Delete file with write protection

Hello,
Is there any way to delete a file on Windows that is write protected? I have a web program that uploads images into a directory in docroot. The program also displays the images on a web page and allows the user to delete the images.
I have noticed that even after the server displays the images, they are still write protected. I assume by the application server. It doesn't always do this, but sometimes. When it happens I have noticed that restarting the application server corrects it. So, my code to delete the files doesn't work. Does anyone know a resolution to this? I am open to ideas.
File F = new File(fileLoc);
if (f.delete() == false)
System.out.println("Could not delete" + fileLoc);Thanks
Mike

Someone solved my problem on the Glassfish site. If you are using Glassfish, it can cache or not cache files in the docroot. Caching will set the write protection flag and thus make them impossible to delete.
To not cache, change the file-caching-enabled and globally-enabled to false in the build.xml
<http-file-cache file-caching-enabled="true" file-transmission-enabled="false" globally-enabled="true" hash-init-size="0" max-age-in-seconds="30" max-files-count="1024" medium-file-size-limit-in-bytes="537600" medium-file-space-in-bytes="10485760" small-file-size-limit-in-bytes="2048" small-file-space-in-bytes="1048576"/>
change to
set file-caching-enabled="false" and globally-enabled="false"

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