Looks like broken/missing font configuration on your system
Quote:
java.lang.ClassCastException: sun.font.CompositeFont cannot be cast to sun.font.PhysicalFont
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try the following, close JDownloader and rename the folder /opt/jd2/jre
and then the launcher should use system installed java. Install java in case it's not yet installed.
Please report back in case that doesn't help.