ikvm-developers

[Ikvm-developers] Return type of java.lang.Class.getGenericSuperclass()

[Yevgen K. <eug...@we...>]

Hi all,
 
after 4 month of successfully using IKVM under .NET i got the first problem (generics):
First i define in java a generic class
  
  class BaseClass<T extends MyType> {...}
 
and then the class
  
  class ChildClass extends Baseclass<MyType1> {..}, where MyType1 extends MyType.
 
The compiled classes are loaded using the URLClassLoader and then i try to get some information about the class type 
(actually i need the name of the type parameter (MyType1) used in the declaration of ChildClass):
 
  java.lang.reflect.Type t = clazz.getGenericSuperclass(); //clazz is the loaded ChildClass
  ParameterizedType pt=(ParameterizedType)t;  //after this cast the value of pt is null
 
The last line is working fine with the sun JDK but with IKVM the value of pt is null. 
 
I far as i can see, the difference is, that the sun-Implementation of 
getGenericSuperclass() returns a ParameterizedTypeImpl (which has a Field "rawType" containing the raw type "BaseClass") and usng IKVM the same method
returns the raw type (BaseClass) instead of ParameterizedTypeImpl, which is the reason for pt to be null after the casting.
 
Do you have any idea of what is happening / what should i do to get the information about the type parameter?
 
Thanks in advance,
Yevgen
 		 	   		  

Re: [Ikvm-developers] Return type of java.lang.Class.getGenericSuperclass()

[Jeroen F. <je...@su...>]

Hi,

What version of IKVM are you using? Do you have a repro?

Regards,
Jeroen

> -----Original Message-----
> From: Yevgen Kogan [mailto:eug...@we...]
> Sent: Tuesday, November 30, 2010 1:05 PM
> To: ikv...@li...
> Subject: [Ikvm-developers] Return type of
> java.lang.Class.getGenericSuperclass()
> 
> Hi all,
> 
> after 4 month of successfully using IKVM under .NET i got the first
> problem (generics):
> First i define in java a generic class
> 
>   class BaseClass<T extends MyType> {...}
> 
> and then the class
> 
>   class ChildClass extends Baseclass<MyType1> {..}, where MyType1
> extends MyType.
> 
> The compiled classes are loaded using the URLClassLoader and then i try
> to get some information about the class type (actually i need the name
> of the type parameter (MyType1) used in the declaration of ChildClass):
> 
>   java.lang.reflect.Type t = clazz.getGenericSuperclass(); //clazz is
> the loaded ChildClass
>   ParameterizedType pt=(ParameterizedType)t;  //after this cast the
> value of pt is null
> 
> The last line is working fine with the sun JDK but with IKVM the value
> of pt is null.
> 
> I far as i can see, the difference is, that the sun-Implementation of
> getGenericSuperclass() returns a ParameterizedTypeImpl (which has a
> Field "rawType" containing the raw type "BaseClass") and usng IKVM the
> same method returns the raw type (BaseClass) instead of
> ParameterizedTypeImpl, which is the reason for pt to be null after the
> casting.
> 
> Do you have any idea of what is happening / what should i do to get the
> information about the type parameter?
> 
> Thanks in advance,
> Yevgen