I am trying to create an Outbound call from google app engine using the Twilio Java helper library
Example:
private void createcall(HttpServletRequest r
Apparently twilio lib internally uses Apache HttpClient which need to be tweaked to be used on GAE: https://code.google.com/p/googleappengine/wiki/WillItPlayInJava#Apache
Not sure if you will be able to inject your own ClientConnectionManager
into Twillio lib though.
Update:
You can instantiate your own HttpClinet with tweaks to make it work on GAE and then inject it into twilio lib:
twilioRestClient.setHttpclient(gaeHttpClient);