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How to pass VertxOptions from command line (like worker threads)?

I'm talking about something like this:

java -jar fat.jar --workerThreads 40

or

vertx run server.js --workerThreads 40

There is no mention of that parameter in manual or API.

Is there any way to do this?

I know that there is an API:

var Vertx = require("vertx-js/vertx");
var vertx = Vertx.vertx({
    "workerPoolSize" : 40
});

But when I use that API I get warning from Vertx:

You're already on a Vert.x context, are you sure you want to create a new Vertx instance?

So I thinking I am doing something wrong...

Tereska
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1 Answers1

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You need to put it as a system property with a vertx.options prefix.

So for the fat jar it would be:

java -jar fat.jar -Dvertx.options.workerThreads 40

As for what properties you can set, anything that has a setting in VertxOptions has a corresponding property name: the setter name without the "set" portion.

For example, in code:

options.setClusterPort(5555)

is equivalent to 

-Dvertx.options.clusterPort

on the command line.

Be warned that the "vertx.options" part is case-sensitive.

Sam Sieber
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