Repository Explorer does not work with a JSON configuration/connector

Configuring the Web Explorer application with a repository defined in a JSON config doesn't work and prints out a popup with the message: org.modeshape.web.server.impl.JsonConnectorImpl.
There are no other sever errors.

To reproduce this issue perform the following:
1. Build a fresh modeshape-web-explorer-war module, which will produce an empty, standalone modeshape-explorer.war file.
2. Manually edit this war file and:
2.1. add this config to the WEB-INF/classes folder
2.2 add the following to the web.xml

       <context-param>
          <param-name>connector-class&lt;/param-name>
              <param value>org.modeshape.web.server.impl.JsonConnectorImpl</param-value>
         </context-param>
 
          <context-param>       
             <param-name>config-url</param-name>
             <param-value>repository-config.json</param-value>
           </context-param>
       

3. Take this updated war and deploy it in a standalone container (I tested with a Tomcat 7 dist)
4. Access the Web Explorer webapp