"Failed to read schema document" when using Spring namespaces in Camel-on-EAP

Issue

Trying to make use of Spring-provided resources like transactions can result in errors as shown below. These errors may appear only if working offline (being connected results in successful deployment).

WARN  [org.wildfly.extension.camel.SpringCamelContextFactory$1] (MSC service thread 1-8) Ignored XML validation warning: org.xml.sax.SAXParseException; lineNumber: 10; columnNumber: 84; schema_reference.4: Failed to read schema document 'http://www.springframework.org/schema/jee/spring-jee.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
    at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:196)