Misleading error message when attempting to download nonexistent bundle

Number Format Exception while downloading rmi bundle.

Surprisingly after repeated retries it downloaded. ( Dont know the reason)
Reproducible almost all m/cs. ( jdsn9.india.sun.com - vnc123)

Stpes to reproduce :
Install Kernel JRE
and run java -Dkernel.debug=true sun.jkernel.DownloadManager -download rmi

Here is the exception :

C:\Users\Pradeep>java -Dkernel.debug=true -version
DownloadManager startup
Checking for requested bundles...
Requested bundles: [java.rmi]
java version "1.6.0_10"
Java(TM) SE Runtime Environment (build 1.6.0_10-b313)
Java HotSpot(TM) Kernel VM (build 11.0-b11, mixed mode)
Downloading Bundle[java.rmi] due to requested.list
Exception in thread "BundleDownloader" java.lang.NumberFormatException: null
        at java.lang.Integer.parseInt(Unknown Source)
        at java.lang.Integer.valueOf(Unknown Source)
        at sun.jkernel.Bundle.getSize(Unknown Source)
        at sun.jkernel.Bundle.install(Unknown Source)
        at sun.jkernel.DownloadManager.downloadRequestedBundles(Unknown Source)
        at sun.jkernel.DownloadManager.access$100(Unknown Source)
        at sun.jkernel.DownloadManager$2$2.run(Unknown Source)