Most likely the userID that the Tomcat service is running under doesn't have file access permissions. Most Windows services run under a system service userID, although this can be changed via the service control panel.
An IDE is no substitute for an Intelligent Developer.
I’ve looked at a lot of different solutions, and in my humble opinion Aspose is the way to go. Here’s the link: http://aspose.com
subject: Shared folder not accessible when running tomcat as a service