Compile and execute Scala code at runtime

Question

Is is possible to compile and execute scala code as a string at runtime either in Scala or in Java?

My idea is to build a DSL using Scala then let Java programmers use the DSL inside Java.

I heard that the class scala.tools.nsc.Interpreter can do something like that, but when I imported it inside my scala file, I got "object tools is not a member of package scala."

So could anybody give me a hint?

Thanks for your quick response. I am coding in an Eclipse environment by the way. So do I need to download scala-compiler.jar then add it to the build path? Where can I find scala-compiler.jar? — Peter
– Peter, Commented Sep 19, 2011 at 21:42
In addition to tenshi answer, this should help you with examples of Interpreter usage. — om-nom-nom
– om-nom-nom, Commented Sep 19, 2011 at 21:44
@Peter: Yes, that's correct. Grab your version of scala here: scala-lang.org/downloads. Then unzip it and look in the lib folder. I also recommend you to look at sbt. I heard that it's eclipse integration improved lately. — tenshi
– tenshi, Commented Sep 19, 2011 at 21:47

Community · Accepted Answer · 2017-05-23 12:19:26Z

17

In 2.10.0 we expose Scala reflection API, which among everything else includes a runtime compilation facility. More details can be found here: Generating a class from string and instantiating it in Scala 2.10.

edited May 23, 2017 at 12:19

CommunityBot

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answered Sep 16, 2012 at 10:38

Eugene Burmako

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gerferra · Accepted Answer · 2011-09-20 02:36:13Z

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I recommend you twitter-util's Eval

answered Sep 20, 2011 at 2:36

gerferra

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Razvan Vacaru · Accepted Answer · 2022-07-28 14:43:14Z

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For scala3 this can be now achieved with dotty:

The sbt dependency is e.g. "org.scala-lang" %% "scala3-compiler" % "3.1.3"

answered Jul 28, 2022 at 14:43

Razvan Vacaru

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