MIDP version a J2ME class support

[playplay1978]

Hi,

I'm writing a API project which will be imported by other developer.

This project is CLDC-1.1 and MIDP-2.0.
How do I know which MIDP version is compatible with my API project? How do i know that?
Are there any other compatibility or versioning issues?

Thanks.

[r2j7]

Hello playplay1978,

are you targetting some specific devices with Java Runtime for running Java ME applications?

Nokia devices support CLDC 1.1 and MIDP 2.0 setup.

Furthermore, latest Nokia devices support CLDC 1.1 and MIDP 2.1 setup, and these are compatibile with the CLDC 1.1 and MIDP 2.0 (since MIDP 2.0 is the baseline for MIDP 2.1).

Regards,
r2j7

[playplay1978]

Hi.

At the moment, we are not targetting some specific devices with Java Runtime for running Java ME applications.

Well, based on what you explained, my sdk (CLDC-1.1 and MIDP-2.0.) can support up to MIDP-2.0 and app written with MIDP-2.1 can't use my SDK right?

Thanks.

[r2j7]

Well if one builds an application first with MIDP 2.1 and then tries to run it on a MIDP 2.0 based SDK emulator then in some SDK emulators there will be error prompts (like 'Invalid application' in Series 40).

Which SDK are you using?

Regards,
r2j7

[Tiger79]

"up to" isn't completely correct, simply because the combo CLDC 1.1 and MIDP 2.0 offers several features that the older platforms (CLDC 1.0 and MIDP 1.0) don't offer...
So the former platform is backwards compatible with the latter but the opposite isn't true...
For example CLDC 1.1 introuced floating point arithmetic, whilst only integer arithmetic was applicable on the CLDC 1.0 platform...
So take into account that code written for the older platfrom should run on the newer one, but if you write something for the newer one and you want to target older devices as well you might run into some trouble...

[playplay1978]

Hi r2j7,

The SDK is actually developed by me. Probably, i used the wrong term.

Hi Tiger79,
Yes. Thanks a lot. It should be from MIDP 2.0 and onwards.

[Tiger79]

oki well then you can target MIDP 2.0 and CLDC1.1 and it also should run on MIDP 2.1 devices...
Unless you actually need functionality from the MIDP 2.1 platform, which might mean that that specific extra functionality won't be running on MIDP 2.0 devices...