Attempts to record a click in a Java applet in an IBM Rational Robot script result in an abnormal end of the Java runtime environment.
The recorded script is similar to a script that record against standard Windows controls. The SQA Basic functions do not have a leading Java. For example, you see
Window action%, recMethod% parameter%
Where you expected
JavaWindow action%, recMethod% parameter%
You also see that the Java icon vanishes from the systray. You can continue recording after you restart the Java application manually.
All versions support Sun JRE 1.4.2 or older. Rational Robot will work on JRE 1.6 only for the existing controls. But your application uses JRE 1.6 specific new controls and not only the existing control of JRE 1.4.2. Therefore Rational Robot does not work with your application.
Resolving the problem
Consider to use another tool that does supports JREs newer than 1.4.2. An example is Rational Functional Tester.