Thanks for your advice. However, in https://community.jaspersoft.com/sites/default/files/docs/jaspersoft_platform_support_v_7.1_0.pdf , page 12, at the bottom of the footnote, it mentioned that "14*JSS OpenJDK is not supported in Jaspersoft Studio". I not quite sure whether this constraint apply to Studio v6.6 or not. Although the document is for v7.1, I am now using Studio 6.6 as I could not find where to download Studio 7.1 and also I could not find the document for v6.6.