Newbie Question: "org.apache.xerces.jaxp.DocumentBuilderFactory Impl not found"

New to Java and new to Spring\OSGI.

This should be a relatively easy question. I am trying to figure out why when one of the other developers modified a bundle to that requires xerces that a different bundle started to fail with the error "org.apache.xerces.jaxp.DocumentBuilderFactory Impl not found."

This is on a windows dm 2.0 server. While this bundle imports the first one to call a service I thought that there was more isolation between the bundles. I modified the service reference context-class-loader to service-provider but it had no effect.

Obviously, importing the missing jars fixed the problem. I was just hoping for a brief idea or link as to why.

Thanks,

Michael

Take a look at this other thread covering similar issues.