For me, Go aside, I just don't want to deal with the JVM. Sure, VMs are great -- erlang has a nice one, iterations of the JVM are still nicer than they were circa 1998, etc. But, I've dealt with services web services in C/C++, PHP, Python, Go, Java, etc. 5-10 years ago, Java and it's assorted frameworks had it's place, but the intersection of Jetty, JBoss/Tomcat, Glassfish, and plain old Java apps muddied the waters about managing Java apps. If you use a framework, you will need to tweak memory settings to make sure things behave well.