Either launch (other parameters omitted)--
DevMode -noserver -war /path/to/exploded_war
CodeServer -launcherDir /path/to/exploded_war
with /path/to/exploded_war being your build tool's output war directory or your GWT-Project/war folder. At work we do this for ages because we always use the exact same servlet container as we use in production. So we literally never used GWT's bundled jetty server.
What problems did you encounter? When coming from GWT 2.6 classic DevMode it should actually just work without any changes to your configuration.
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