Putting Logger.info in static block

Question

I have the following class

public class MyClass
{
    private static final Logger logger = Logger.getLogger(MyClass.class);

    static
    {
        logger.info("some text");
    }
}

Is it safe to assume that by the time we reach logger.info, the log4j system is initialized and is ready to emit logs?

It seems that if I am able to do a Logger.getLogger() and get back a valid Logger instance, it means that Log4j is initialized, right?

Answer 1

Yes, it is. Static initializers (that is, both static {} blocks and initial assignments to static variables) are executed in the order they are declared.

Default initialization of log4j relies on a static block in a log4j class LogManager that is executed once Logger class is loaded, and it is loaded prior to its first use. This is why your construction works.