IntelliJ gets hosed on Fedora, and other 2.6 kernels: If you add jar files to a project, they appear to imported correctly, but then aren't visible, and browsing through them in the package explorer shows unnamed classes. Workaround: Close IntelliJ Edit your idea.lax in the bin directory, find the lax.nl.java.option.additional property, and append -Didea.jars.nocopy=true to the end of arguement list. Then delete the contents of $intellij/system/jars and $intellij/system/caches Restart, and you may need to recreate your project.