How to inject and run Scala code in a running JVM

Question

Is it possible to compile & run scala code dynamically within Java code.

It is possible to achieve a similar result with JS using mozilla rhino. But, I wonder if it is possible with scala?

Maybe this answer will help: https://stackoverflow.com/a/39139732/2266098 — NeplatnyUdaj, Aug 02 '19 at 12:56
First, let me say that I agree with GhostCat. But, have you considered using [**Zeppelin**](https://zeppelin.apache.org/)? — Luis Miguel Mejía Suárez, Aug 02 '19 at 13:32

score 1 · Answer 1 · answered Aug 02 '19 at 12:57

Theoretically, yes. But you will need to do a lot of things:

ensure the user entered valid scala code
transfer that source code to the server
compile the scala code
run it from within your server (catch errors, deal with resource leaks, ...)

So, possible: yes. Reasonable: not so much.

Obviously: a lot of work
getting to a decent user experience: even more work (like: telling the user exactly where in his source code input your compilation step found a bug ... hard)

And of course: opens your system for a ton of attack vectors.

If you want your users to be able to run code on the backend server, one wonders: why don't they have admin access to that machine already, and are able to deploy there code right there on the server themselves?!

Sure, Scala has its REPL, and as that one comment pointing to an existing answer implies: it is definitely possible to do that.

But as said: we don't do things because we can, but because it makes sense doing it!

score 0 · Accepted Answer · answered Aug 09 '19 at 08:07

0

twitter util-eval library seems provide what I need, but it is discontinued.

Here is an old fork: https://github.com/m3dev/twitter-util-eval

answered Aug 09 '19 at 08:07

aunlu

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How to inject and run Scala code in a running JVM

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