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PlayOnLinux 5: We want your opinion!

Tuesday 19 May 2015 at 22:17

Hi everybody!

As some of you have heard about it, we are seriously thinking about the future version of PlayOnLinux (a.k.a. PlayOnLinux 5.  The version 4 has a long history and the code contains stuff that makes it very hard to maintain. We really need to have a more stable version if we want to continue to give you the best. If we continue working on PlayOnLinux v4 we are assuming that:

  • PlayOnLinux will no longer have new features
  • PlayOnLinux may become completely broken one day

In this piece of news, I'm going to explain the option we prefer, why are we prefering it and also we are going to ask you if you agree or not.

Please read the whole article before complaining, trolling. It is a really important topic! Once you have read everything and you understand the problem, fell free to send comments and to vote.

As many of you may have heard, we are seriously thinking about switching from Python to Java. I perfectly understand some concerns and to be honest, I was the first to criticize Java even few months ago.

However there are several reasons that let us think that Java is the right choice for us:

  • Portability: We want PlayOnLinux to be accessible on Linux, FreeBSD, OpenBSD, Mac, ... and why not, being prepared to run on ARM/Android devices later.
  • Maintenability
    • Java do a lot of things to force developers to do things great
    • Java is statically typed. It is a lot easier to do simple task like refactoring, code-checking, ...
    • I have recently discovered the tools that exists Java to measure the code quality and the technical debt and to be honest, it is just impressive. You may have a look at this end of this news (SonarQube)
  • Contributions
    • We've noticed that there were hardly any contribution for PlayOnLinux v4 and we target to make some really infrastructure and guidelines so that everyone contribute. (See "infrastructure" paragraph at the end of this news)

PlayOnLinux is a lot more complex than just a GUI for wine. It is mainly a set of tools allowing you to write very powerful scripts. That is why it is a little more complicated than just a GUI for wine.

Responses to the main concerns

I don't want to install Oracle JDK or any closed program on my computer

We are going to guarantee you that PlayOnLinux v5 is compatible with OpenJDK JRE 8 (GPLv2)

PlayOnLinux will become very slow because Java is very slow

I can ensure you that this is wrong.

Java is a lot faster than Python in general (http://benchmarksgame.alioth.debian.org/u64q/python.html). Moreover, the v4 branch has a lot of non optimal code. The tests we have already done with Java is showing us than what we have developed so fare behave a lot faster that PlayOnLinux 4. To be honest, there is only one drawback: the JVM takes a little more time to start than the python interpreter.

You should have used QT! That makes more sense.

You may be right, but I'm talking about the language here, not about the graphical interface. So far, we've started to work with OpenJFX:

  • It is Open Source
  • It is customisable with some CSS
  • It supports GPU acceleration
  • We could support different skins for PlayOnLinux or imagine a Steam-Like interface. Everything is possible!
  • It is portable


  • It may not be fully integrated with your Desktop theme

However, the design of PlayOnLinux v5 perfectly allows to implement several user interface and let users chose the one they want. So it is perfectly possible to implement a QT interface with QTJambi for example: http://en.wikipedia.org/wiki/Qt_Jambi. (But it is not a priority. A command line interface is more important)

Java applications are ugly, not integrated to the system.

See the last paragraph

Java is insecure, there are so many security patches

The reason for that is that Java also has a "sandbox" mod which is often used to allow browser to execute some Java code without the approval of the user. This sandbox feature has been broken in the past, and is most intended for the browser plugin. We do not want to run PlayOnLinux on your web browser, so that's fine if you do not want to install the browser extension.


Proposal of a new design

A image is better to start. We plan to replace bash script with python scripts.

  • Python scripts will be directly run by Java (yes it is possible thanks to Jython!).
  • We are going to get a small part of PlayOnLinux v4 code just for backward compatibility (after some cleanup of course)
  • A lot of effort are going to be made to ensure the good quality of the code.


So you plan to run Wine inside Bash inside python inside Java :-O.

Of course not, that is where Jython comes. Jython is not using your system python at all! In fact it is a library that compile your python code into Java class on runtime. Basically, it means than it can just run your python script directly on the Java Virtual Machine without depending on Python. In fact, there will be less layer than there are today because the scripts will be able to execute Java codes directly without needing to create any sockets or other stuff like that.


Tasks that have already been done so far


We have set up two tools:


We have developed the following component as a proof of concept. If you agree with us, we are going to continue on that way to be able to propose you the best version of PlayOnLinux in the next few months.

  • PlayOnLinux core
    • Dependency injection
    • Unit test
  • PlayOnLinux core script management (all keywords are not yet implemented though)
    • PlayOnLinux Python script compatibility
    • PlayOnLinux Legacy (v4) script compatiblity
    • Script exemples
  • Install window (with remote downloading)
  • Other important stuff
    • GPG Script signature check
    • Complete wine registry parser (it means that you are going to be able to browse the registry with a very few line of script)
    • Wine management: Create a prefix with a progressbar, ...
    • Filesystem management (Copy with progressbar, download with progressbar)



So far, I'm pretty confident that this version can perform a lot better than v4.

  • The core we have is a lot faster
  • The scripts are smoother
  • We have a really clean code (for the moment at least)
  • We have a really clean infrastructure
  • Some external people have already shown interest in contributing to v5 code (by sending small patches)

However, I want to have your opinion about this choice. Please send the most comment as you can and talk freely. Please provide arguments with your commentary so that we can progress.

Now the time has come to comment! 

Fell free to comment here


Quentin PÂRIS


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