JavaFX Missing Features Survey: CSS

In the last post of the Missing Features Survey series I said that this post would be about missing features in CSS and FXML. Now it turns out that the survey submissions did not contain any valid FXML issues. So I will focus on CSS only.

These are the CSS features that were reported missing:

  • Full CSS support – some properties are simply missing in the current JavaFX CSS version, e.g. “fitToWidth” in ImageView. Also font inheritance is not working.
  • Support for CSS3.
  • CSS transitions – the ability to specify a transition right inside CSS. This would make it a whole lot easier to come up with nicely animated UIs.
  • CSS function hooks – just like in sass. The ability to define your own functions. Currently one can only use the built-in functions derive and ladder.

From the Oracle team I was told that all items could be done with support from the community and that they accept improvement requests and API proposals. So the wishes expressed in the survey are very much in line with what Oracle wants to do but they just don’t have the resources.

That’s it for today. Back to coding everyone!

JavaFX Missing Features Survey: Performance & Quality

I take it as a good sign that the categories “Performance” and “Quality” have not seen a lot of submissions in the “Missing Features Survey”.


In the survey the performance of JavaFX was compared with the performance of Swing and people noticed that JavaFX is slower than Swing. I personally have yet to find a use-case where that is true but I do believe that they can be found, however it should be noted that JavaFX also provides a much better coding experience based on a modern API and architecture. JavaFX supports property bindings and CSS styling. These things of course do take their toll on CPU time. Swing was designed for computer hardware that existed 20 years ago. JavaFX is targeting today’s hardware.

Something that I can agree on is that the use of huge quantities of more or less complex controls within a single stage does lead to performance issues. In a test case that was discussed by several JavaFX experts in Germany, Switzerland, and Austria we looked at the performance of JavaFX when displaying several thousand textfields. This does sound silly but there are use-cases out there that need to create this amount of controls. When comparing the time it took JavaFX to display the textfields to the time it took HTML to do the same we could clearly see that HTML can do it almost instantly while JavaFX needed several seconds. The culprit seems to be the code that performs the CSS styling. Somebody should take a closer look at it. This doesn’t have to be an Oracle employee. The code is open source and available to anybody!


The following items were mentioned related to quality:

  • WebView needs to be kept up-to-date with the current versions of WebKit
  • Image resizing needs to be improved to ensure that lines do not vanish when decreasing image sizes.
  • Better font rendering (all fonts on all devices).
  • Canvas rendering quality needs to be on par with scene graph rendering.

This is it for the topic “performance and quality”. Next blog will be about CSS and FXML.

Happy coding everyone!

New CalendarFX View: MonthGridView!

Me and my team have recently begun work on a new view for CalendarFX with the initial goal to display a whole year in vertical columns. The name of the view is MonthGridView. As usual the goal has changed slightly while coding. The view is now capable of displaying any number of months with extra months added in front or in the back. Now, for example, the developer can choose to display six months (a semester) with one month “padding” in front and one month in the back.

The following screenshot shows an entire year with no padding.

Screen Shot 2016-04-06 at 09.57.19

In planning and scheduling applications it is often the case that the person using the software wants to quickly compare the same weekdays with each other (e.g. “see resource utilisation on Mondays”). To make this easier the new view also supports a layout option where the same weekdays are aligned. It looks like this:

Screen Shot 2016-04-06 at 10.02.44

As mentioned above, the view can display any number of months with any number of “padding” months. The screenshot below shows a six month period with one month padding on each side (the styling of the extra months still needs some work :-))

Screen Shot 2016-04-06 at 10.14.13.png

The screenshots do not show any calendar information, yet. This part is still work in progress.

If you have any suggestions for features that you would like to see in this view then please leave a comment.


Shadow Fields vs. Property Accessor Interface

Carl Dea recently followed up on a blog post of mine called Save Memory! Use Shadow Fields for Properties. In his blog he suggested the use of an interface called “Property Accessor” to eliminate the heavy use of boilerplate code that is needed in order to use  shadow fields. Carl also mentioned that he hasn’t tested his approach with a lot of data and that he or some reader might follow up with a performance comparison. So here it comes.

I wrote a small test application that implements the three strategies that Carl mentions in his post:

  1. standard properties that are instantiated at the same time when the class gets instantiated
  2. property accessor interface as proposed by Carl
  3. shadow fields as proposed in my recent blog post

The code can be found on GitHub. (when you run it please make sure to set the initial and the maximum heap size to 2048 MB -ms2048m -mx2048m, otherwise the memory allocations will mess up the results).

