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, Sep 19 '11 at 21:42
In addition to tenshi answer, [this](http://stackoverflow.com/questions/1183645/eval-in-scala/6082750#6082750) should help you with examples of Interpreter usage. — om-nom-nom, Sep 19 '11 at 21:44
@Peter: Yes, that's correct. Grab your version of scala here: http://www.scala-lang.org/downloads. Then unzip it and look in the **lib** folder. I also recommend you to look at [sbt](https://github.com/harrah/xsbt). I heard that it's eclipse integration improved lately. — tenshi, Sep 19 '11 at 21:47

score 17 · Answer 1 · edited May 23 '17 at 12:19

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 '17 at 12:19

Community

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answered Sep 16 '12 at 10:38

Eugene Burmako

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score 8 · Answer 2 · answered Sep 20 '11 at 02:36

8

I recommend you twitter-util's Eval

answered Sep 20 '11 at 02:36

gerferra

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score 2 · Answer 3 · answered Jul 28 '22 at 14:43

For scala3 this can be now achieved with dotty:

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

Compile and execute Scala code at runtime

3 Answers3

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