Re: [Globalplatform-developers] Java card, JCRE and JCRMI

[Karsten O. <wid...@t-...>]

Hi,


  * Is it right? Can the JCRE invoke any method (in the API) of any
    applet (even if the applet doesn't implements the RMI interface)
    with the INVOKE APDU?
      o If it can't invoke those methods with the INVOKE APDU, can it
        invoke the methods with other APDU?

The JCRE is the runtime environment (RE!). It can do whatever it wants
with any applet, manipulate the byte code, the memory, everything. Of
course it can invoke also all methods. It can invoke it directly. It is
not necessary to use some external protocols. Like a Java Standard
edition can do it.


  * How can I send an APDU to the JCRE directly and not to the selected
    application?


AFAIR the JCRE offers some management functions like selecting an applet
and routing it. It can also act as the central command dispatcher. Maybe
also installation support is included. Look into the JCRE specification.
This should also answer all other questions.

  * Can someone please give me an example of the INVOKE APDU?

Never used it. Not sure it this technology is still alive.

BR,
Karsten

Am 06.03.2017 um 15:30 schrieb גל ברק:
> Hello everyone,
>
> I'm not sure if this is the right spot to ask to following question.
> If not it will be awesome if someone can redirect me to other mailing
> list or forum.
>
> AFAIK, most if not all of the UICC are Java cards. Therefore, it has
> JCRE and JCVM.
>
> According to the Oracle's Java Card Platform Specification it is
> possible to invoke methods remotely using the INVOKE APDU if the
> applet has a remote interface.
>
> But I read (I'm sorry I don't remember where) that the JCRE can invoke
> any method of the Java card API of any applet.
>
> So my questions are :
>
>   * Is it right? Can the JCRE invoke any method (in the API) of any
>     applet (even if the applet doesn't implements the RMI interface)
>     with the INVOKE APDU?
>       o If it can't invoke those methods with the INVOKE APDU, can it
>         invoke the methods with other APDU?
>   * How can I send an APDU to the JCRE directly and not to the
>     selected application?
>   * Can someone please give me an example of the INVOKE APDU?
>
> Thanks for the responders! :)
>
>
>
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