+1  A: 

It sounds like you are missing a namespace declaration or you have fat-fingered your XML. This is likely more of a Spring related issue than a CXF issue.

Check that the following items appear on your beans element where you declare httj:engine-factory:

<beans
  ...
  xmlns:httpj="http://cxf.apache.org/transports/http-jetty/configuration"
  ...
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="
      http://cxf.apache.org/transports/http-jetty/configuration http://cxf.apache.org/schemas/configuration/http-jetty.xsd
      ...">
  <import resource="classpath:META-INF/cxf/cxf-extension-http.xml" />
  <import resource="classpath:META-INF/cxf/cxf-extension-http-jetty.xml" />

Check that the CXF Jetty Transport JAR is in your classpath at runtime.

If you add the declaration and the schema location to your context file in your IDE (at least in Eclipse with the Spring plug-ins and IDEA) you should get schema validation right in your IDE so you can easily find any mistakes you make and take advantage of auto-completion.

DavidValeri