private boolean isCollectionClass(final Class<?> clazz) {
        return clazz.isAssignableFrom(List.class)
                || clazz.isAssignableFrom(Map.class)
                || clazz.equals(DocRef.class);
    }
Test to verify that all fields in the config tree of type stroom.*
implement IsProxyConfig . Also useful for seeing the object tree
and the annotations
stroom-proxy/stroom-proxy-app/src/test/java/stroom/proxy/app/TestProxyConfig.java