Can't render my persian unicode char..

I have installed on my windows persian truetype fonts.I am using jdk1.3.1.
JVM can render all those characters that are also available in arabic but
not the ones specific to persian. I dont know why please help me some one.

Thank you very much Martin.
The problem was really the font that did'nt contain many glyphs at all.I got some other fonts now.By the I have another question.How do people programme java chat.I mean the chat text that they display when someone enters his chat text.They display that text in many colors.TextArea can't display colorful text.If they are using TextPane etc,then it would be too difficult and some browsers won't support it at all.So what do they use for displaying those colorful texts in those nice and colorful chat applets.Thanks .......

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