1.) You are only able to run ResultSet rs = stmt.executeQuery(whereClause); on the server. To tell the server to execute this line you need a RPC call from the client to the server. So this line can actually never execute before a RPC call because a RPC call is needed to tell the server to execute it!
2.) You should never generate a query on the client side (= in the browser) and then send it to the server and execute it. You dont have any control of the client browser and an attacker can send you any query, even DROP DATABASE, if your server blindly executes the query received from the client.
3.) An incremental command is used to split a computation heavy task into multiple smaller steps. Between these steps the browser has time to do other work and thus you browser does not block (JavaScript is executed in a single Thread). If you ever need an incremental command then its very likely that you need it inside an AsyncCallback.onSuccess() method.
4.) If you can (depends on your GWT version) use Scheduler.get(). instead of DeferredCommand.addCommand() because the latter is deprecated in newer GWT versions.
-- J.
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