Why can't my regular application context load my properties file?
This comes down to where different application contexts look for their resources.
A unit test context looks at the classpath, but a webapp context looks inside the webapp. So when your webapp looks for localdevelopment_Company.properties, it's looking for a file at the root of the webapp.
If your file is actually on the classpath, then you need to override the webapp context's default search location:
<value>classpath:localdevelopment_Company.properties</value>