SUN公司发布的Java ME无线开发工具，包括了一些列的工具集和模拟器。能够进行Java ME开发，但是没有提供源码编辑器，更多情况下需要和Netbeans等工具集成使用。WTK 2.5提供了对MSA的支持，包括如下JSR。Mobile Service Architecture (JSR 248) Java Technology for the Wireless Industry (JTWI) (JSR 185) Connected Limited Device Configuration (CLDC) 1.1 (JSR 139) Mobile Information Device Profile (MIDP) 2.0 (JSR 118) PDA Optional Packages for the J2ME Platform (JSR 75) Java APIs for Bluetooth (JSR 82) Mobile Media API (MMAPI) (JSR 135) J2ME Web Services Specification (JSR 172) Security and Trust Services API for J2ME (JSR 177) Location API for J2ME (JSR 179) SIP API for J2ME (JSR 180) Mobile 3D Graphics API for J2ME (JSR 184) Wireless Messaging API (WMA) 2.0 (JSR 205) Content Handler API (JSR 211) Scalable 2D Vector Graphics API for J2ME (JSR 226) Payment API (JSR 229) Advanced Multimedia Supplements (JSR 234) Mobile Internationalization API (JSR 238) Java Binding for the OpenGL(R) ES API (JSR 239) ……