FlexGanttFX 1.4.0 Released!

I am very happy to announce that I have released version 1.4.0 of FlexGanttFX for JavaFX. This release contains bug fixes and small improvements. I am glad to say that FlexGanttFX has proven itself in the field and is operational in various large enterprise applications. Some of its more prominent users are:

  • Emirates Airlines
  • European Broadcasting Union
  • Airbus
  • PSI Poland

The following are a couple of screenshots from these applications.


PSI Poland

Bildschirmfoto 2015-12-19 um 12.28.15

European Broadcasting Union


Emirates Airlines


MINT Software Systems


JavaFX “Missing Features” Survey Results

I recently conducted a survey asking the community to tell me which features they are missing the most in JavaFX 8. The survey has been closed by now. It received over 100 submissions from various people, various companies, various industries. Overall the participants very quite satisfied with JavaFX so I would argue that the feedback was submitted by people who really care about the platform and would like to see it evolve over time.

The following chart shows the exact distribution of the answers given by the participants when asked how satisfied they were with JavaFX.

Bildschirmfoto 2016-01-25 um 20.04.45

Categories / Issue Areas

The feature requests can be roughly grouped into these categories:

  • Table View
  • Performance
  • Quality
  • Properties
  • CSS & FXML
  • OpenGL & 3D
  • Media
  • Missing Controls
  • Missing API
  • Other

I will try to create a blog for each one of these categories over the next couple of weeks. So stay tuned!

JavaFX Real-World Apps: PSI Advanced Scheduling and Monitoring

I am happy to announce that there is a new entry for the “Real-World Apps” list. The company PSI has developed an application for “advanced scheduling and monitoring”.


The software will be used by the manufacturing industry. The screenshots look quite polished and attractive. PSI is one of the earliest adopters of FlexGanttFX, my JavaFX framework for visualizing schedules of any kind.


PSI – Operation Gantt


PSI – Operation Detail


PSI – Production Order


PSI – Report


PSI – Structural Gantt

As usual I have done an interview with the developers. Michal Bocian (Development Manager) and Dobieslaw Chabrzyk (MES Product Manager) of PSI were kind enough to provide the answers.

General Questions

What is the name of your product / project?

PSI Advanced Scheduling and Monitoring

Who are your users / customers?

Customers: manufacturing industry in following areas:

  • Serial production
  • Metal re-working
  • Made-to-order constructions


  • Production schedulers
  • Shop floor stuff
  • Production managers

What is the purpose of your software? What are its benefits?


  • Scheduling and execution monitoring of production process


  • Reduce manufacturing costs
  • Reduce work in process
  • Improve customer service
  • Lower implementation and maintenance costs compared to existing IT solutions

Is the application operational? If yes, since when. If not when do you plan to go live?

Official go to market is planned for April 2016.

How big is the budget for your project?

A few hundred thousand euros.


How did you get the necessary JavaFX Know-How into your team? (Consultants, Internal / External training courses)?

Mostly from the Internet (StackOverflow, Official APIs etc).

With which version of JavaFX did you start? 1, 2, 8?

JavaFX 8.

When did you start developing the application and how long did it take?

We started the development around April 2014. The development lasts till now.

How many developers worked on it? In total and on the UI.

We have 5 developers working on both server and client side.
We have 1 developer who is adjusting our CSS.

How big is the application? Lines of code, Number of classes.

230,000 Lines of Code, 2000 Classes.

How big is the JavaFX client? Lines of code, Number of classes.

190,000 Lines of Code, 1600 Classes.

Why did you choose JavaFX as frontend technology? And very importantly: why did you not choose HTML / Web?

PSI is specialized in creating applications based on the Java platform. JavaFX is the natural successor of Swing. We were considering HTML / Web for the frontend – but because of limited performance we had to give up for now. Our application needs to hold about 500,000 complex domain objects in memory to perform extraordinary parallel calculations on them.

Was it difficult to convince decision makers to agree on JavaFX?

No, it was easy. Our company is specialized in Java technology – especially in Swing. JavaFX is the choice for company like ours.

What were the biggest challenges / problems / issues / bugs you faced in the JavaFX part and how did you solve them?

We’ve found some bugs in JavaFX but none of them were critical nor major. We reported them on JavaFX’s bugtracker, and we are waiting for the fixes. Meanwhile we did some temporary workarounds.

Which 3rd-party products / frameworks / tools (open source and commercial) did you use and why did you choose them?

  • FlexGanttFX – because of modularity, quality and performance.
  • Eclipse E4 – because of window manager and dependency injection.

Did you mix JavaFX and Swing code?

We’ve tried it once, but we had to give up. It is stable when used in static layouts, but when the user tries to perform complex interactions with the UI, many unusual bugs take place.


