This isn't a bug, so filing as a tweak. Everything compiles fine on the command line, and actually IntelliJ builds the project fine as well. But I get red squigglies in the code for TreeTableView and TreeTableCell due to some generic usages. I don't know if this is IntelliJ being odd, or if these are issues that javac (Java 7 update 10) isn't finding but will later. I've seen examples of both over the years. In any case the generic information isn't needed (in the case of TreeTableView), so removing some generic info fixes it. TreeTableCell actually gets happier by adding more generic info. There you have it.