FULL PRODUCT VERSION :
java version "1.8.0_92"
Java(TM) SE Runtime Environment (build 1.8.0_92-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.92-b14, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 10.0.10586]

A DESCRIPTION OF THE PROBLEM :
Memory usage keeps increasing when there's a indeterminate ProgressBar or ProgressIndicator on scene. The moment the progressBar or ProgressIndicator is removed or set to a determinate value, the memory stops increasing.

Note: At some point ( Usually at 40MB ) the memory usage will go back to normal, but it will again keep increasing until it reaches this point again.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1) Create a JavaFX ProgressBar or ProgressIndicator
2) Set it to be indeterminate by calling "progress.setProgress(-1);"
3) Add it to the Scene, add the Scene to the Stage and display the Stage.
4) Monitor memory usage

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
For a basic application the beginning memory usage will be at 10MB. Once the ProgressBar or ProgressIndicator is set to indeterminate, it'll start rising at a pace of about 0.5MB per second. Once it reaches the point of about 40-45MB, it'll go back to normal, but continue to rise.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package xyz.spajk.java.memleak;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ProgressBar;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class ProgressLeak extends Application 
{
	// If set to true, RAM will be output to GUI instead of console
	public static boolean outputGUI = true;
	
	public static void main(String[] args)
	{
		launch(args);
	}
	
	@Override
	public void start(Stage primaryStage) throws Exception 
	{
		primaryStage.setTitle("ProgressBar memory leak");
		
		VBox root = new VBox();
		root.setAlignment(Pos.CENTER);
		root.setSpacing(10);
		
		ProgressBar progress = new ProgressBar();
		progress.setProgress(-1);
		
		Button changeButton = new Button("Change");
		changeButton.setOnAction(new EventHandler<ActionEvent>() {
		    @Override public void handle(ActionEvent e) {
		        if(progress.isIndeterminate())
		        {
		        	progress.setProgress(0.5);
		        }
		        else
		        {
		        	progress.setProgress(-1);
		        }
		    }
		});
		
		root.getChildren().addAll(progress, changeButton);
		
		Scene scene = new Scene(root, 710, 400);
		primaryStage.setScene(scene);
        
		primaryStage.show();
		
		Thread rammonitor = new Thread() {
			@Override
            public void run() {
				Runtime rt = Runtime.getRuntime();
				long usedKB = (rt.totalMemory() - rt.freeMemory()) / 1024;
				
            	System.out.println("Ram usage: " + usedKB);
            	
            	try {
					Thread.sleep(500);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}

            	run();
            }
		};
		rammonitor.start();
	}
}

---------- END SOURCE ----------