How ${application.home} resolved in conf/logback.xml in play framework?

Question

I am using Play Framework 2.4. This is a part of the default conf/logback.xml file Play 2.4

<!--
  ~ Copyright (C) 2009-2016 Lightbend Inc. <https://www.lightbend.com>
  -->
<!-- The default logback configuration that Play uses if no other configuration is provided -->
<configuration>

  <conversionRule conversionWord="coloredLevel" converterClass="play.api.libs.logback.ColoredLevel" />

  <appender name="FILE" class="ch.qos.logback.core.FileAppender">
     <file>${application.home}/logs/application.log</file>
     <encoder>
       <pattern>%date [%level] from %logger in %thread - %message%n%xException</pattern>
     </encoder>
  </appender>
</configuration>

You can see full version from here. My question is how exactly that ${application.home} can be resolved? I read this answer, but didn't work.

The exact situation is when I removed ${application.home} from <file></file> tag, the logs folder will be created outside (in Parallel with) the dist(play-restful-docker-1.0-SNAPSHOT) folder. (in production)

I can add the dist-name (play-restful-docker-1.0-SNAPSHOT) replacing ${application.home} and it creates logs folder inside the dist and works perfect. But it is not a good practice since it will have to be changed per every new version.

Can you give an example of what you are trying to achieve (ex: logs are placed in x/y/z, I want them at x/k/m)? — Salem
– Salem, Commented Jun 13, 2016 at 19:51
I am trying to add a log file (inside <appender> tag), which keeps all the logs as the application up and running. — Supun Wijerathne
– Supun Wijerathne, Commented Jun 15, 2016 at 3:34

Phransys · Accepted Answer · 2017-11-16 14:14:04Z

1

You could create your own conf/logback.xml and override the default one. The additional ":-." after application.home will cause it to default to the current directory if application.home is not defined. The default logback.xml of Play 2.5 does this automatically.

<configuration>    
  <conversionRule conversionWord="coloredLevel" converterClass="play.api.libs.logback.ColoredLevel" />    
  <appender name="FILE" class="ch.qos.logback.core.FileAppender">
     <file>${application.home:-.}/logs/application.log</file>
     <encoder>
       <pattern>%date [%level] from %logger in %thread - %message%n%xException</pattern>
     </encoder>
  </appender>
</configuration>

answered Nov 16, 2017 at 14:14

Phransys

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