If you’re using Windows and running an X-server, such as XMing, and you’re willing to run the Oracle Installer, you might face the following warning:

“Warning: Cannot convert string “-*-lucida-medium-r-*-*-*-*-*-*-*-*-iso8859-1″ to type FontStruct”

Followed by a NullPointer Exception.

This is simply due to a missing font, all you need is to go download the XMing fonts package from SourceForge, e.g. http://sourceforge.net/projects/xming/files/Xming-fonts/7.5.0.34/Xming-fonts-7-5-0-34-setup.exe/download, install it, restart XMing and you’re ready to go.