"that's stupid" is a pretty broad statement. There are many reasons why one may choose to write new software in JS while taking advantage of existing investment in Java. If it doesn't make sense for you, don't do it. But for many it may.
As for coding Java on Nodyn, well, yes you can. That's kind of the point in some ways. You can write Java, package it as a jar and access this from Nodyn. Nodyn itself does this for the Buffer implementation.
Yes, vert.x already supports JS (I maintain the mod-lang-js, mod-lang-rhino and mod-lang-dynjs language modules for vert.x). The idea behind Nodyn is to provide drop-in Node.js compatibility in the Vert.x environment.
As for coding Java on Nodyn, well, yes you can. That's kind of the point in some ways. You can write Java, package it as a jar and access this from Nodyn. Nodyn itself does this for the Buffer implementation.
Yes, vert.x already supports JS (I maintain the mod-lang-js, mod-lang-rhino and mod-lang-dynjs language modules for vert.x). The idea behind Nodyn is to provide drop-in Node.js compatibility in the Vert.x environment.