Sun Microsystems 發布了 Java Platform, Standard Edition 6 (Java SE 6)
的Beta版本。也就是Mustang的Beta版本。"相信這個版本在功能及易用性上應該有不小的改進。"
Sun發言人提到,通過擴展對腳本語言以及web service的支持，Java SE 6已經成為了下一代WEB
2.0應用的平臺，現在我們發布Beta版本，讓廣大開發者進行測試。” Jeff Jackson
提到。“同時希望開發者們盡早測試，并將bug反饋給我們”。
Java SE 6支持JAX-WS 2.0 和 JAXB 2.0，提供對程序進行監測和管理的工具，提供對DTrace的擴展支持。
同時SUN提到：Java SE6對桌面程序的效率將有顯著的提高，這無疑是非常讓人期待的。"希望所謂的SE6的桌面程序不是在炒作而已，必盡桌面MS是老大。不過Mustang的新特性還是很值得我們期待的，等下載測試后再發表意見！下載(Java SE 6)Beta版在here

New Security features and enhancements:
1. Native platform GSS/Kerberos integration
2. Java Authentication and Authorization Service (JAAS) login module that employs LDAP authentication
3. New Smart Card I/O API
Integrated Web Services:
1.    New API for XML digital signature services for secure web services
2.    New Client and Core Java Architecture for XML-Web Services (JAX-WS) 2.0 APIs
3.    New support for Java Architecture for XML Binding (JAXB) 2.0
Enhanced Management & Serviceability:
1. Improved JMX Monitoring API
2. Runtime Support for dTrace (Solaris 10 and future Solaris OS releases only)
3. New custom deployment facilities
Increased Developer Productivity:
1. Improved memory usage analysis and leak detection
2. Significant library improvements
3. Improvements to the Java Platform Debug Architecture (JPDA) & JVM Tool Interface
Improved User Experience:
1. Look and feel updates to better match underlying platforms
2. Improved desktop performance and integration
3. Enhanced internationalization support