public void rebuildConfigInstances(final ProxyConfig newProxyConfig) {
        rebuildConfigInstances(newProxyConfig, true);
    }
This is sort of the equivalent to stroom's ConfigMapper class.
It holds the de-serialised config objects in a map that is then used to
provide them for guice injection.
stroom-proxy/stroom-proxy-app/src/main/java/stroom/proxy/app/guice/ProxyConfigProvider.java