How does codeserver parameter in GWT work?

n GWT in order to run the application in hosted mode "dev mode" you append get.codesvr parameter to the url as you can see below.

/?gwt.codesvr=127.0.0.1:9997

First question is I want to know how does GWT know when to start a JVM instance to serve .class files instead of compiled JavaScript files? I can't seem to find how GWT works in dev mode. I do find main( ) in com.google.gwt.devDevMode. How does this main( ) be called?

Second question is in the documentation it says that GWT devmode run with Jetty server, however I see actual JavaScript in browser. How does this jetty server outputs JavaScript from .class files of the client side code?

Thanks.

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