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To reduce the size of a Java Web Start application Sun Microsystems introduced a compression system called Pack200 in Java 1.5.0.
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.The development of JNLP took place under the Java Community Process as JSR 56.Important Web Start features include the ability to automatically download and install a JRE in the case where the user does not have Java installed, and for programmers to specify which JRE version a given program needs in order to execute.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).Only signed applications can be configured to have additional permissions.
Web Start has an advantage over applets in that it overcomes many compatibility problems with browsers' Java plugins and different JVM versions.
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.
JNLP works in a similar fashion to how HTTP/HTML works for the web.