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    <p>I'm not familiar with Logback, but a normal Akka application ships with default settings in its <code>reference.conf</code>, and you override these settings in an <code>application.conf</code>. It sounds like you want to add a <em>third</em> layer of configuration, which is certainly your right!</p> <p>The easiest way I can see is to change your <code>application.conf</code> to include your <code>foo.conf</code> rather than the other way around. That way Akka will load the <code>application.conf</code>, which will then load <code>foo.conf</code>.</p> <p>But that may not work if you need a differently-named conf file for each JAR distribution. In which case I recommend you look into <a href="https://github.com/typesafehub/config#merging-config-trees" rel="nofollow noreferrer">Merging Config Trees</a> to programmatically load and combine configuration. Actually, <a href="http://doc.akka.io/docs/akka/2.1.0/general/configuration.html#Reading_configuration_from_a_custom_location" rel="nofollow noreferrer">Reading configuration from a custom location</a> in the Akka Configuration docs is almost exactly what you want, except you will want to load <code>myConfig</code> from a classpath resource rather than by parsing a string (see the Typesafe Config docs to find out how to do that).</p> <p>Regarding the Logback configuration, like I said, I don't know Logback. But you can read values out an Typesafe configuration <a href="https://github.com/typesafehub/config#api-example" rel="nofollow noreferrer">like so</a>, and you can set the Logback root logger level <a href="https://stackoverflow.com/a/3838108/49630">like so</a>.</p>
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    1. POHow can I configure system properties or logback configuration variables from typesafe config?
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    1. USRich Dougherty
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    1. COThanks for the response! I have a pretty good handle on the cascading configuration options; what I'm unclear about is how to use typesafe config to set system properties, i.e. variables that I otherwise have to pass in using `-Dsome.variable=value`. I think if I can get over that hurdle for, say, `-Dfile.encoding`, it is likely to work for all the logback variable bindings.
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      1. USIan McMahon
    2. COThat's easy: just read the value out of the Typesafe Config file and then call `System.setProperty()`. But it might not work if the properties have already been read. System properties are usually best set on the command line. For runtime configuration it's better to use each framework's standard configuration approach.
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