Just replace JDialog with JFrame

Sure - use a JFrame instead of a JDialog. The whole point of a JDialog
is to be dependent on a JFrame; What's the point of using a JDialog
without a JFrame?

...

Paul, "all costs" are not energy, and cannot be translated to energy. Most
of the costs associated with these systems are not energy costs at all but
manpower. The question is how can the manpower performing this action take
away enough of the energy to live better, and still have some left over for
the rest of us. The point, that it is possible for a power source to consume
more than it produces, is worth some thought. The electrical side of the
equation is pretty well established, I think. The PV cells do produce, in an
optimum environment, more energy than it takes to make em, and in a pretty
short time. The rest of the resources that have to be used up to make this
power however, are very substantial. Don persists in thinking that
collateral costs, as example a collateral cost for oil burning cars is some
areas where a few folk a year die of emphacema, can be amortized as KWH, or
even as dollars. The real problem is much more complex than this. In fact,
it is a big deal that we have no way to count "all the costs" for our oil
consumption, or even our oil nonconsumption, as in what happens in a few
years or when China gets it all and we become a third world country.

If you are using Java 1.4 or higher, you can use an undecorated
zero-size frame as the parent. I wouldn't leave such a thing up
permanently, but in your case you can close it after login.