Re: Cannot create an instance of Location.Criteria class - lapi.jar MIDP 2.0 J2ME

On Fri, 01 Apr 2005 21:47:10 +0100, Roland <roland.weiersmueller@xxxxxxx> wrote:

Hello

I am trying to find out the good provider for a kind of GPS program
written with j2me midp 2.0 using the location API (lapi.jar) and
Eclipse development environment with the plugin 'eclipseME'.

I have a very strange phenomena.
I try to create an instance of the Criteria class which is part of the
Location API (lapi.jar).

I can compile it without any problems, the program crashes at runtime.
My programm crashes with the following error line:
java.lang.NoClassDefFoundError: javax/microedition/location/Criteria
The lapi.jar is included in the project and the Criteria class exists.


Looks like a classpath problem, is the lapi.jar included in the classpath when you run your app? Are you running on an emulator or an actual device? You need to configure your emulator or the manifest in your app's jar file to include lapi.jar in the classapth.

OK, that's my token attempt to answer your question ;) the real reason I replied is because I'm interested in which device(s) are you planning to run on? We've been looking at JSR-179 (the J2ME location API) and it seems to be almost universally unsupported by current generation mobile phones. It seems to require both CDLC 1.1 for floating point support and vendor support for the location API on the device (I may be wrong, my colleagues have looked at this in more detail than I have personally). I presume you are using some kind of reference implementation in an emulator? We are targeting Symbian devices and are having to use C++ to retrieve location information because of the lack of JSR-179 support. I'd be very interested if you've got it working just with Java.

Dan.


P.S.  Anybody else think there should be a comp.lang.java.mobile group?

--
Daniel Dyer
http://www.footballpredictions.net
.