Gemini JPA / EclipseLink Problem in e4 RCP Application

I'm not completely certain where my issue is coming from i.e. EclipseLink or Gemini JPA, so I'm hoping that's the first thing you can point me to.
When my application starts up I'm getting this on the console:
[EL Config]: metadata: 2015-07-27 13:26:03.641--ServerSession(675233602)--Thread(Thread[Refresh Thread: Equinox Container: 00913eb3-9d34-0015-1b66-dbde7e24aedc,5,main])--The alias name for the entity class [class <snip>] is being defaulted to: <snip>.
WARNING: DataSourceFactory service for com.microsoft.sqlserver.jdbc.SQLServerDriver was not found. EMF service not registered.
And when I go to use JPA in the application, I get this:
*** FATAL ERROR *** Could not create data source for com.microsoft.sqlserver.jdbc.SQLServerDriver
The lines that start with [EL Config] suggest (to me at least) that JPA is starting up, and is reading my persistence.xml file.
I just switched the application from Gemini JPA 1.1.0.RELEASE and EclipseLink 2.4 to Gemini JPA 1.2.0.M01 and EclipseLink 2.6 in an effort to fix the issue, but it hasn't helped. (To be clear, the issue did occur with the release Gemini JPA, and is still occurring with the newer Gemini JPA).
I've attached my persistence.xml file (redacted...), since I can't inline it here.
Should I be looking in Gemini or in EclipseLink for the solution to this issue?
I've tried Googling the issue, but don't get useful results.
I'm less concerned for the first issue (the WARNING), and more concerned for the second issue.
My next step is to set the individual connection properties, and drop the URL, maybe that will work.
*edit* I realized I should have mentioned that the SQL Server JDBC driver jar is in the lib folder of the project, and should be set to export with the project. lib is also declared as part of the bundle class path in the manifest file.
Thank you for taking the time to read my post.
Dominic Hilsbos

After changing my persistence.xml, I got a ClassNotFoundException, which told me that EclipseLink couldn't find my jdbc driver.
I found my error, it was in the Bundle-Classpath.
I had: .,lib/
What I needed was; .,lib/sqljdbc41.jar
Thank you to all who looked at this.
Dominic Hilsbos

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