Would you use JavaFX again for your next project? Please elaborate why or why not.

In our case JavaFX was the only choice we had. Our application needs a lot of memory and it has to be multithreaded. If you combine these two requirements with the server written in JavaEE – JavaFX is the only choice. If our application had different non-functional requirements we would probably create our application in HTML/Web.

Which recommendations do you have related to JavaFX for other companies / projects?

If you consider JavaFX as your potential platform, check if all the special and non-standard UI requirements are meet.

Which features would you like to see being added to JavaFX?

At the moment we are suffering from a lack of good date and time picker.

Do you plan to provide a mobile version of your application or a mobile addition?

Yes, but since our product needs a lot of resources, we plan to deliver simplified application (e.g. without interactive Gantt chart).

JavaFX Real-World Playlist

I finally found some time to create a YouTube playlist with all the “Real-World” JavaFX applications that Alexander Casall and I presented at JavaOne 2015. Maybe you can find some inspiration.

The videos show the following applications:

  • EIZO – Curator Caliop
  • Emirates Airlines – Network Capacity Optimization
  • AISO – HRC-Matic Business Registry
  • European Broadcasting Union – NEOS
  • MINT Software Systems – Training and Resource Management (TRMS)


JavaFX: The Power of CSS

I recently presented the NEOS application that was developed for the European Broadcasting Union. Now that a few weeks have passed the UI has been polished and a lot of work was invested into styling it via the CSS support of JavaFX. I really like the results and thought it would be good to show you.


Bildschirmfoto 2015-12-19 um 12.28.15

Editing a Transmission

Bildschirmfoto 2015-12-19 um 12.36.12

Searching for Transmissions

Bildschirmfoto 2015-12-19 um 12.28.54

Editing a Resource



JavaFX Tip 22: Autosize (Tree) Table Columns

One of the first things mentioned as a “missing feature” in the JavaFX “Missing Features Survey” was the ability to auto-resize columns in tables / tree tables. It is correct that there is no public API for it, but when you pay close attention then you will notice that there must be code for doing this somewhere inside JavaFX, because the user can auto-resize a column by double clicking on the divider line between the column and the next column to the right.

But like most people I felt that this was not good enough for my code. I wanted an API for FlexGanttFX that would allow the user to auto resize one or all columns inside the Gantt charts. So I searched for the code that was hidden somewhere in the tree table  or tree table skin (can’t actually remember where) and reused it with some minor modifications in my classes.

The following is the result of this work. It targets the TreeTableView and not the TableView, but making it work for the standard table is straight-forward. Simply replace all TreeTableColumn occurrences with TableColumn. Please notice that resizing all rows can have a serious performance impact, so you might have to limit the number of rows that will be considered for the calculations via the maxRows parameter.

	 * This method will resize all columns in the tree table view to ensure that
	 * the content of all cells will be completely visible. Note: this is a very
	 * expensive operation and should only be used when the number of rows is
	 * small.
	 * @see #resizeColumn(TreeTableColumn, int)
	public final void resizeColumns() {

	 * This method will resize all columns in the tree table view to ensure that
	 * the content of all cells will be completely visible. Note: this is a very
	 * expensive operation and should only be used with a small number of rows.
	 * @param maxRows
	 *            the maximum number of rows that will be considered for the
	 *            width calculations
	 * @see #resizeColumn(TreeTableColumn, int)
	public final void resizeColumns(int maxRows) {
		for (TreeTableColumn<R, ?> column : getTreeTable().getColumns()) {
			resizeColumn(column, maxRows);

	 * This method will resize the given column in the tree table view to ensure
	 * that the content of the column cells will be completely visible. Note:
	 * this is a very expensive operation and should only be used when the
	 * number of rows is small.
	 * @see #resizeColumn(TreeTableColumn, int)
	public final void resizeColumn(TreeTableColumn<R, ?> column) {
		resizeColumn(column, -1);

	 * This method will resize the given column in the tree table view to ensure
	 * that the content of the column cells will be completely visible. Note:
	 * this is a very expensive operation and should only be used when the
	 * number of rows is small.
	 * @see #resizeColumn(TreeTableColumn, int)
	public final void resizeColumn(TreeTableColumn<R, ?> tc, int maxRows) {
		final TreeTableColumn col = tc;

		List<?> items = getItems();
		if (items == null || items.isEmpty()) {

		Callback cellFactory = tc.getCellFactory();
		if (cellFactory == null) {

		TreeTableCell<R, ?> cell = (TreeTableCell<R, ?>) cellFactory.call(tc);
		if (cell == null) {

