CODEWITHSUNDEEP
scalasbt
Karthik Chandraraj
Karthik Chandraraj

Reputation: 1041

Scala sbt console - code changes not reflected in sbt console

I use scala sbt console to test my methods. (commands : sbt then console) But the code changes done in eclipse or other external editor, are not getting reflected in the sbt console.

Every time, I have to quit the console (using Crt + D) and again start it using console command to see the changes.

Any one facing this problem? Is there any ways to reload the code from console?

I am using Ubuntu 64-Bit,

Upvotes: 42

Views: 13363

Answers (2)

Sean Parsons
Sean Parsons

Reputation: 2832

Not without using something like JRebel, mostly because class definitions could break in such a way as to make instances already loaded unusable. The only suggestion I have is to run the console with ~console so that if changes have been made they will be recompiled and the console re-entered.

Also if you're regularly running a set of commands the initialCommands sbt setting configures commands to be run immediately after starting the console.

Upvotes: 35

Bozhidar Batsov
Bozhidar Batsov

Reputation: 56595

One option is to use :restart in the console - this will reload it and replay all the commands you've entered so far.

For a better solution you might want to read my blog post on incremental development with JRebel & Scala.

You should modify the sbt startup script like this:

#!/bin/bash

java -noverify -javaagent:/home/username/path/to/jrebel/jrebel/jrebel.jar
 -Drebel.lift_plugin=true -XX:+CMSClassUnloadingEnabled
 -XX:MaxPermSize=512m -Xmx512M -Xss2M -jar `dirname $0`/sbt-launch.jar
 "$@"

When you start the REPL from inside SBT, for instance with the command:

sbt console

changes to the imported classes will be reflected automatically without the need to do a :replay or restart the REPL - something reminiscent of the interactive Lisp programming.

Upvotes: 20

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