Running JS code on a server

Ben Evans benjamin.john.evans at
Mon May 1 17:56:01 UTC 2017

Hi Eliezer,

It's not Nashorn, but last year I wrote a deterministic execution
framework based on a custom rewriting classloader and some runtime

There's an article I wrote about it here:

and the code is available here:

If you wanted to take a look & see if it meets your needs, I'd be
happy to help you (but we should probably discuss directly, as it's
not really Nashorn-relevant).



On Mon, May 1, 2017 at 1:55 PM, Jim Laskey (Oracle)
<james.laskey at> wrote:
> From: Eliezer Julian <Eliezer.Julian at <mailto:Eliezer.Julian at>>
> Subject: Running JS code on a server
> Date: May 1, 2017 at 6:28:05 AM ADT
> To: "nashorn-dev at <mailto:nashorn-dev at>" <nashorn-dev at <mailto:nashorn-dev at>>
> Cc: Elior Apelbaum <Elior.Apelbaum at <mailto:Elior.Apelbaum at>>, Moshe Robinov <Moshe.Robinov at <mailto:Moshe.Robinov at>>, Chen Malka <chen.malka at <mailto:chen.malka at>>
> Hi,
> I am developing a server side application and would like to add a feature that allows a user to submit JS code to be executed via Nashorn. My concern is that a user may submit malicious code that may compromise the server. I have already limited the script’s access to the bare minimum of Java classes, and have implemented a mechanize to kill the script if execution time runs over a certain limit. I have also manually removed many of the special methods such as print, echo, exit and quit from the Bindings object. However, this is extremely limited in scope compared to the damage a willfully malicious user may be able to effect via this feature (such as allocating too much memory, try to access the file system via the script, etc.). I was wondering if the Nashorn development team had any recommendations as far as security is concerned, and whether there are any plans to add additional security features in the future.
> Thanks,
> Eli Julian
> Software Developer
> Decision Division
> Email: eliezer.julian at <mailto:eliezer.julian at>
> Office: +972-3-7902155
> Mobile: +972-50-3697238
> Skype handle: eli_julian
> Visit us at: <>

More information about the nashorn-dev mailing list