Getting the height of a font

Hi there,
I have a problem in determining the exact height of a font.
I am using a JPanel to display some text in a GUI. The panel should have space for five lines of text. How can I determine the size of the font before the Frame that is containing my GUI is shown, so that I can set the size of the JPanel to the appropriate size?
I've tried
FontMetrics metrics = getFontMetrics(getFont());
int lineHeight = metrics.getAscent() + metrics.getDescent();
But this produces a NullPointerException on runtime.
Does anyone know another way to get the height of a font before the frame is shown?
Thank you,
FReAK

Ok,
I figured out that the problem is that getFont() gets null as font.
So if I use setFont() everything is fine.
But I don't have to set a specific Font when drawing a String, so is there must be a standard Font.
Does anyone know how to get the metrics of this font?

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