host any simple JNLP application on a webserver.

launch it first to get it into the cache.

update it on the webserver.

launch again, update should be downloaded into the cache.

look at the log, you will see multiple requests made for the updated resource.

this affects performance.

network: Cache entry found [url: http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jnlp, version: null] prevalidated=false/0
network: Connecting http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jnlp with proxy=DIRECT
network: Connecting socket://javaweb.sfbay.sun.com:80 with proxy=DIRECT
network: Connecting http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jnlp with cookie "s_vi=[CS]v1|25A6A47105011316-60000109402C7CB0[CE]; s_nr=1263419431406"
network: ResponseCode for http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jnlp : 200
network: Encoding for http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jnlp : null
network: Disconnect connection to http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jnlp
basic: Update JNLP: http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jnlp, thisCodebase: null
network: Cache entry found [url: http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jnlp, version: null] prevalidated=false/0
network: Connecting http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jnlp with proxy=DIRECT
network: Connecting http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jnlp with cookie "s_vi=[CS]v1|25A6A47105011316-60000109402C7CB0[CE]; s_nr=1263419431406"
network: ResponseCode for http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jnlp : 200
network: Encoding for http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jnlp : null
network: Disconnect connection to http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jnlp
network: Connecting http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jnlp with proxy=DIRECT
network: Connecting socket://javaweb.sfbay.sun.com:80 with proxy=DIRECT
network: Connecting http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jnlp with cookie "s_vi=[CS]v1|25A6A47105011316-60000109402C7CB0[CE]; s_nr=1263419431406"
network: ResponseCode for http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jnlp : 200
network: Encoding for http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jnlp : null
network: Sever response: (length: 1041, lastModified: Wed Feb 03 15:36:29 PST 2010, downloadVersion: null, mimeType: application/x-java-jnlp-file)
network: CleanupThread used 13457 us
network: Downloading resource: http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jnlp
Content-Length: 1,041
Content-Encoding: null
network: Wrote URL http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jnlp to File C:\Documents and Settings\ngthomas\Application Data\Sun\Java\Deployment\cache\6.0\43\eae1cab-5499e2fe-temp
network: Disconnect connection to http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jnlp
network: CleanupThread used 3 us
network: Cache: Enable a new CacheEntry: http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jnlp


network: Cache entry found [url: http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jar, version: null] prevalidated=false/0
network: Connecting http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jar with proxy=DIRECT
network: Connecting http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jar with cookie "s_vi=[CS]v1|25A6A47105011316-60000109402C7CB0[CE]; s_nr=1263419431406"
network: ResponseCode for http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jar : 200
network: Encoding for http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jar : null
network: Disconnect connection to http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jar
network: Connecting http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jar with proxy=DIRECT
network: Connecting socket://javaweb.sfbay.sun.com:80 with proxy=DIRECT
network: Connecting http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jar with cookie "s_vi=[CS]v1|25A6A47105011316-60000109402C7CB0[CE]; s_nr=1263419431406"
network: ResponseCode for http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jar : 200
network: Encoding for http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jar : null
network: Sever response: (length: 225984, lastModified: Wed Feb 03 15:36:29 PST 2010, downloadVersion: null, mimeType: application/java-archive)
network: CleanupThread used 3 us
network: Downloading resource: http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jar
Content-Length: 225,984
Content-Encoding: null
network: Wrote URL http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jar to File C:\Documents and Settings\ngthomas\Application Data\Sun\Java\Deployment\cache\6.0\25\321d8e99-5c74d1b9-temp
network: Disconnect connection to http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jar
network: CleanupThread used 3 us
network: Cache: Enable a new CacheEntry: http://javaweb.sfbay.sun.com/~ngthomas/shortcut/draw.jar