[joyhope]

I am using 4.2 JDE, and 4.1.0 7290 Handheld OS now.

I found I could got MemoPad application in simulator, but unable to run on 7290.

The problem is on Simulator:

net.rim.blackberry.api.pdap.BlackBerryMemo is available.

but in BlackBerry

net.rim.blackberry.api.pdap.BlackBerryMemo give me no class found.

Is the different cause by 4.2 and 4.1?

How could I known which classes is avaible in 4.1?

[Californium]

Yes that is probably a problem due to using the 4.2.0 JDE. I had a similar issue with playing mp3s.

You want to use the 4.1.0 JDE if you're planning to put the application on a handheld with OS 4.1.0. (Try to use the same version or older for the JDE. Newer versions seem to contain the classes and allow compilation and simulation but the depreciation of classes or something along those lines might have affected handheld operation)

[joyhope]

Thanks. I reinstall the 4.1 JDE again, and found some of the APIs is moved.

So I understand the JDE version should be the same as the device OS platform.

This is important for BlackBerry development.