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 to indicated that specificqtion package names beginning with the given name, can be found in the given part. But publishers can remove these restrictions by signing their Web Start applications with the jarsigner tool that comes with the JDK.

A URL pointing to the icon file.

Java Web Start – Wikipedia

The main-class attribute is assigned the name of the Applet class without the. And if an update is found, the new application will be downloaded and launched. Specifies the operating systems for which this information element should be considered. The download attribute is used to control whether a resource is downloaded eagerly or lazily.

The os attribute contains a list of operating system names separated by spaces. Now, you will see how it works. Indicates that this RIA can operate when the client system is disconnected from the network. Arguments can be specified to the application by including one or more nested argument elements.

It can be always, timeout, or background. The name of the class containing the implementation of DownloadServiceListener, that may be used to indicate download progress.

The main-class attribute can be omitted if the first JAR file specified in the JNLP file contains a manifest file containing the main class. If the update check is not completed before the timeout, the application is launched, and the update check will continue in the background.


It can have one of the following values:. If offline-allowed is specifiedJava Web Start will also check to see if an update is available.

The elements are described in more detail below. A specification of protocols and APIs that will enable Java applications to be deployed on the web. Unlike Java specificatonWeb Start applications do not run inside the browser. On slow connections Pack gives a performance boost in application startup time and download time. If a platform version is specified i.

Description elements are optional. For example, you could use multiple resources definitions, with different os attributes, to supply a native library for multiple operating systems.

This attribute must be 1.

The java-vm-args attribute of the j2se element specifies a preferred set of virtual machine arguments to use when launching java. The kind attribute defines how the description should be used. The main-class attribute is used instead of the code attribute. This will prepare everything for the JVM to correctly execute your program.

The package and extension elements are not discussed in this developer’s guide. The name of the class containing the public static void main String[] method of the application.

The Java Community Process(SM) Program – JSRs: Java Specification Requests – detail JSR# 56

Java Web Start automatically resizes an icon to the appropriate size. October Learn how and when to remove this template message. The default value is “1. A description element without a kind is used as a default value. By using this site, you agree to the Terms spscification Use and Privacy Policy. That would be great. A pointer to an additional component-desc or installer-desc to be used with this RIA. Views Read Edit View history. For more information about character encoding in the Java platform, see the Supported Encodings Guide.


Value can be always, timeout, or background.

The elements are described in more detail below. If offline-allowed is specifiedJava Web Start will also check to see if an update is available.

The root element is jnlpwhich has four subelements: Requests that the RIA be run with a permission set that meets the security specifications of the J2EE application client environment. The resources element is used to specify all the resources, such as Java jlp files, native libraries, and system properties, that are part of the application.

If the element is not specified —i. A component extension is typically used to factor out a set of resources that are shared between multiple applications or spefification have separate security needs. The information element contains speification elements that describe the application and it’s source.

How To – Java Web Start for Alma

A JNLP file can contain multiple icon elements that differ by their kind attribute. The requested version of the jar file. Thus, it can typically be omited. Thus, jnop 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.