Is there a way to bind to a "org.apache.commons.beanutils.LazyDynaBean" in Spring?

I'm attempting to develop an AbstractCommandController that will bind one or more uploaded files (http) to a bean.

It works fine when files are designated with their own attribute name
(i.e. "fileOne=file1.txt" "fileTwo=file2.txt"); however, this requires a bean with a property for each attribute name, which is unknown in advance. So I'm attempting multiple files and Lazy binding (i.e. "files=file1.txt,file2.txt").

I've seen in some forum posts that lazy="true" can be set for some hibernate properties, does this apply to a command object? how?

:?