Java: Project Reactor: Mono Question Mono's subscribe() Method? (Click to reveal answer) Answer Triggers the execution of a Mono pipeline. The subscribe() method in Mono is used to start the data processing pipeline. Without calling subscribe, the operations defined on a Mono are not executed. For example, subscribing to a Mono initiates the database query for the user. Additional NotesMono’s subscribe() Method? Track: Java Topic: Project Reactor Focus: Project Reactor: Mono Topics: Java Project Reactor Project Reactor: Mono