The standard Java API defines a number of useful and widely used interfaces, where the flow of methods invoked on objects must follow certain patterns to ensure their correct use. Typically, such patterns are informally specified in the documentation with several rules, which often do not cover full details, and are scattered throughout the whole documentation, since they usually involve more methods which are invoked subsequently. Failing to follow such rules causes a throw of IllegalStateException, or similar exceptions. Let us consider, for instance, the specification of the following types defined by the standard API of Java 10 in module java.base.