+1 for vert.x it's based on the venerable Netty project and has extremely high performance, about as close to C as you can get besides maybe Golang Also DropWi

+1 for vert.x it's based on the venerable Netty project and has extremely high performance, about as close to C as you can get besides maybe Golang Also DropWizard is pretty quick and offers a good combo of features. Spring is the most feature complete, it's a shame it's so slow in comparison