Relational routines allow you to check affirmations based on booleans.
To access these routines, double click on the Relational class under the system folder. The Relational class contains several routines, notably:
Checks if the variable provided is a null value.
To check a Relational Routine, you can use the ISNULL routine, along with a tJava component, for example:
String str = null; System.out.println(Relational.ISNULL(str));
In this example, the test result is displayed in the Run view: