FULL PRODUCT VERSION :
java version "1.7.0_01"
Java(TM) SE Runtime Environment (build 1.7.0_01-b08)
Java HotSpot(TM) Client VM (build 21.1-b02, mixed mode, sharing)

Can also be reproduced with Java 6.

ADDITIONAL OS VERSION INFORMATION :
Windows

A DESCRIPTION OF THE PROBLEM :
Unchanged Web Start icon file with newer date will get downloaded to new cache location, but does not get updated in desktop shortcut.

If file date of jnlp file also changed, then the shortcut will get re-created with old (deleted) icon file.


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
STEPS TO REPRODUCE:
- download a web start client
- update some resource jar files on the server
- touch icon file, so it will have a newer date
(JNLP file doesn't change)
- download the updated web start resources from the desktop shortcut


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
EXPECTED RESULT:
If an icon file is downloaded and the old one is deleted from cache, then it should be converted to ICO and the shortcut has to be adjusted.
ACTUAL -
ACTUAL RESULT:
The old icon file is gone from the cache - "Change Icon" from desktop shortcut displays:
Windows can't find file
%USERPROFILE%\AppData\LocalLow\Sun\Java\Deployment\cache\...\5336cb0e-5ff2eb2a.ico

The newly downloaded file (as shown in the trace) is found in the cache.
No new icon file is created and no shortcut update is done.
The icon image will sometimes still be visible on the desptop, because of the Windows Icon Cache.
Sometimes a generic Windows Icon will be displayed instead.


ERROR MESSAGES/STACK TRACES THAT OCCUR :
"Change Icon" from desktop shortcut displays:
Windows can't find file
%USERPROFILE%\AppData\LocalLow\Sun\Java\Deployment\cache\...\5336cb0e-5ff2eb2a.ico


Client download trace:

network: Cache entry found [url: http://myserver:8080/MYPATH/myicon.png, version: null] prevalidated=false/0
...
network: ResponseCode for http://myserver:8080/MYPATH/myicon.png : 200
network: Encoding for http://myserver:8080/MYPATH/myicon.png : gzip
network: Disconnect connection to http://myserver:8080/MYPATH/myicon.png
...
network: ResponseCode for http://myserver:8080/MYPATH/myicon.png : 200
network: Encoding for http://myserver:8080/MYPATH/myicon.png : gzip
network: Sever response: (length: 4901, lastModified: Mon Nov 21 23:35:36 TAHT 2011, downloadVersion: null, mimeType: image/png)
network: Downloading resource: http://mysever:8080/MYPATH/myicon.png
Content-Length: 4.901
Content-Encoding: gzip
network: CleanupThread used 2 us
network: Wrote URL http://myserver:8080/MYPATH/myicon.png to File C:\Users\myuser\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\14\5336cb0e-668e88c3-temp


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
jnlp file:
<?xml version="1.0" encoding="UTF-8"?>
<!-- JNLP File to use for Java Webstart -->
<jnlp
  spec="1.0+"
  codebase="http://myserver:8080/MYPATH"
  href="myApp.jnlp">
  <information>
    <title>Standard Client</title>
    <vendor>Company Name</vendor>
    <description>Webstart configuration for MYAPP</description>
    <icon href="myicon.png"/>
    <shortcut online="true">
      <desktop/>
      <menu submenu="MYAPP"/>
    </shortcut>
  </information>
  <update check="always" policy="always"/>
  <security>
      <all-permissions/>
  </security>
  <resources>
    <j2se version="1.6+" initial-heap-size="128M" max-heap-size="256M"/>
...
some jar files
...
 </resources>
  <application-desc main-class="com.xxx">
...
  </application-desc>
</jnlp>
---------- END SOURCE ----------
Verified with build b255-94, on win7/x86.