This document describes the most commonly used elements of a JNLP file. For a complete description of the format, refer to the specification. The JNLP file is an. JSR – Java™ Network Launching Protocol and API Specification v 1 Java(TM) Network Launching Protocol (JNLP) Specification. In computing, Java Web Start is a framework developed by Sun Microsystems ( now Oracle) that . jnlp spec=”+” codebase=”” href=””> Launch applet with Web Start Foo Bar.

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Can be used in an extension element to denote the parts contained in a component-extension.

The application is responsible for doing the actual call to System. The download attribute is used to control whether a resource specifjcation downloaded eagerly or lazily.

JNLP File Syntax

This is important because you can take advantage of this technology in a transparent way to your users. The environment dpecification consist of a security model such as the sandbox model, pre-configured proxy settings, support for showing a URL in the default browser.

The URL denoting the supplier of this version of Java software, and from where it can be downloaded.

Indeed, you may have different types of JNLP files, depending on what they describe. Thus, it is guaranteed that the user always runs the specificatioj version of the application. The information element contains other elements that describe the application and it’s source.

How To – Java Web Start

Part name containing the jar files that include the given package name. The root element is jnlpwhich has four subelements: The requested version of the JAR file. Given a reasonably fast server connection, the latest version specifocation the application will usually be run, but it is not guaranteed.

Indicates if this jar contains the class containing the main method of the application.


Structure of the JNLP File

jnlpp Then imagine adding capabilities, such as distinguishing between versions of the same file depending on some local parameter, and so on. For more information about character encoding spexification the Java platform, see the Supported Encodings Guide. This enables you to specify different icon images for your application.

If the update check is not completed before the timeout, the application is launched, and the update check will continue in the background. Indicates the downloadable size of the jar file in bytes. Sun provides all the details of the syntax element definitions, schema, and so on on its Web site. Specificatkon argument contains in order an additional argument to be passed to the main method. The policy attribute indicates the preference for how the JNLP Client should handle an application update when it is known an update is available before the application is launched, and can have one of the following three values: The shortcut element can be used to indicate an application’s preferences for desktop integration.

The jar file will typically contain Java classes that contain the code for the particular application, but can also contain other resources, such as icons and configuration files, that are spexification through the getResource mechanism. The optional related-content element describes an additional piece of related content, such as a readme file, help pages, or links to registration pages, as a hint to a JNLP Client.

Soecification Required, but never shown. A URL pointing to the icon file, may be in one of the following formats: Describes the name of a part that can be expected to be found in the extension. This class may be loaded first and used to indicate the progress of other resources being downloaded and verified. For a complete description of the format, refer to the specification. A set speciflcation parameters that can be passed into the applet.

Thus, if Java Web Start needs a description of kind shortand it is not specified in the JNLP file, then the text from the description without an attribute is used. It has two required attributes: Values can be always, prompt-update, or prompt-run.


Avoiding Unnecessary Update Checks. Instead of setting the classpath variable, you will write a special XML specificcation or more than one that describes carefully what the launcher called the JNLP Client should do before setting up a JVM instance to run your application.

If a platform version is specified i.

The most obvious answer is: Arguments can be specified to the application by including one or more nested argument elements. The kind attribute defines how the description should be used.

What Is JNLP All About? | A JNLP Tutorial: Part 1—An Introduction to JNLP | InformIT

That would save a lot of coding effort and such installation problems are very commonand would allow developers to have a great number of new unimagined capabilities. Can be used to group resources together so they will be downloaded at the same time. Can be used to indicate this extension may be downloaded eagerly or lazily. Value of the attribute can be 1.

A standard application execution environment for web deployed applications. The rest of the attributes correspond to the respective HTML applet tag elements. Specifies the locale for which this information element should be considered. The first time an application is launched following the addition or modification of the icon element in the JNLP file, the old splash image will still be displayed.

It can contain any of the following two sub-elements: An Example To Be Continued On Windows, this determines if the application appears in the Add and Remove Programs panel.