On December, 6th, Sony Ericsson released the J2ME SDK 2.1.5 for their telephones.
This suite of J2ME tools supports Java MIDP 1.0, MIDP 2.0, Java 3D API for the Sony Ericsson handsets. The SDK supports Java Micro3D (Mascot Capsule Ver 3 and JSR 184) emulation and includes all the necessary tools to support On Device Debugging for your applications.
This SDK requires Windows 2000/XP.