Orbeon 4.3 throws ValidationException when trying to access MySQL - mysql

Question

After solving my initial properties-local.xml issue, I have moved on to another problem. I initially had a naming context error that I resolved by changing the value of oxf.fr.persistence.provider.*.*.* to be db matching my resource definition for JBoss.
Now, when saving a form definition I receive an error dialogue with the message.
There was an error communicating with the database.
Please contact the application administrator.
When I check the server.log I noticed that the first exception occurred after clicking continue after inputting the new form name, title and description.
The exception is this:
21:41:26,312 ERROR [org.orbeon.oxf.controller.PageFlowControllerProcessor] (http--127.0.0.1-8080-8) error caught {controller: "oxf:/apps/fr/page-flow.xml", method: "GET", path: "/fr/service/persistence/crud/orbeon/library/form/form.xhtml"}
21:41:26,406 ERROR [org.orbeon.oxf.controller.PageFlowControllerProcessor] (http--127.0.0.1-8080-8)
+----------------------------------------------------------------------------------------------------------------------+
|An Error has Occurred |
|----------------------------------------------------------------------------------------------------------------------|
|org.orbeon.oxf.common.ValidationException: line 18, column 47 of oxf:/apps/fr/persistence/proxy.xpl (executing process|
|----------------------------------------------------------------------------------------------------------------------|
|Application Call Stack |
|----------------------------------------------------------------------------------------------------------------------|
|oxf:/apps/fr/page-flow.xml |reading page model data output| 18|
|······················································································································|
|element=<service path="/fr/service/persistence/.*" model="persistence/proxy.xpl"/> |
|model =persistence/proxy.xpl |
|----------------------------------------------------------------------------------------------------------------------|
|oxf:/apps/fr/persistence/proxy.xpl |executing processor | 18|
|······················································································································|
|element=<p:processor name="fr:persistence-proxy"/> |
|name ={http://orbeon.org/oxf/xml/form-runner}persistence-proxy |
|----------------------------------------------------------------------------------------------------------------------|
|----------------------------------------------------------------------------------------------------------------------|
|Exception: java.lang.NullPointerException |
I'm assuming my properties-local.xml needs some work. Here are the contents:
<properties xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:oxf="http://www.orbeon.com/oxf/processors">
<property as="xs:string" name="oxf.fr.persistence.provider.*.*.*" value="db"/>
<property as="xs:string" name="oxf.fr.persistence.mysql.datasource" value="db"/>
</properties>
I had the same error without the second property.