The application allows the user to execute these strategies either with or without asking for the properties. It measures the time spent and the memory used. It should be noted that the measurements are not scientific as I used System.currentTimeInMillis() and Runtime.gc(). When run several times I would still argue that the qualitative value of these tests are acceptable.

The first screenshot below shows the numbers you get when you create between 1,000 and 2,000,000 instances of the Employee class that Carl used for his blog. The tests do not ask for the properties that are available on Employee (name, powers, supervisor, minions):


As you can see the “shadow field” strategy is the fastest and also uses the least amount of memory. This makes sense as the “standard properties” strategy always creates those fat property objects and the “property accessor interface” internally manages a hash map for each model object. Only the “shadow field” strategy works with a minimal amount of data structures. In the case of the selected test it saves a total of 230 MB. If you now imagine that typical applications have many model classes and many of those much more complex than the Employee test class then you can imagine how much memory you can save.

The next screenshot shows the measurements taken when also accessing all four properties and observables inside the Employee class.


Now the “standard properties” strategy is the fastest and also the one that uses the least amount of memory. Once again, this makes sense, as this strategy now implements the perfect approach for the given use case. However, the “shadow field” strategy comes in at a very close 2nd place.


The “Property Accessor Interface” strategy is successful at reducing  the noise created by all the boilerplate code needed for shadow fields but it comes at a price that I believe is too high to pay for any application that creates more than just a few model objects.



P.S.: it should be noted that the comparison is even more in favour of the “shadow fields” strategy when the initial heap size of the JVM is left at its default setting. In this case the test app has to keep asking for more heap space which is quite an expensive operation.

JavaFX Tip 23: Save Memory! Shadow Fields for Properties.

Properties and property bindings introduced in Java 8 are extremely useful programming concepts. They are especially useful when you are developing user interfaces. In fact they are so useful that developers have fallen victim to the idea that everything should be a property instead of a primitive. Unfortunately they easily forget that properties such as SimpleLongProperty are much bigger objects than standard types such as Long. And of course they are much bigger than primitive data types such as long.

In one of my current projects pretty much every model object used by the client is composed of properties. For many of these model objects it is the right approach because they will be edited / modified via JavaFX controls. But there are also many model objects that are not edited. They exist to support the rendering of schedules in the FlexGanttFX control. These objects do not need to be observed, hence they do not need to provide properties … but they do and they waste a lot of memory because they do.

One way to fix this would be to refactor the model classes and to get rid of all properties, but then again we might want to use these objects in a future release in a different context and then we might need properties because we want to edit them directly. What to do?

Shadow Fields

The solution to this problem is something I recently saw Gerrit Grunwald do in the code of his Medusa project and a pattern that was described by Mr. Properties himself Michael Heinrichs.  The pattern makes use of a “shadow field” that is of the same type as the wrapped object inside the property. When using this pattern a property will only be created when it is really needed (“when somebody asks for it”).


In this example we want to manage an attribute called “title”. We need a setter, a getter, and the property accessor.

private String _title = "Untitled"; // shadow field

private StringProperty title;

public final String getTitle() {
    return title == null ? _title : title.get();

public final void setTitle(String newTitle) {
    if (title == null) {
        _title = newTitle;
    } else {

public final StringProperty titleProperty() {
    if (title == null) {
        /// !!!! pass shadow field to constructor
        title = new SimpleStringProperty(this, "title", _title);  

    return title;

By using this pattern I was able to bring down the memory footprint from 310 MB to 250 MB for a specific use case in my project. The saved memory is ten times the total memory my computer had when I was a student. Just think about that!

CalendarFX 1.3 Released Today!

I have released a new version of CalendarFX today. Version 1.3 contains several small bug fixes, important memory leak fixes, and most importantly a big fix for correctly displaying different “first day of week” (e.g. Mondays in Germany, Sundays in the US). The new release can be downloaded as usual at Please take it for a spin and let me know what you think.

Bildschirmfoto 2016-03-20 um 13.31.54

CalendarFX is a UI framework for JavaFX 8. It contains several custom controls for visualizing standard calendar information (day, week, month, year view). CalendarFX is a commercial framework that is available for licensing.