• polyglot: supporting Java, Groovy, Ruby and JavaScript or a mix and match of any of these even in a single application
• simplicity: just a few lines of code to create your servers and components, without any XML configuration or anything like that, without being too simplistic
• scalability: with Netty under the hood, with a message passing approach, it's taking full advantage of the cores of your CPU(s)
• concurrency: vert.x provides a simple concurrency-model so you don't mess with traditional multithreaded programming

I am looking forward to meeting all the great people that make up the Groovy ecosystem. Everybody is always nice, friendly and ready to help. The atmosphere is always nice and laid back. 

The presentations always are high level and mostly done by the creators of the projects and frameworks. So the information is really from the source and that means you always get the latest information first at the conference.

If you are using Groovy, Grails, Gradle or any of the other Groovy-related technologies, or you plan to do so, you should really come to the conference. This is your chance to meet the people that create the great products and use it in their daily development. You will get inside information and experience real-life usage of these technologies.

After the conference you will be inspired and ready to apply your newly learned knowledge in your daytime job or projects.

// the function to run my groovy scripts
function! RunGroovy()
    // copy the current buffer file name in a variable
    let gfname=@%
    // open a new buffer in my window below
    botright new
    // define the buffer to be a mere scratch buffer not intended to be edited or saved
    setlocal buftype=nofile bufhidden=wipe nobuflisted noswapfile nowrap
    // create a temporaty file name to hold the output of the execution of my Groovy script
    let gtmpf = tempname()
    // define the command line to launch my Groovy script and retrieve its output in the temporary file
    let gcmd = ':!groovy ' . gfname . ' > ' . gtmpf
    // execute the groovy command
    silent execute gcmd
    // insert the content of the output from the temporary file in my buffer
    silent execute '0r ' . gtmpf
endfunction

// add F5 as the shortcut for executing my Groovy scripts
map   :call RunGroovy()

• without particular improvements (ie Groovy 1.7 and before), 
• with the primitive optimizations (Groovy 1.8), 
• and with static compilation.