IBM® Toolbox for Java™ switched to support Swing 1.1 in V4R5, and this release continues that support. Switching to Swing required programming changes in the IBM Toolbox for Java classes. So, if your programs use the Graphical Toolbox or the vaccess classes from releases before V4R5, you will need to change your programs as well.
In addition to a programming change, the Swing classes must be in the CLASSPATH when the program is run. The Swing classes are part of the Java 2 Platform. If you don't have the Java 2 Platform, you can download the Swing 1.1 classes from Sun Microsystems, Inc.