Actually, i want to review situation of behavior.

I have code:


import javafx.application.Application;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Pagination;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.util.Callback;

public class JavaApplication48 extends Application {

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage stage) throws Exception {
        VBox vb = new VBox();

        Pagination pg = new Pagination();
        pg.setPageCount(-5);
        pg.setPageFactory(new Callback<Integer, Node>() {

            @Override
            public Node call(Integer p) {
                System.out.println("Called for " + p);
                return null;
            }
        });

        vb.getChildren().addAll(pg);

        Scene scene = new Scene(vb, 300, 300);
        stage.setScene(scene);
        stage.show();
    }
}

When I run it, I have:
Called for 0

This looks like incorrect, because page count is less then 0, and control cannot ask for page in such case.

Also, click any of page navigation buttons (1, 2, 3, ...). I catch long exception:
at com.sun.javafx.scene.control.skin.PaginationSkin$NavigationControl$4.changed(PaginationSkin.java:801)
at com.sun.javafx.binding.ExpressionHelper$SingleChange.fireValueChangedEvent(ExpressionHelper.java:196)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:100)
at javafx.beans.property.IntegerPropertyBase.fireValueChangedEvent(IntegerPropertyBase.java:123)
at javafx.beans.property.IntegerPropertyBase.markInvalid(IntegerPropertyBase.java:130)
at javafx.beans.property.IntegerPropertyBase.set(IntegerPropertyBase.java:163)
at javafx.scene.control.Pagination.setCurrentPageIndex(Pagination.java:276)
at com.sun.javafx.scene.control.skin.PaginationSkin.createPage(PaginationSkin.java:355)
at com.sun.javafx.scene.control.skin.PaginationSkin.access$1900(PaginationSkin.java:84)
at com.sun.javafx.scene.control.skin.PaginationSkin$NavigationControl$4.changed(PaginationSkin.java:811)
at com.sun.javafx.scene.control.skin.PaginationSkin$NavigationControl$4.changed(PaginationSkin.java:801)
at com.sun.javafx.binding.ExpressionHelper$SingleChange.fireValueChangedEvent(ExpressionHelper.java:196)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:100)
at javafx.beans.property.IntegerPropertyBase.fireValueChangedEvent(IntegerPropertyBase.java:123)
at javafx.beans.property.IntegerPropertyBase.markInvalid(IntegerPropertyBase.java:130)
at javafx.beans.property.IntegerPropertyBase.set(IntegerPropertyBase.java:163)
at javafx.scene.control.Pagination.setCurrentPageIndex(Pagination.java:276)
at com.sun.javafx.scene.control.skin.PaginationSkin.createPage(PaginationSkin.java:355)
at com.sun.javafx.scene.control.skin.PaginationSkin.access$1900(PaginationSkin.java:84)
at com.sun.javafx.scene.control.skin.PaginationSkin$NavigationControl$4.changed(PaginationSkin.java:811)
at com.sun.javafx.scene.control.skin.PaginationSkin$NavigationControl$4.changed(PaginationSkin.java:801)
at com.sun.javafx.binding.ExpressionHelper$SingleChange.fireValueChangedEvent(ExpressionHelper.java:196)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:100)

Of cource, issue can be closed, if it is an expected behavior.