Enable logging in external library

Question

I am using retrofit library from square(added as a jar dependency), which has a logger configured. (link)

  private static final Logger LOGGER = Logger.getLogger(RestAdapter.class.getName());

How can I enable logging in this library (from my application).

I see check like this

if (LOGGER.isLoggable(Level.FINE)) {
          logResponseBody(url, body, statusCode, elapsedTime);
        }

so it looks like, I may have to get this logger and set the log level. Or does java logger read loglevel setting from config file, environment, class path ??

I am not familiar with java platform. Any help to log the messages from this (external) library in console is appreciated. For example, I need to see all the log message from this class (RestAdapter) in my android console / logCat (which is set at verbose level).

thanks.

EDIT 1:

I added the below to my entry point, and I could see it is been called. Still no relavent log

static final String LOGGER_NAME = "retrofit.http.RestAdapter";

@Override
    public void onCreate() {
        super.onCreate();
        Logger mLoggerInstance = Logger.getLogger(LOGGER_NAME);
        if (mLoggerInstance != null) {
            mLoggerInstance.setLevel(Level.FINE);
        }
    }

EDIT 2:

I edited the external library to change reference of loglevel FINE to DEBUG. THis let me see the log, still wonder the same effect can be achieved through logger configuration alone.

I see a post here, but didn't work. Logging with Logger under Android

Not certain, but it looks like the debug level below Debug is suppressed in Android. (source)

Answer 1

This is Java Logging API. By default it uses global jre/lib/logging.properties config file. You can copy it to your application folder, change it and pass it as java arg

java -Djava.util.logging.config.file=logging.properties ...

read Oracle's overview http://docs.oracle.com/javase/7/docs/api/java/util/logging/package-summary.html or this article http://tutorials.jenkov.com/java-logging/configuration.html for mmore details