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How to run existing JAVA Web start application in java 10 or later java 11

My application is developed in java Swings which is 20 years old. For this huge application we are migrating the same on JAVA 10 now and will migrate the same on java 11 or upcoming versions. This application is working fine with java Webstart and as per the java 11 features, java Web Start application will not be supported in java 11 and other coming versions.
Please let me know the best way to run my application on java 10 with out webstart.

There is OpenWebStart start project. It says:
we decided to create OpenWebStart, an open source reimplementation of
the Java Web Start technology. Our replacement will provide the most
commonly used features of Java Web Start and the JNLP standard, so
that your customers can continue using applications based on Java Web
Start and JNLP without any change.
At the moment the project is alpha phase. Download is available. Beta should be available by the end of the year:
Our goal is to have beta tests and a release candidate ready in
Q3/2019

One solution might be the WebStart replacement that Karakun is currently working on: https://dev.karakun.com/webstart/
Currently it is not clear when and how this will come since it is based on a kind of crowd-founding but since everyone can get involved (even with low cost) this is a very good possibility.
Since this is a duplicate of Applet/JNLP on Java 11 migration I just copied my answer

Use Getdown which is a system for deploying Java applications to end-user computers, as well as keeping those applications up to date.
It was designed as a replacement for Java Web Start due to limitations in Java Web Start's.
You can read more on https://github.com/threerings/getdown

You will have to find an alternative technology to JWS/JNLP to run your system, as JWS/JNLP will no longer be available.
I don't have a clear cut alternative, the few companies still using JWS tend to be working to develop their own replacements for internal use.
I know this may not be what you want to hear (that there is no out of the box replacement available) but that's the way it is. Project I'm working on is in a similar conundrum, we also have several JWS components that will need to be reworked in the near future.

Handling specific Java version for desktop application

What is the best way to handle situation, when a Java desktop application (executable JAR) requires specific (or newer) version/update of Java, to not get some NoClassDef exceptions?
Details: I have JavaFX 8 desktop application, build with Maven and com.zenjava.javafx-maven-plugin to executable JAR. I'm using new features of JDK 8u40. I would like to nicely handle situation, when someone is trying to run it with older Java version.
First, most low-end approach is to check
System.getProperty("java.version");
at the start of main function, parse it with a couple of "ifs" to extract is it major >= 8 and update >= 40, if not show some popup instead of app. But it seems to me like mediocre solution.
I wonder are there better ways? I'd love to know more about direct code solutions, external libs, additional jar launchers or Maven options for this purpose.
Edit: additional info - I would like to avoid platform-specific solutions

The solution which mostly works: just create a native bunde with included JRE. This is the default when calling mvn jfx:native, so you shouldn't worry about the class being there, because you bundled that specific version.
That is the main reason why some are using that option. Just imagine the situation you are require Java 8 but the user just uses Java 7 and so on, it makes the bundle bigger, indeed, but it preserves you from such problems.
Disclaimer: I'm the maintainer of the javafx-maven-plugin, there are example-projects ;) but no cookies yet.

How to make a browser based IDE to code in the cloud?

I have read a bit about cloud and browser based IDE's.
I am planning to make a Java based bare bones IDE by integrating a compiler to code in the cloud. This is for educational purpose as I am just determined to learn to develop cloud based IDE.
I want it to be something like eclipse Orion but i want it to allow for coding in java. It should allow users to code, compile and run java programs by directly writing .java files and not by converting the .js files into java files.
Can someone please suggest me an existing cloud that I should use for this. And also, I am just a beginner and I have no clue about how to proceed and the articles that I am required to read.
Please do let me know what I should begin with and the cloud that suits my needs the best.
Thank you very much in advance.

You should look at projects like Mozilla SkyWriter, which implement the bare bones editing functionality
(There have been a lot of change lately. There seems to have been migrated to Ace)

You can use Codenvy and put your code on a Git repository. Then, you could build automatically once you have done the push using a CI tool like Jenkins. Now, I have an environment in which I use a Jenkins instance as a Service and also a runtime environment so I can get a continuous deployment pipeline. This video will show you, in a graphical way, what I am talking about.

Koding provides you with a full Ubuntu machine, with root, so it's able to run and do what you want, programming wise.
The reason i'm suggesting Koding though, is that they have a Framework to develop your IDE for the Koding VMs themselves.
The logic here, is that making IDEs is challenging, but the biggest challenges is ensuring security between your IDE users. Using another VM platform would mean that you don't have to manage the security of your VM, and focus entirely on your IDE.
Let me know what you think :)

For virtual/cloud hosting try one of the following:
Rackspace
VPS Farm
I like vpsfarm because it is cheap and pretty bare bones.
For the IDE itself, I would first create a webapp that can upload and compile and run arbitrary java code, without adding libraries or J2EE. That alone will be a good undertaking for one dev.

How to distribute Java-based software?

Now, don't get me wrong, I am a very competent programmer, but when I program, I typically develop things for the web using scripting languages like JavaScript, PHP, Python, SQL, etc. If I want to develop Java software (I am relatively experienced in Java), how do I distribute it?
Is there any good way to package up Java software in a nice little executable, send it out, and have it run? Alternatively, is there any good way to package up Java in some sort of installer, and send it out to be installed and run?

I'm using Launch4J http://launch4j.sourceforge.net/ it will generate an .exe executable for Windows, if the targeted system don't have JVM, it will tell user to download and get JVM.

