Download Error Exception in 1.6. Works in all older versions.

Question

I had some customers complaining that Java Web Start stopped working after upgrading to Java 1.6. I got the following after I upgraded.
JNLPException[category: Download Error : Exception: null : LaunchDesc: null ]
     at com.sun.javaws.LaunchDownload.downloadJarFiles(Unknown Source)
     at com.sun.javaws.LaunchDownload.downloadEagerorAll(Unknown Source)
     at com.sun.javaws.Launcher.downloadResources(Unknown Source)
     at com.sun.javaws.Launcher.prepareLaunchFile(Unknown Source)
     at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
     at com.sun.javaws.Launcher.launch(Unknown Source)
     at com.sun.javaws.Main.launchApp(Unknown Source)
     at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
     at com.sun.javaws.Main$1.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
I get the following on the console:
#### Java Web Start Error:
#### Unable to load resource: http://barracudaserver.com/products/BarracudaDrive/HttpsTunnelWS.jar
I have cleared the Java cache, but the Java client still sends a " If-Modified-Since" so the server responds with a 304 Not Modified.
If-Modified-Since: Wed, 31 Dec 1969 23:59:59 GMT
That is a long time ago.
I have attached the HTTP headers at the bottom.
Any ideas?
BTW, it would be great if SUN could make things backward compatible. This JNLP file is integrated inside a product and requires that all customers upgrade the product.
A copy of the JNLP file is available online at:
http://barracudaserver.com/products/BarracudaDrive/HttpsTunnelClient.html
GET /products/BarracudaDrive/HttpsTunnelWS.jar HTTP/1.1
content-type: application/x-java-archive
accept-encoding: pack200-gzip,gzip
User-Agent: JNLP/6.0 javaws/1.6.0_01 (b06) Java/1.6.0_01
UA-Java-Version: 1.6.0_01
Host: barracudaserver.com
Cache-Control: no-cache
Pragma: no-cache
Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
Connection: keep-alive
If-Modified-Since: Wed, 31 Dec 1969 23:59:59 GMT
Cookie: __utma=72791808.1501057734.1166376940.1177887848.1178031465.9; __utmz=72791808.1177300532.7.3.utmccn=(referral)|utmcsr=localhost|utmcct=/setup/wizard/SetAdmin.lsp|utmcmd=referral; phpbb2mysql_data=a%3A2%3A%7Bs%3A11%3A%22autologinid%22%3Bs%3A0%3A%22%22%3Bs%3A6%3A%22userid%22%3Bi%3A-1%3B%7D
HTTP/1.1 304 Not Modified
Date: Tue, 01 May 2007 17:44:38 GMT
Server: BarracudaServer.com (Posix)
Connection: Keep-Alive
Content-Type: application/java
Etag: 461adac6
Last-Modified: Tue, 10 Apr 2007 00:31:02 GMT
Content-Length: 0
Message was edited by:
wi_ni
Message was edited by:
wi_ni

Answer 1

JNLP version ?
i tried to look up in my control panel
and i have in user tab
1.6     1.6.0_01     http://java.sun.com/products/autodl/j2se     C:\Program Files\Java\jre1.6.0_01\bin\javaw.exe     true
system tab
1.6     1.6.0_01     http://java.sun.com/products/autodl/j2se     C:\Program Files\Java\jre1.6.0_01\bin\javaw.exe     true
and java -version is
java version "1.6.0_01"
Java(TM) SE Runtime Environment (build 1.6.0_01-b06)
Java HotSpot(TM) Client VM (build 1.6.0_01-b06, mixed mode, sharing)
here is my JNLP test program
<?xml version="1.0" encoding="utf-8"?>
<jnlp spec="1.0+" codebase="http://172.22.90.128/Rel05_01_052">
<information>
<title>JNLPTest</title>
<vendor>JNLPTest</vendor>
<description>JNLPTest</description>
<offline-allowed/>
</information>
<security><all-permissions/></security>
<resources>
<j2se version="1.5" initial-heap-size="64m" max-heap-size="512m"/>
<jar href="iMS/STS-6.jar.pack.gz"/>
<property name="Secure" value="false"/>
</resources>
<application-desc main-class="SwingTest"/>
</jnlp>
and this same works in machine where i have 1.5.
I don't know the reason why java 1.6 webstart throw this error
java.io.IOException: Corrupted pack file: magic/ver = CAFED00D/160.1 should be CAFED00D/150.7
     at com.sun.java.util.jar.pack.NativeUnpack.start(Native Method)
     at com.sun.java.util.jar.pack.NativeUnpack.run(Unknown Source)
     at com.sun.java.util.jar.pack.NativeUnpack.run(Unknown Source)
     at com.sun.java.util.jar.pack.UnpackerImpl.unpack(Unknown Source)
     at com.sun.deploy.net.HttpDownloadHelper.download(Unknown Source)
     at com.sun.deploy.cache.Cache.downloadResourceToCache(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.actionDownload(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.getCacheEntry(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.getResourceCacheEntry(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.getResourceCacheEntry(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.getResource(Unknown Source)
     at com.sun.javaws.LaunchDownload.downloadJarFiles(Unknown Source)
     at com.sun.javaws.LaunchDownload.downloadEagerorAll(Unknown Source)
     at com.sun.javaws.Launcher.downloadResources(Unknown Source)
     at com.sun.javaws.Launcher.prepareLaunchFile(Unknown Source)
     at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
     at com.sun.javaws.Launcher.launch(Unknown Source)
     at com.sun.javaws.Main.launchApp(Unknown Source)
     at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
     at com.sun.javaws.Main$1.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)