Java Web Start: Difference between revisions

Revision as of 08:15, 30 March 2011

Revision as of 11:17, 13 July 2011

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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. It reduces byte counts so efficiently that it can compress a large jar file to one-ninth of its original size if it contains only Java classes.<ref>[http://java.sun.com/javase/6/docs/technotes/guides/deployment/deployment-guide/pack200.html#pack200_compression Pack200 and Compression for Network Deployment]</ref>

Java Web Start has supported Pack200 since it first appeared, but initially this feature required server-side cooperation and a certain amount of expertise to set up. When SUNSun introduced Java SE 6u10, Pack200 support became available without the need for special server support. Application designers can enable or disable this feature within JNLP files.

On slow connections Pack200 gives a performance boost in application startup time and download time.