https://igniterealtime.atlassian.net/browse/SPARK-731#icft=SPARK-731 is a duplicate. We are using that one instead of this one for now but referencing this one.

copied post from Vostok:
Synthetica FAQ: http://www.javasoft.de/jsf/public/products/synthetica/faq#q12
12. Chinese and Japanese characters won't get displayed?
This is a font issue and not a Synthetica issue. Synthetica's default font is set to "Tahoma", which does not
contain any Chinese or Japanese characters. The solution is to set the Default font to "Dialog"
as described here: FAQ Q3 and FAQ Q4.
4. How can I change the default font of the Synthetica Look and Feel?
import de.javasoft.plaf.synthetica.SyntheticaLookAndFeel;
import de.javasoft.plaf.synthetica.SyntheticaStandardLookAndFeel;
try { UIManager.setLookAndFeel(new SyntheticaStandardLookAndFeel()); SyntheticaLookAndFeel.setFont("Dialog", 12); } catch (Exception e) { e.printStackTrace(); }
So, your problem can be fixed by adding these fragment to Spark.java: 118.
-------------------- This should fix the "JID input box" which displays boxes for korean characters.

Hi Álvaro, "SPARK-218 Non-English characters not displayed in VCard with Spark" should solve the vcard issue. LG

It happens when you right click the user the select View Profile, if the profile has unicode characters, Spark will not show any field. I see this happening while pulling vcards from OpenLDAP (which is unicode).