You can package Java applications in so called jar-files using the jar tool or any competent Java IDE. These jar-files are self-contained and seldom need any installer.
These .jar files can easily be distributed and executed.
If you're used to web-development, you may also be interested in the Java Webstart technology.
Some links to get you started.
Export to a .jar-file in Eclipse
Lesson: Java Webstart

I have found two approaches to work well, depending on the needs of the end user.
1) Java WebStart - allows for central distribution and easy maintenance, but works best for online users. Require you to have a web site to locate the files - these days this is easy to do on the Google Application Engine.
2) Wrapping up the Java program in a single jar using one-jar, and then using jsmooth to generate an .EXE file which ensures Java is available, extracts the jar-file and invokes Java on it. This works well for users not always on the net, where you want the launch process to be transparent, but is less easy to upgrade than the webstart approach.

I use Maven to handle all the dependencies of my projects and that way when you utilise Maven to build your projects they will compile into one nice executable jar that contains everything so you dont need to worry about getting all your third-party jars in the right place etc.

There are a couple of ways: one is to create an installer that allows your user to install and run it. For this you can take a look at NSIS.... or you can just use Java Web Start where your user can just click the link and launch your application.

Here you will find a large set of options: Open Source Installers Generators in JavaIt is very useful for the "naive" customer or user of your application, to make the installation process as painless as possible. Let them install whatever is needed, DBMS, JVM, JMF and additional options via one installer.

You can also consider use one of the rich client platforms available for Java. The learning curve is probably a lot higher than just creating a jar file and ship it, but you will get a lot for free when it comes to distribution. (Think Eclipse with auto update through an update site).
Do a search for "Eclipse RCP" and "Netbeans RCP" and you'll find the two biggest contenders here. I also performed a serach for "eclipse RCP installer" and one of the hits seems interesting:
http://download.instantiations.com/RCPPackagerDoc/integration/latest/docs/html/gettingstarted/GenInstaller.html

I personally like izpack. It generates a jar file installer that you could wrap up in launch4j, supports things like windows specific shortcuts, is highly customisable through XML and hooks directly into ant.
OneJar is great for smaller stuff, but for larger programs or applications it's nowhere near as flexible and in my experience is rather slow.

Hello you can make an installer for your application.
In the link below you will find a nice help about izpack installer.
http://www.imrantariq.com/blog/?p=89
Link below contains a detailed pdf to make installer with izpack.
http://www.imrantariq.com/blog/?attachment_id=112
cheers

Simple cross platform GUI app

I would like to know if there is any way that I could build a very simple GUI app (it doesn't even have to look good) that will run on a fresh install of Windows Vista and OS X with no other installations needed by the user. I would perfer not to use Java (just out of personal programming preference). I will use it though, if it is the only way. Specically, I am wondering if I can write a swing app with Scala or Groovy and run in on windows without them having to install anything. Sorry if this is a silly question, I am a Obj-C developer by trade.

You can pack the Scala jars into your own, which should work as long as Java is installed (which it usually is on a 3rd party vendor install of Vista or OS X). If you use Java web start, no installations are needed beyond Java itself. Plus, if you're going to install your own code, why not just copy along the Scala jars also?
If you really mean a fresh install--nothing but what the OS provides--then no, I don't think so.
Edit: You do always have javascript on the browser(s). I assume this won't cut it for what you want?

If you really, really don't want to install anything (or carry anything in your app), then write the application as a web app (possibly a javascript app). Then any user can run that UI from any machine with a decent browser. But then, this will require that you host the app somewhere.
If that is not an option, you can develop your app to as a single html/xhtml file containing a self-contained, self-modifiable javascript application (like TiddlyWiki which I use a lot). Then the user user can download on it on his machine, point his browser to it and voila.
If you combine javascript with HTML5 (and assuming the user has a HTML5 compliant browser like safari), your application can use localStorage to keep its state in the user's machine (thus no longer needing to be self-modifiable to save state as TiddlyWiki does.)
But this would break your rule of not downloading anything on the user's host machine. It is a chicken-and-egg problem that has no solution since each OS implements its own set of application libraries. For multi-platform support, you must use a layer that abstracts out differences between operating systems, be it a vm (like JVM, Ruby or Mono) or a set of libraries (Qt, Gnome).

As far as i know you won't be able to accomplish that with no other installations needed by the user. If you violate this restriction, mono (with gtk#) is a good choice.

Scala and Groovy will have the same deployment issues as Java; all of these require a JVM to be installed. You generally have to first install the JVM (which is not included with Windows) and then install your program. Java is included in OS X, however.
It is possible to use Ruby or Python and one of the cross platform libraries (like wxWidgets) and compile these to an executable file that includes the entire set of runtime libraries (e.g. all of ruby and python).

REAL Studio (formally REALbasic) certainly meets this requirement. It creates native applications that have no external dependencies for OS X and Windows (plus Linux).

In theory you could write a .net application using Mono that it should run without issues on any other one with the .net runtime environment installed.
But I'm not sure if it will work on practice.

I've had some success with XulRunner
There's also a couple of recommendations from these questions I asked
Building Cross Platform app - recommendation
Building XUL app a-la SongBird
XULRunner is pretty cool once you get into it, but it's a tad confusing at first (I thought).. the folks on the mozilla google groups are really nice and helpful though!