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Only signed applications can be configured to have additional permissions.
JNLP consists of a set of rules defining how exactly to implement the launching mechanism.
Web Start programs are no longer an integrated part of the web page, they are independent applications that run in a separate frame. Applet launcher may not support some specific cases like loading class as resource. The developer prepares a special XML file with JNLP extension.
Web Start can also launch unmodified applets that are packaged inside files, by writing the appropriate JNLP file. This file describes the application requirements, code location, parameters and additional permissions (if any).
The browser then requests the resources referred to by this file (images, css), and finally renders the page once it has received enough information.
Page rendering usually starts before all resources have downloaded; some resources not critical to the layout of the page (such as images) can follow on afterwards.
JNLP works in a similar fashion to how HTTP/HTML works for the web.
For rendering an HTML webpage, after the user clicks on a weblink, the browser submits a URL to a webserver, which replies with an HTML file.
Unlike Java applets, Web Start applications do not run inside the browser.
By default they run in the same sandbox as applets, with several minor extensions like allowing to load and save the file that is explicitly selected by the user through the file selection dialog.
JNLP mirrors this process; in the same way that a Web browser renders a webpage, a JNLP client "renders" a Java app.
After the user clicks on a weblink, the browser submits an URL to a webserver, which replies with a JNLP file (instead of a HTML file) for the application.
In computing, Java Web Start (also known as Java WS, javaws or JAWS) is a framework developed by Sun Microsystems (now Oracle) that allows users to start application software for the Java Platform directly from the Internet using a web browser.