get-superclass-and-interfaces-tree takes a Java class and returns of its superclasses and implemented interfaces. It is used by the importing interface to generate a tree which is then output as argument to ensure-lisp-classes-from-tree. It may be useful on its own, as a quick way of finding the tree for a class.
java-class must be a Java class, that is a jobject corresponding to a class. Typically that would be the result of find-java-class, but it can be the result of your calls to Java methods. Using the Java methods "getInterfaces", "getSuperclass" and "getName" in the Java class "java.lang.Class",
get-superclass-and-interfaces-tree constructs a complete tree of the superclasses and implemented interfaces of the class and its superclasses.
LispWorks User Guide and Reference Manual - 20 Sep 2017