Is swingall.jar part of JDK1.2 (or higher)?

The Swing classes are a part of the standard classes that come with the Java 2 platform. There is no longer a need for delivering the Swing classes separately in swingall.jar as you did with Java 1.1. In fact, you can't deliver them separately. Its contents are now present in Java 2's rt.jar file, which is automatically read when running applications under the Java 2 Platform.

The swingall.jar file is specifically built for the Java 1.1 world, not taking advantage of new Java 2 capabilities, like security.