyAspect'
(MyAspect.java:'boolean
MyAspect$MyInterface.instanceOf(java.lang.Class<? extends
java.lang.Object>)')

Type 'MyAspect$MyInterface' (MyAspect.java) has intertyped method from
'MyAspect' (MyAspect.java:'boolean
MyAspect$MyInterface.instanceOf(java.lang.Class<? extends
java.lang.Object>)')

Your message:  "The method instanceOf(Class<Object>) from the type
MyObject refers to the missing type Object" sounds rather unusual.
Perhaps if you tell me precisely how you compile it, that will help?

Andy


2009/12/30 Michel Parisien <codingkriggs@xxxxxxxxx>:
> Thank you Andy,
>
> However, this does not work on my end. Let me paste the entirety of what I
> have in my toy example:
>
> public aspect MyAspect
> {
>     public interface MyInterface
>     {
>     }
>
>     declare parents: MyObject implements MyInterface;
>
>     public boolean MyInterface.instanceOf(Class<? extends Object> c)
>     {
>         return c.isInstance(this);
>     }
> }
>
> class MyObject
> {
> }
>
> class Main
> {
>     public static void main(String[] args)
>     {
>         new MyObject().instanceOf(MyObject.class);
>     }
> }
>
> I get, at the same place, a new error: "The method instanceOf(Class<Object>)
> from the type MyObject refers to the missing type Object". Notice that it is
> declared as Class<? extends Object> but during weaving becomes
> Class<Object>, and that's from where the error emerges in this case. Also
> notice I made a slight modification to the main, by passing instanceOf the
> value MyObject.class. I did this to show that simply changing the method
> argument's type from Class<? extends Object> to Class<Object> would not be
> sufficient to handle something other than Object.class.
>
> -Michel
>
>
> Andy Clement wrote:
>
> As a simple workaround until it is fixed, you can remove the
> declaration from the interface and just let the ITD do its work.
>
>
>
> public aspect MyAspect
> {
>   public interface MyInterface {}
>
>   declare parents: MyObject implements MyInterface;
>
>   public boolean MyInterface.instanceOf(Class<? extends Object> c)
>   {
>       return c.isInstance(this);
>   }
> }
>
>
> Andy
>
> 2009/12/30 Michel Parisien <codingkriggs@xxxxxxxxx>:
>
>
> I have to say, this was not the response I was hoping for. :) But thanks.
>
> The bug has been filed here:
> https://bugs.eclipse.org/bugs/show_bug.cgi?id=298665
>
> -Michel
>
>
> Andrew Eisenberg wrote:
>
> This does appear to be a bug with generics.  I am able to get your
> program to compile by removing the type parameters on your method
> declarations:
>
> public aspect MyAspect
> {
>   public interface MyInterface
>   {
>       public boolean instanceOf(Class c);
>   }
>
>   declare parents: MyObject implements MyInterface;
>
>   public boolean MyInterface.instanceOf(Class c)
>   {
>       return c.isInstance(this);
>   }
> }
>
> class MyObject
> {
> }
>
> class Main
> {
>   public static void main(String[] args)
>   {
>       new MyObject().instanceOf(Object.class);
>   }
> }
>
> I'd suggest that you raise a bug for this in bugzilla.
>
> On Tue, Dec 29, 2009 at 11:40 PM, Michel Parisien
> <codingkriggs@xxxxxxxxx> wrote:
>
>
> Hello,
>
> I have a problem that I tried boiling down to as small a code sample as
> possible. The following gives me the error "The method instanceOf(Class<?
> extends Object>) is ambiguous for the type MyObject" on the "instanceOf"
> method call in the main method:
>
> public aspect MyAspect
> {
>   public interface MyInterface
>   {
>       public boolean instanceOf(Class<? extends Object> c);
>   }
>
>   declare parents: MyObject implements MyInterface;
>
>   public boolean MyInterface.instanceOf(Class<? extends Object> c)
>   {
>       return c.isInstance(this);
>   }
> }
>
> class MyObject
> {
> }
>
> class Main
> {
>   public static void main(String[] args)
>   {
>       new MyObject().instanceOf(Object.class);
>   }
> }
>
> First, I wonder if this fails to compile for everyone or if it is just me.
> Second, since I suspect I may have a compatibility issue, here are my specs:
>
> * Mac OS X 10.4 Tiger
> * Eclipse Galileo
> * Mac OS X JavaVM 1.5.0 (J2SE-1.5)
> * AspectJ 1.6.6
>
> If the problem is with the code, I'd like to know the "better" way to
> accomplish the above.
>
> I would appreciate any help you could give,
>
> -Michel
>
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