Spring GroovyDynamicElementReader tries to read a Groovy script as XML and fails - rest

Question

When I looked at Spring Boot, I liked the idea that it:
Gets out of the way quickly if you want to change defaults. - Dave Syer, Spring One 2GX 2013
It wasn't long before practicality hit me. While trying to make Boot work with a 100% Groovy/no-XML pet project, I found 2 issues in 2 days. Here's one of them.
Groovy config file:
beans {
xmlns([ctx:'http://www.springframework.org/schema/context'])
ctx.'component-scan'('base-package':'name.abhijitsarkar.moviedatabase')
}
Exception:
Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Failed to read XML document; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Unable to determine validation mode for [Groovy]: cannot open InputStream. Did you attempt to load directly from a SAX InputSource without specifying the validationMode on your XmlBeanDefinitionReader instance?; nested exception is java.io.FileNotFoundException: Groovy cannot be opened because it does not point to a readable resource
at org.springframework.beans.factory.xml.XmlReaderContext.readDocumentFromString(XmlReaderContext.java:98)
at org.springframework.beans.factory.xml.XmlReaderContext$readDocumentFromString.call(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
at org.springframework.beans.factory.groovy.GroovyDynamicElementReader.invokeMethod(GroovyDynamicElementReader.groovy:96)
Also posted on Spring forum.