Chinese is shown as small box when using english as ui language within java application?

For example,with in use case diagram,I input chinese "重组分析数据集" within a use case's ellipse icon,and it is shown fine,but when I "open use case details.. ","重组分析数据集" will be shown as small boxes in name text box,and if I copy these boxes into chrome's location bar,it shows as "重组分析数据集".And if I switch vp's UI language to chinese,everything shows fine.So,how to make vp shows chinese consistently when it works under English UI?

enter image description here

Solution

It turns out that the font I chose doesn't support chinese.