How can I override a typesafe config list value on the command line?

java scala config typesafe
Michael Frank picture Michael Frank · Apr 24, 2013 · Viewed 13.7k times · Source

I have an application.conf file with a structure like the following:

poller {
  datacenters = []
}

I would like to override "datacenters" on the command line.

For other configuration keys whose values are simple types (strings, numbers) I can override using -Dpath.to.config.value=<value>, and this works fine.

However, I can't seem to find a way to do this for lists. In the example above, I tried to set "datacenters" to ["SJC", "IAD"] like so: -Dpoller.datacenters="['SJC', 'IAD']", but I get an exception that the key value is a string, not a list.

Is there a way to signal to the typesafe config library that this value is a list?

Answer

Patrik Nordwall picture Patrik Nordwall · Jun 4, 2013

An alternative syntax is implemented in version 1.0.1 for this:

-Dpoller.datacenters.0=SJC -Dpoller.datacenters.1=IAD

Related questions

How to use java.String.format in Scala?

I am trying to use a .format method of a string. But if I place %1, %2, etc. in the string, java.util.UnknownFormatConversionException is thrown pointing to a confusing Java source code piece: private void checkText(String s) { int idx; // If …

Read More
What are the best use cases for Akka framework

I have heard lots of raving about Akka framework (Java/Scala service platform), but so far have not seen many actual examples of use cases it would be good for. So I would be interested in hearing about things developers …

Read More
Add jars to a Spark Job - spark-submit

True ... it has been discussed quite a lot. However there is a lot of ambiguity and some of the answers provided ... including duplicating jar references in the jars/executor/driver configuration or options. The ambiguous and/or omitted details Following …

Read More