Finally got Java Midlets working

djengizz · 05-29-05, 05:43 AM

After a long time of trying different Virtual Machines i finally found a way to get Midlets running on my x50v.
Since i couldn't find a real howto on this i'll explain it in this post.

For a comparison on Java support for PDA's: click here.
To run MIDlets i use the IBM JVM. I haven't really used it for gaming yet but this should also work.
All generic MIDlets will run on this VM. So the example MIDlets from Sun (games like snake) and all MIDlets from midlet.org should run on this VM. More games can be founds on midlet.org.
Nokia MIDlets are a good example of non-generic MIDlets and will probabely not run on the IBM VM. Maybe on some of the other VM's but i don't have a lot of experience with them.

To install the IBM VM:
1. Go to the next link
2. Click on the link for the trial and navigate through the next three pages. (you'll have to login or register here)
3. On the third page scroll to "WebSphere Everyplace Micro Environment MIDP 2.0 for Windows Mobile 2003" and choose the download. (you don't need the "WebSphere Studio Device Developer")
4. Install (i installed in main)
5. Start MIDlet HQ on your PDA and point to a URL where your MIDlet runs. (Or open a MIDlet on your PDA)

This should do the trick - Good luck ;)

Don't expect too much from Java gaming on a PDA.
Imo you can better play games made for pocket pc or use the emulators like Morphgear / PocketSNES / etc.
The reason i want Java on my PDA is mainly to run my own programs.

palmdoc · 06-13-05, 01:08 AM

Thanks for the pointer. It says "trial" - does that mean the IBM Websphere times out?

djengizz · 06-13-05, 02:14 AM

Originally Posted by palmdoc

Thanks for the pointer. It says "trial" - does that mean the IBM Websphere times out?

No, the 'WebSphere Studio Device Developer' is a trial. The VM is not :)

palmdoc · 06-13-05, 07:40 AM

Thanks for the answer :) Btw I installed the VM into the BIS rather than Ram and it seems to work well.

Munk · 06-13-05, 04:43 PM

I installed mine straight onto my Compact Flash card on my x50v. It's working excellent and I'm so very thankful to you djengizz.

By the way, I thought I would just tell you my experience of putting the Brute Force hack with this IBM JVM.

In the "BIN" folder I Brute Forced the "Emulator.exe" first. What happens when you do that is that the "Midlet List" is in hi-resolution and hard to read because some of the list is below the "Start Menu" top menu-bar. The bottom buttons of "Launch", "Delete", etc are hidden as well. So, I removed the hack from this executable.

I then applied the Brute Force hack to the "J9midp20.exe" which makes the Midlet that you selected run in hi-resolution. The other benefit is that the program works MUCH FASTER. As a test I downloaded and ran a benchmarking midlet program called "Amark". Before Brute Forcing I ran at approximately 7 frames per second. After applying the patch, I went up to 58 frames per second!!! Wow. I also tried to apply the GAPI hack for the x50v but there is no difference in speed.

djengizz, once again thanks for the info and Im glad that you posted the method on how to do this. :approve:

Here is a link to the benchmark program:
http://midlet.org/category.jsp?parentLevel=245

djengizz · 06-14-05, 02:30 AM

Tnx for the info Munk. I'm gonna try this tonight.

djengizz · 06-15-05, 03:27 AM

Originally Posted by Munk

Before Brute Forcing I ran at approximately 7 frames per second. After applying the patch, I went up to 58 frames per second!!!

You're right. Same thing here: what a difference!
Can somebody explain this?

Spartacus · 12-06-05, 06:02 PM

Does this mean I can run the Azureous JAVA bitorrent client on my X50v?