After my post Developer's Top 10 replies when code doesn't work…, it occured to me why don't we now put together the top 10 replies for why Java ME apps stop working or misbehave… I have come up with 7 so far… Post your comments with your suggestions! At the end I will order them into Top 10 list/order; feel free to suggest your ordering for your entry:

10. That doesn't happen in the emulator...
9.  Hm, that optional package must not be supported on that device.
8.  It must the order of the MIDlet suite attributes.
7.  Uh? I swear the OK button was on the right side.
6.  Something's wrong with Samsung. It runs on Nokia. (from Khanh Le)
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1. The JAR file is too big for that handset.

ceo