How to override a Typesafe config via command line with -D

[l.a.derks]

I am trying to override a default config variable in my application.conf file.  

For example:

//application.conf

foo.bar = 50

Now I want to override foo.bar config via the command line like this:

`sbt -Dfoo.bar=100 run`

But it foo.bar keeps showing 50 instead of 100.

What am I doing wrong?

Everything works fine when I set an Environment Variable (FOO_BAR=200) and update foo.bar in application.conf like this:

foo.bar = ${?FOO_BAR} 

But the thing is I want to pass in the config via the command line. 

How can I do that?

[Nick Stanchenko]

Hi,

I think you want sbt -J-Dfoo.bar=100 run

Nick

[l.a.derks]

Hi Nick,

Thanks for you answer.

I just tried sbt -J-Dfoo.bar=100 run, but I keep getting the value 50 for foo.bar in my code. 

I'm using spray 1.3 by the way. Any other options?

[Nick Stanchenko]

Hmm, not sure why that happens, but anyway -J-D is the correct way to pass system properties to sbt, much like any Java settings (e.g. -J-Xmx).

You can check that the property is there by doing ConfigFactory.systemProperties.getInt("foo.bar").

Nick

[Oliver Ruebenacker]

Wouldn't you want quotation marks?

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Oliver Ruebenacker

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[Nick Stanchenko]

Works for me (in zsh) :)

sbt -J-Dfoo.bar=100 console

...

[info] Starting scala interpreter...

[info] 

Welcome to Scala version 2.10.5 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_45).

Type in expressions to have them evaluated.

Type :help for more information.

scala> com.typesafe.config.ConfigFactory.systemProperties.getInt("foo.bar")

res0: Int = 100

[Oliver Ruebenacker]

Maybe that depends on the shell?

[Nick Stanchenko]

Plausible, that’s why I specified mine.

Nick

[Chad Retz]

I ran into this as well: https://stackoverflow.com/questions/21389392/how-to-set-system-properties-for-runmain-on-command-line. It's a very untenable solution.

[Naftoli Gugenheim]

That's interesting because I'm pretty sure it works for me without the -J.

Which launcher script are you using (how did you install sbt)?

[l.a.derks]

Thanks for the help.

This is the one that works for me:

sbt ";set javaOptions in run +=\"-Dfoo.bar=600\"; run”

Thanks again!

[Nick Stanchenko]

@nafg: I used the debian package from http://www.scala-sbt.org/

@l.a.derks: You probably have “fork in run” set to true, right?

Nick