The future of the Swing application framework on the Java 7 platform is undefined. http://weblogs.java.net/blog/archive/2009/08/19/saf-and-jdk7
Is it safely to use it now?
The future of the Swing application framework on the Java 7 platform is undefined. http://weblogs.java.net/blog/archive/2009/08/19/saf-and-jdk7
Is it safely to use it now?
The JDK 7 Features page says:
Dropped
JSR 296: Swing application framework
An API to define the basic structure of a typical Swing application, thereby eliminating lots of boilerplate code and providing a much-improved initial developer experience
So, this looks like it is definitively dropped for JDK 7.
However, that does not mean that you cannot use it or that it is in any way "not safe" to use it (whatever you mean exactly with that), neither that the project is dead and will not be developed any further.
Even though using SAF is fairly safe (cause it has nothing to do with JDK7), take a look at the following great alternative, created by developer, frustrated by slow progress of SAF