Intellij Chinese characters work only on Windows theme

Hello,

Im writing regarding a problem that i'm facing while developing a plugin for IntelliJ. 

The problem reproduces in the following scenario. A ToolWindow is created for which i set the title which can be a name. This name sometimes can happen to be made of chinese glyphs. 

The name is displayed correctly on the Windows theme, while on the Darcula and IntelliJ themes it seems it does not know how to display the glyphs.

Windows theme:

Darcula Theme

For the IntelliJ theme it looks the same as for Darcula.

This is the code:

where ToolWindow its a class provided by IntelliJ api,

HasComponent.getComponent() returns a JPanel

workSpaceName is a string encoded with UTF-8

Any help is appreciated.

PS: *The problem is with the title of the ToolWindow and not the Backlog item.