		// set this property to tell the TableCell we want to know its actual
		// preferred width, not the width of the associated TableColumnBase
		cell.getProperties().put("deferToParentPrefWidth", Boolean.TRUE); //$NON-NLS-1$

		// determine cell padding
		double padding = 10;
		Node n = cell.getSkin() == null ? null : cell.getSkin().getNode();
		if (n instanceof Region) {
			Region r = (Region) n;
			padding = r.snappedLeftInset() + r.snappedRightInset();

		TreeTableRow<R> treeTableRow = new TreeTableRow<>();

		int rows = maxRows == -1 ? items.size()
				: Math.min(items.size(), maxRows);
		double maxWidth = 0;
		for (int row = 0; row < rows; row++) {


			if ((cell.getText() != null && !cell.getText().isEmpty())
					|| cell.getGraphic() != null) {

				double w = cell.prefWidth(-1);

				maxWidth = Math.max(maxWidth, w);

		// dispose of the cell to prevent it retaining listeners (see RT-31015)

		// RT-23486
		double widthMax = maxWidth + padding;
		if (treeTableView
				.getColumnResizePolicy() == TreeTableView.CONSTRAINED_RESIZE_POLICY) {
			widthMax = Math.max(widthMax, tc.getWidth());


Survey: JavaFX 8 Missing Features


One sentence that I hear quite frequently when discussing JavaFX with other developers is that JavaFX “does not do XYZ” or “does not support XYZ”. Often they list features that are indeed available in other technologies / frameworks. To get a better understanding of these “missing features” I thought it would be good to create an online survey and to collect them. Ideally we end up with a complete list and ideally we have the perfect UI framework if we can check off every single item on the list. 🙂

Bildschirmfoto 2015-12-10 um 16.34.11

Cool: JavaFX in the Browser!

I had a nice long talk today with the guys from Sandec (sandec.de). They were showing me their product called “Centralized Java (CJ)”. With this solution it is actually possible to run a JavaFX application in a browser (for now it works best with Chrome).

The website javafx-samples.com shows several demos that are using this technology. The demos include the JavaFX SceneBuilder, the game 2048, the JavaFX Ensemble demo suite. It is amazing how much of these applications is supported by CJ. There are still a few gaps but the folks at Sandec are planning to close them soon.


CalendarFX running inside Chrome

CJ hosts the application on the server and serializes the JavaFX scene graph. The graph is then sent to the browser and recreated by JavaScript. So you basically end up with a JavaScript rendering engine for JavaFX. Very cool!

CJ even supports a mode called “MultiView”. With this it is possible to share a session with several people, very similar to (for example) TeamViewer.

CJ is one step more for fulfilling the vision that the same code base can be used for any client.

Edit: I have uploaded a video to YouTube showing CalendarFX running in Chrome.


JavaFX is Here to Stay!

The last week has seen some discussion on the web related to the future of JavaFX. Many people got the impression that JavaFX will be put on ice by Oracle. This was primarily caused by a blog post written by Shai Almog (Codename One) called “Should Oracle Spring Clean JavaFX”. It was  “inspired” by a blog that I had written a little bit earlier where I was emphasizing the benefits of JavaFX.

I believe that Shai simply tried to emphasize that Oracle could do more / could do better when it comes to JavaFX but the conclusion that some companies were drawing after reading it was that JavaFX is dead. This is simply not true.

Oracle’s Commitment

I have asked on the openjfx mailing list today for a statement from Oracle and Donald Smith was kind enough to reply. Donald is a Senior Director of Product Management at Oracle Corporation:

Oracle is still committed to JavaFX and it will still be around for a while.

As of 7u6 we bundled JavaFX with the Oracle JDK, we’ve open sourced 100% of the code, we continue developing for it, etc. I understand that
while there is both Swing and JavaFX available that people will continue to question the existence of each — so be it. Each has it’s own niches and benefits and our strategy, as it has been for years now, is to continue with each.

– Don

Built Into JavaSE

JavaFX is part of JavaSE. This means that it is a core component of Java and that it will be installed wherever Java is installed. If I remember correctly then no API has ever been actually removed from Java, so why would anyone think that this will happen with JavaFX?

I received an email today from Shai where he is confirming this, too.

Once something is classified as a “product” (as JavaFX is) its there for the next 20 years.


JavaFX is here to stay and it is a great piece of technology if you want to implement a desktop client (fat / rich client). I have personally worked on several JavaFX projects for the last two years and I have seen my own JavaFX frameworks being used by others. So far each one of these projects has been a big success and JavaFX was able to equally convince the developers and the end users. It might not be ready for prime-time on mobile or embedded devices, yet,  but with the current activities in these areas it might eventually become a major player there, too.