How to get client ip in a Java Servlet

req.getRemoteAddr();
req.getRemoteHost();

How to install Subversion on Eclipse in Snow Leopard

You must install Tigris Subversion, on Eclipse: Help -> Software Updates -> http://subclipse.tigris.org/update_1.6.x

And you need Java HL, to get this you can install Subversion binaries from http://www.open.collab.net/downloads/community/

 Restart Eclipse and voilá.

How to set default encoding in Eclipse

Window -> Preferences -> Workspace -> Text file encoding

How to know if i am working on development or production in appengine?

private boolean isDevelopment() {
        return ( SystemProperty.environment.value() == SystemProperty.Environment.Value.Development );

}

How to capture GET parameters in GWT

String param = Window.Location.getParameter("param");