java.lang.UnsatisfiedLinkError

[almoes]

Hi all!

I get this java exception: 'java.lang.UnsatisfiedLinkError, This object can only be invoked through an interface reference' when I try to access a method of a dll from my own dll. Any ideas? I don't understand because I can 'see' the methods of the dll, as they are defined as public. Is this a registry restriction? thanxs.

cheers,
alej

 

[stefanwagner]

Are you using jni?
dlls aren't common java libraries.

So you need to load them first, and references are tested at runtime.

I guess we need more details.

And you use 2 dlls? A own one and a second one?

 

[almoes]

Thanxs for the help, I discovered what it was. In j++ when accesing a COM class you need to make an instance of the interface of the class and not of the class itself. It doesn't give any compile errors and with other dlls I had done it the wrong way but it worked. Don't really know why it was working before, but at least I got the proper way now.

cheers,
alej

 

[stefanwagner]

So if you use j++, you should probably mention it on the Subject-line or at least in the text, because you know, j++ isn't java. It's c#--

 

[almoes]

Sorry for that, since I got the error message from the asp file where the dll is called I thought that it had nothing to do with j++. So then this 'must' of making an instance of the interface its just because I use j++?

cheers,
alej

 

[stefanwagner]

Maybe you could reproduce this error with java, but it's not very common to load dll-files.
Without knowing more details: which dlls are involved, how are the classes defined, ... I can not answer this, I have zero experience in j++.

 

[sedj]

J++ is actually not C#. It is a lanuguage which has syntax similar to Java, but is compiled into the .NET MSIL for use in the runtime CLR. Which admittedly, is similar to C#, but not the same.

 

[almoes]

Well...anyway I got the way for the moment thanxs to all

cheers,
alej