Can’t remember the source, but the top online language was PHP, and offline is C .
Java has been on the decline in terms of true usage for years, and is usually used only certain Windows open source projects, while most other OSS software is in C, and the great majority of all commercial/business applications are in C .

Look at the facts: the official libraries for the big stuff (Windows API, Wine, DirectX, OpenAL, network stacks, basically anything that you would use to code) is in C .

At best, Java is used to create proprietary solutions to framework-less applications — for instance if you want to use existing programs/command-line scripts and a GUI to it, or anywhere where you aren’t technically coding the libraries themselves in Java, it’s an OK language and the easiest (well.. now that there is J# and C# that’s debatable) to use – but if you have to write/use libraries directly, it’ll result in more work.

The most important thing to look at on that ‘index’ is the source of the info: namely, the ‘professionals’ in those fields. That’s a very biased look at the languages, Java is required learning material for any college or university, and it’s easier than the other language: C. Java is everyone’s strong language, but that doesn’t make it the language of applications today.