This is not currently possible in an 'easy' manner. You could do it manually (avoiding the Undertow object and using XNIO + the listeners directly and writing your own code to handle this) however this is probably not what you are after. If you file a JIRA I should be able to get this into the next Undertow version. Stuart ----- Original Message ----- > From: "Oliver Dain" <oliver(a)analyticspot.com&gt; > To: undertow-dev(a)lists.jboss.org > Sent: Tuesday, 9 February, 2016 10:27:02 AM > Subject: [undertow-dev] Let undertow pick a port > > > > I'm trying to write some unit tests with an embedded undertow server. I’d > like to have the server find an open port. This makes the tests more robust > in many ways. For example, tests can be run in parallel and if a socket is > held in CLOSE_WAIT or something from a previous test the next test will > still run and succeed. With most servers I’ve used you can pass 0 for the > port and the server will find an open port. This doesn’t seem to be the case > with Undertow. Even if that would work, I don't see a method like getPort() > on the Undertow object so I don't know how I'd discover the port to which it > bound. Is this possible?? > > > Thanks, > Oliver > -- > CTO, Analytic Spot > 44 West Broadway #222 > Eugene, OR 97401 > analyticspot.com • 425-296-6556 > www.linkedin.com/in/oliverdain > > _______________________________________________ > undertow-dev mailing list > undertow-dev(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/undertow-dev