All the things you've mentioned involving dynamic typing, are not really a benefit. I much prefer the compile safety of strongly typed languages. GWT 2.7 has th

All the things you've mentioned involving dynamic typing, are not really a benefit. I much prefer the compile safety of strongly typed languages. GWT 2.7 has the same edit/refresh cycle, by the way (compiles have been optimized so they only take a couple of seconds). Lambdas and such are going to be added soon with Java 8 support.