Hi, oVirt UI currently uses GWT SDK version 2.6.1 In GWT 2.6.x "classic" dev mode is still the default one. We tried to use "super" dev mode some time ago [1] but it didn't work for us, probably due to using direct-eval RPC mechanism (we got HTTP 500 responses for RPC requests). [1] https://gerrit.ovirt.org/#/c/26093/ Because "classic" dev mode relies on NPAPI-based browser plugin, the downside is that developers must use old'ish browsers that still support NPAPI (Firefox <= 26 etc). I think we can revisit this and try to experiment with "super" dev mode as I believe [1] was done in context of GWT 2.5.x anyway. Regards, Vojtech ----- Original Message -----