#6 thailand language support ?

[gu Ken]

Hi all, I am using ujac library to create pdf , based on xml files and data mapping. However , I found I cannot write on thailand language in xml files. If I write on following characters
<font-def name="header-big-bold" family="Helvetica" style="bold" size="16" />
<paragraph font="normalsmall">กู๊ดเยียร์ทำบุญเลี้ยงพระต้อนรับรูปโฉ</paragraph>

There will be errors, for english language, it works fine.

My question is: Is ujac support thailand language ? How to implement such thailand langauge pdf

I have itext.jar in my project library