topic How can I run a scala command line in databricks? in Data Engineering

How can I run a scala command line in databricks?

pret — Tue, 04 Oct 2022 09:39:00 GMT

I wish to run a scala command, which I believe would normally be run from a scala command line rather than from within a notebook.

It happens to be:

scala [-cp scalatest-<version>.jar:...] org.scalatest.tools.Runner [arguments]

(scalatest_2.12__3.0.8.jar is included within the databricks runtime)

Can this be run within a scala notebook from databricks, or by some other means within databricks, eg (and ideally) as a job?

I have tried various ways of running this command from within a notebook without success. I'm not sure if its possible or if I need to structure the syntax in such a way for it to work.

Thanks

Re: How can I run a scala command line in databricks?

pret — Thu, 06 Oct 2022 09:57:53 GMT

Hi @Debayan Mukherjee , thanks, I understand I can write Scala scripts in the notebook, which I already do, but I'm not sure how I can run a scala command line command in databricks? For example, using a 7.3 LTS runtime and the following scala in a notebook:

import org.scalatest._
import org.scalatest.tools.Runner
 
class DBtestSuite extends FeatureSpec with GivenWhenThen {
 
  feature("feature...") {
    scenario("scenario...") {
      Given("given...")
      When("when")
      Then("then...")
      assert(1==2)
    }
  }
}
 
scala -classpath "scalatest_2.12__3.0.8.jar" org.scalatest.tools.Runner -s DBtestSuite

results in error:

error: ';' expected but string literal found.
scala -classpath "scalatest_2.12__3.0.8.jar" org.scalatest.tools.Runner -s DBtestSuite

Re: How can I run a scala command line in databricks?

Anonymous — Thu, 03 Nov 2022 03:49:01 GMT

Hi @David Vardy

Hope all is well! Just wanted to check in if you were able to resolve your issue and would you be happy to share the solution or mark an answer as best? Else please let us know if you need more help.

We'd love to hear from you.

Thanks!

Re: How can I run a scala command line in databricks?

Debayan — Thu, 06 Oct 2022 08:15:55 GMT

Hi @David Vardy , from notebooks you can try using Scala, ref: https://docs.databricks.com/notebooks/notebooks-use.html#mix-languages.

You can use the language magic command %<language> at the beginning of a cell. The supported magic commands are:

%python

%scala

%sql

Re: How can I run a scala command line in databricks?

Debayan — Thu, 06 Oct 2022 13:09:17 GMT

@David Vardy Could you please check if this helps:

https://databricks-prod-cloudfront.cloud.databricks.com/public/4027ec902e239c93eaaa8714f173bcfc/7658591944105421/3162710545890990/6751888352535706/latest.html

https://docs.databricks.com/languages/scala.html

Also, the knowledge base: https://kb.databricks.com/scala/index.html?_ga=2.90545306.1490214985.1664985187-643525343.1663499643