Due to curiosity, I checked how autobeans are generated. I found it uses sun.misc.ProxyGenerator class to generate autobean proxies and that it uses reflections. But I do not understand, how does it work on client-side. Are those methods that use reflections compiled to javascript? Does it mean that I can use reflections myself on the client?
Google Web Toolkit Autobeans
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Proxy instances are only used on the server, in a real JVM, where reflection works. You are correct that GWT code cannot use general reflection.
To generate them on the client, a GWT Generator is used instead. This does all of the reflection while the GWT Compiler is still running, and so is in a real JVM, and creates new classes that implements your autobean interfaces and factories.
The
com.google.web.bindery.autobean.gwt.rebind.AutoBeanGeneratorclass is mostly responsible for this work, and the contents of thecom.google.web.bindery.autobean.gwt.rebind.modelpackage (and, to a degree,com.google.web.bindery.autobean.shared) assist in this work.