Recent improvements in deployment technologies enable us to launch rich Internet applications (RIAs) by using JNLP. Both applets and Java Web Start applications can be launched by using this protocol. RIAs that are launched by using JNLP also have access to JNLP APIs. These JNLP APIs allow the RIAs to access the client desktop with the user's permission.
The developer prepares a special XML file with JNLP extension. This file describes the application requirements, code location, parameters and additional permissions (if any). The browser downloads this file as any other and (following its MIME type, application/x-java-jnlp-file) opens it with Web Start tool. Web Start tool downloads all necessary resources and launches the application.
Download Java Network Launch Protocol (jnlp) File
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Java Web Start provides a series of classes in the javax.jnlp package which provide various services to the application. Sun designed most of these services with the aim of allowing carefully controlled access to resources (such as files and the system clipboard) while restricting the application to authorized operations.
Programmers often speak of the Java Network Launching Protocol (JNLP) interchangeably with the term "Web Start". The JNLP protocol, defined with an XML schema, specifies how to launch Java Web Start applications. JNLP consists of a set of rules defining how exactly to implement the launching mechanism. JNLP files include information such as the location of the jar package file and the name of the main class for the application, in addition to any other parameters for the program. A properly configured browser passes JNLP files to a Java Runtime Environment (JRE) which in turn downloads the application onto the user's machine and starts executing it. The development of JNLP took place under the Java Community Process as JSR 56. It includes the original 1.0 release, the subsequent 1.5 maintenance release, and as of 2006[update], the pending 6.0 maintenance release.[clarify]
The CompatibilityApplet.jar contains a tiny applet (the source code of which can be downloaded here) which simply displays a notice to users of an older version of the Java Plug-In that this content requires the new Java Plug-In, and directs them to the download page. Older versions of the Java Plug-In will use the code and archive parameters from the tag. The new Java Plug-In will use scenario-applet.jnlp to launch the applet and will ignore the code and archive parameters.
Jake2 was originally designed as an application and sets up some global state for example in its networking code. It does not work well when two copies of the code are launched in the same JVM. This is fine for Java Web Start deployment, but applets typically reuse the same JVM instance. To allow easy redeployment of Jake2 as an applet, we use the new separate_jvm applet parameter (described in the new Java Plug-In's release notes) to force a fresh JVM instance to be created each time we launch the Jake2 applet.
Java web start is the 0-install solution in the java world.An application built to use Java web start (JWS) will be available as a link in a web site. This site will have the .jnlp extension.When a user clicks this link (and clicks the "execute" button of his browser) , the javaws.exe runtime will be launched. This executable will download the application and dependencies (libraries, images, and so on) and launch the application using the provided main-class of the .jnlp file).
If you want Firefow launch directly JNLP files, go to Firefox preferences and search "type".It will list all file type and the associated action to do.For JNLP files, edit the property and select custom program.Il will open your system browser and then, select :/usr/lib/jvm/jre1.8.0_361/bin/javaws
Original Java Specification Request (JSR) Identification | Request | ContributionsOriginal Summary: A specification of protocols and APIs that will enable JavaTM applications to be deployed on the Web. An implementation of this specification will support Web deployed applications by enabling distributing an application on a Web server and launching the application from any Web browser.Section 1. IdentificationSubmitting Participant: Sun Microsystems, Inc.
A specification of protocols and APIs that will enable Javaapplications to be deployed on the web. An implementation of thisspecification will support web deployed applications by enablingdistributing an application on a web server and launching theapplication from a web browser. The components of this infrastructureare likely to include:
A JNLP file is a Java Web Start (JWS) file, saved in the Java Network Launching Protocol (JNLP) format. It contains XML information used to launch and manage a Java program (.JAR file) over a network. This information includes the remote address from which to download the program and the initial class to run.
In order to use JNLP, the browser must be configured to call theJNLP helper when it is sent a .jnlp file. This meansfirstly that a MIME type must be associated to files with the.jnlp extension:application/x-java-jnlp-file jnlpThen the browser must be told what action to perform on such files:application/x-java-jnlp-file $JAVAWS_HOME/javaws %s
The application's JAR file is placed in a WAR file together with a .jnlp file (the launch file). This tells Java Web Start on the client what to download and allows it to check whether it already has the application installed.
In the simplest form all that is required is a normal hyperlink to the jnlp file, this then launches the application if it is present on the client or downloads the necessary files if it is not.
For a developer Java and/or JWS (JWS is part of J2SE from 1.4 onwards) is probably already installed. However, for an end user they may not be. In this case the webapp has to determine what is installed in order to know what link to display. Some JavaScript/VBScript can be used to determine if JWS is installed and from that either display a link to the jnlp file or to a page that downloads the required JRE and then launches the application after (Windows only).
Java Web Start was a deployment technology, which allowed for an application to automatically install and update when the user runs it. It has been part of Java since version 5. Java Web Start applications were configured through files with the .jnlp extension for Java Network Launch Protocol (JNLP). The JNLP extension was associated with the javaws.exe such that a Java Web Start application can be launched in the browser by double clicking it or from the command line with javaws .
Using markup languages to generate user interfaces proves advantageous due to those languages' ubiquity and light weight. However, a markup-language-based UI is fairly limited. Java Web Start overcomes this main limitation while preserving some of a markup-language UI's main benefits, such as using a network URL as a launching point, updating client applications without intervention, and so on. Using Java Web Start, it's possible to design desktop Web clients that provide a rich user experience decoupled from a browser.
I'll show you how you can make the example program -- SimpleExample, a simple (Java Foundation Classes) JFC demonstration -- network accessible using JNLP. This example is provided as part of the Java SDK. As outlined in the developer's guide (see Resources), create the SimpleExample.jnlp file:
Finally, configure the Web server to use the appropriate MIME type. The server must return the application/x-java-jnlp-file MIME type for JNLP files in order for Java Web Start to invoke. This is obviously Web-server-dependent. In Jigsaw, the jigadmin tool can achieve this. Tucked away in http-server/Indexers/default are extensions to which needs to be added to return the MIME type as noted above.
To add the new jnlp element to replace for declaring the java version to use, and reflecting the namechange of java from "Java 2 Standard Edition" or "J2SE"to "Java[TM] Standard Edition" or "Java[TM] SE",and to update various examples.
Both Java Plug-in and Java Web Start support the deployment of applets and applications over many types of network protocols (e.g. HTTP, HTTPS, FTP, SOCKS) and many types of security authentication (HTTP Basic, Digest, NTLM).
Many organisations still rely on legacy applications that require Java Web Start (JWS) and utilise the JNLP file standard to function. The JNLP file allows java based applications to be launched on a desktop using resources hosted from a remote server that are launched from a Java ARchive (JAR) file.
Another notable change is replacing the JNLP agent term with inbound agent.Historically "JNLP" has been used as a name of Remoting protocols.JNLP stands for Java Network Launch Protocol which is a part of the Java Web Start.Jenkins supports Java Web Start mode for agents when running agents on Java 1.8,but our networking protocols are based on TCP and have nothing to do with Java Network Launch Protocol.This name has been very confusing since the beginningand became worse with the introduction of WebSocket support in Jenkins 2.217 (JEP-222).Docker agent images support WebSockets, so we decided to change the image name to jenkins/inbound-agent so that it prevents further confusion.Inbound agent term refers to agent protocols in which the agent initiates the connection to the Jenkins controller through different protocols. ff782bc1db
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