Setting logback.xml path programmatically

Question

I know I can set the logback.xml path like this:

Specifying the location of the default configuration file as a system property

You may specify the location of the default configuration file with a system property named "logback.configurationFile". The value of this property can be a URL, a resource on the class path or a path to a file external to the application.

java -Dlogback.configurationFile=/path/to/config.xml chapters.configuration.MyApp1 

but how can I do it in code?

Answer 1

LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory(); loggerContext.reset(); JoranConfigurator configurator = new JoranConfigurator(); InputStream configStream = FileUtils.openInputStream(logbackPropertiesUserFile); configurator.setContext(loggerContext); configurator.doConfigure(configStream); // loads logback file configStream.close(); 

Answer 2

You could use:

System.setProperty("logback.configurationFile", "/path/to/config.xml"); 

But it would have to happen before logback is loaded, i.e. something like:

class Main {   static { System.setProperty("logback.configurationFile", "/path/to/config.xml");}   private final Logger LOG = LoggerFactory.getLogger(Main.class);    public void main (String[] args) { ... } } 

Note: I have not tested it but it should work.