One question about developing J2ME in IntelliJ is that we cann't debug app. I have write an article about integrating Antenna with Ant to develop J2ME app in IntelliJ. The following is my steps.
1 download antenna,and add antenna's tasks to org/apache/tools/ant/taskdefs/defaults.properties in %IDEA_HOME%/lib/ant/ant.jar file,finally copy antenna-bin-0.9.12.jar to %IDEA_HOME%/lib/ant.
2 install WTK 2.1
3 start IntelliJ,and open the j2me project(attachment).
4 change the path of WTK_HOME in build.xml
5 run target of j2me_debug
6 start debug.
My English is not good,and I have write this article in Chinese,and you can find it on http://www.jetmaven.net/documents/p_ij_j2me_combination.php