Since JServer, the product name of the Java engine in the RDBMS, is bundled with the Oracle database, it's too early to tell how well the Java engine is selling. Product adoption looks strong from the announcements that I've seen, even reading between the lines, but it's early days so we'll just have to see how things pan out.
One correction, though. The HTML that gets sent back isn't the same as a screen refresh, since you get traffic only when you execute an action that causes the browser to go back to the web server for a new page. On a typical X-windows application, which is the only place I have expertise, even moving the mouse causes network traffic. In general, the network traffic volume will be lower for browser based applications than it will be for "X-windows-style" applications. The difference in traffic may be small enough to not matter, though.
In general the momentum in the enterprise software sector is toward this sort of browser-based application, if only because there is so much internet content that already uses browsers. That doesn't imply that there isn't room for alternatives, but I don't see anything dethroning the browser for the time being. (Remember, you're soaking in it now...) |