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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)