I have some question about java and jvm on mobile devices
java app how works on mobile devices like Sony Ericsson or nokia s40 , ... ???
is any JVM or somthing like this on this devices for run java app ???
if there is no os on this devices how this jvm work ??? how it boot on device ???
Nokia supplies a CDC or CLDC JVM on many of their phones. I haven't checked Sony. Motorola has made a number of phones with built-in JVMs, I believe that the Razr is one of them.
Not all phones have built-in Java, however. In some cases, you can add one on, although typically it won't be able to interface as well with the phone hardware and internal databases (such as call history, context, GPS, and so forth).
An IDE is no substitute for an Intelligent Developer.
Another option for running Java apps on mobile phones in general these days is of course Android, which is making a lot more headway than JME nowadays. (Sony/Ericsson and Nokia in particular are more firmly in the JME camp, though, as is BlackBerry.)