Argument Type Mismatch Javafx . Javafx event argument type mismatch. Passing parameters between two javafx controllers i want to click a column and send the cell index to a new stage. Introduction to JavaFX Installation Guide CodersLegacy from coderslegacy.com The method setonaction(eventhandler) in the type buttonbase is not applicable for the arguments (new eventhandler(){}) bound mismatch: Some javafx classes define event handler properties, which provide a way to register event handlers. If you want coercion to.