I am working with Java web start. After launching application with Java web start, it checks for java environment in our system. If required java version is not found, then it downloads appropriate version to our system for that application only,but not affecting the system environment.
My question is that if in my system there are Java1.3. and I am
launching 2 or more than 2 different applications using Java web
start,which all required java 1.6 . Then are they all downloads
different copies of java? If yes,then there is any way that only one
copy of java should get downloaded.
Then are they all downloads different copies of java?
No.
Related
I am using Elasticsearch which uses Java 8. I also want to install kafka on the same machine but kafka uses java 11. Both services are to be run in parallel. Can anyone tell how can I run both java versions at same time?
Manually download and unpack Java
https://adoptium.net/releases.html?variant=openjdk11
https://www.azul.com/downloads/?version=java-17-lts&os=windows&architecture=x86-64-bit&package=jre
Instead of simply starting java with the
java -args commandline,
you can start it via /install/path/to/java/bin/java -args
or, for windows, use C:\install\location\bin\java.exe -args
You might want to make some start scripts / batch files for that, depending on the exact requirements of your system and Elasticsearch and kafka and possibly other software.
That's it.
one little addition:
If you can NOT directly call java, or the software starts more java apps via the 'default' java, you can also use scripts to manipulate the PATH variables of your system before starting the app. Then you (and your apps) can simply call java -args again.
Once you download different versions of JRE(java runtime environment) to your local, if you use Eclipse IDE, you can checkout different projects in single workspace & specify Java Build Path with JRE version you want.
This way, you can run multiple applications having different versions of Java.
I think other java IDEs also have this kind of support.
I have searched the forum for my question but have not found the precise info i need..
I have two web start applications that uses 2 different versions of java.. How is it possible for these to work on the same computer one app using version 1.6.0_30 and the other 1.8.
Inside the .jnlp file you will find attribute spec. Value assigned to it inform what Java Web Start is required to use the application.
Java is backword compatible so having only version 8 you will be able to run something dedicated to version 6.
Java allows to have multiple versions on single machine and also mange them.
I am trying to understand what are the use cases for using Java Web start. What are the advantages of it over a web application. Is Java web start still relevant today?
What are the advantages of Java WebStart over a web application
These two are very different approaches to implement an application:
A Web Application typically refers to an application which runs completely on the server side (keeping aside JavaScript, which executes inside the browser) and uses a web browser to visualize its user interface and handle user inputs. The main advantage of such an application is that no software needs to be installed on the client side, besides the browser (which is usually available on any system today). Sometimes this is referred to as "zero-deployment".
Java WebStart on the other hand is a deployment technology which allows to download applications and run them locally on the client. The starting point is again the everywhere-available browser (or more specifically a URL), but once clicked, the URL downloads binary components (.jar files, but also system dependent native binaries) to the local system and then they are run locally. This also requires a very low effort from deployment perspective, but at least a Java Runtime environment needs to be available locally. But still, it is much less effort to run an application than having to download a installer, launch the installer, choose an installation directory etc. Java WebStart does that for you. Additionally, it also automatically handles updates - when the url is clicked subsequently, WebStart checks if the files have changed since the last run and downloads them as necessary. Otherwise, it uses the files from a local cache.
Is Java web start still relevant today?
Yes, definitely. If you have a rich (Java) application which needs to run locally on the client, you can use WebStart to deploy it with very low effort - all you need to send to the users is a URL.
See also
https://stackoverflow.com/tags/java-web-start/info
Is it possible to use Java webstart execute .exe or dll?
Java Web Start and Web applications solve two very different problems. A Web Start program is a regular graphical application program that is downloaded to and run on the user's computer. It acts like any other downloaded program written in Java, and typically uses a toolkit like Swing for its interface. It'll need to be digitally signed and approved by the user, and the user will have to have a JRE installed on the client computer. Web Start is just a convenient way to get the jars for the application downloaded and kept up to date. Web Start is useful for applications that need quick response times, lots of computation, or to access files on the user's computer (e.g., a photo uploader).
Web applications, on the other hand, are Web sites with interactive features. Examples include everything from Google's search suggestions to Facebook to Stack Exchange. Java is a useful language to write Web applications in, with tools like Spring and Hibernate, but a Web application is just a Web site that's delivered to the user as HTML and Javascript and runs in a Web browser.
I need some pointers to relevant information.
I'm trying to generate a Mac application bundle that contains a Java program. For Java 6 this is fairly easy.
But as far as I know, Java is no longer included with OS X, and in particular there is no guarantee that Java 7 is installed on a user's Mac computer.
Googling only brings confusion. There are hundreds of web pages that tell you how to deploy Java on a Mac, and there are dozens of tools that help you generate the application bundes. The problem is that most of these were written for creating applications that use Java 6. I have not yet found relevant information that I can use with Java 7.
So,
Where can I find information about how to deploy Java 7 applications on a Mac?
Is it possible to include the Java 7 VM in the application bundle, or do the users have to dowload and install it separately?
I'm interested are there any ways to create completely standalone desktop apps on JAVA? I mean to pack JAVA runtimes in distribution package, build apps for MAC/PC running *.jar files and get completely cross-platform software not depending on JAVA installed on target machine?
This is plainly not possible. You would need at least one executable wich would start on any platform you support to start setup/configuration. You may though use different wrappers for the specific OS to simplify installation of runtimes