Exception in thread "main" java.lang.NullPointerException
at java.lang.String.toLowerCase(String.java:2252)
at sun.font.FontManager.addToFontList(FontManager.java:550)
at sun.font.FontManager.registerFontFile(FontManager.java:823)
at sun.font.FontManager.registerFonts(FontManager.java:867)
at sun.java2d.SunGraphicsEnvironment.addDirFonts(SunGraphicsEnvironment.java:726)
at sun.java2d.SunGraphicsEnvironment.registerFontsInDir(SunGraphicsEnvironment.java:606)
at sun.java2d.SunGraphicsEnvironment.registerFontsOnPath(SunGraphicsEnvironment.java:626)
at sun.java2d.SunGraphicsEnvironment.access$600(SunGraphicsEnvironment.java:58)
at sun.java2d.SunGraphicsEnvironment$2.run(SunGraphicsEnvironment.java:400)
at java.security.AccessController.doPrivileged(Native Method)
at sun.java2d.SunGraphicsEnvironment.loadFonts(SunGraphicsEnvironment.java:389)
at sun.java2d.SunGraphicsEnvironment.getAvailableFontFamilyNames(SunGraphicsEnvironment.java:466)
at sun.java2d.SunGraphicsEnvironment.getAvailableFontFamilyNames(SunGraphicsEnvironment.java:498)
...