Where to define a static application logger?

Question

I have several packages in my Java web application. In some of them, I use this construct:

public class Foo {
  private static Logger logger = LoggerFactory.getLogger("com.XXX");
  public void bar() {
    Foo.logger.debug("Method bar() was just called");
  }
}

Of course, this is just an example. Everything works fine, but I don’t like the idea of ​​initializing the log in many classes. This is an obvious duplication of code. I would like to move it to some helper class and allow all other classes to access it. Is this the right idea? Or maybe there is another “best practice” or pattern?

Answer 1

, . :

public class MyLogger {
  private static Logger logger = LoggerFactory.getLogger("application");

  public static void debug(String s) {logger.debug(s));}

  public static void debug(Class<?> caller, String s) {
     LoggerFactory.getLogger(caller.getName()).debug(s);
  }

  // ...
}

:

import static MyLogger.*;

public class Foo {
  public void bar() {
    // makes use of static import!
    debug("Method bar() was just called"); 
    debug(this.getClass(), "Method bar() was just called"); 
  }
}

​​ debug delegate, Logger.

Answer 2

, , , import java.util.* 75% - . public class .... . .

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Answer 3

, -, logger constrcut, Log4J/inits.

private static Logger logger = LoggerFactory.getLogger("com.XXX");
logger.info("Hello World");

-

GlobalLogger.info(this, "LogMessage");  //Singleton...

... "".

Answer 4

, Log4j ( , ), . , , .

Answer 5

(.. Log4j) .

, Log4j NextBigThingLogger, MyLogger .

.

API Apache Java " ", , .

Answer 6

, . Java-, google:

http://www.javacoffeebreak.com/articles/designpatterns/index.html

Answer 7

. , . Singleton.

public class LoggerAdapter extends Logger {
    private LoggerAdapter instance;
    private Logger logger;

    private LoggerAdapter() {

    }

    public static LoggerAdapter getInstance(Clazz<?>  clazz) {
        if (instance == null) {
            instance = new LoggerAdapter();
        }
        instance.logger = logger = LoggerFactory.getLogger(clazz.getName());

        return instance;
    }

    @Override
    public void trace(Object object) {
        logger.trace(object);
    }

    //Other overridden methods here...
};

, ....