Hi.
  With 6.0.2, I'm experimenting with the use of web-exec-server.xml found in business-central.war/WEB-INF.  In doing so, I'm encountering an "Unable to instantiate JAXBContext" exception when invoking the REST API of the execution server.  Turns out this config file is missing the following filter elements:

<filter>
    <filter-name>Dynamic JAXBContext Filter</filter-name>
    <filter-class>org.kie.remote.services.rest.jaxb.DynamicJaxbContextFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>Dynamic JAXBContext Filter</filter-name>
    <url-pattern>/rest/*</url-pattern>
</filter-mapping>

Adding these filter elements resolves the problem and the exec server works fine.

jeff