LoggerFactory cannot getLogger

I'm currently implementing a Logger and I'm wondering why the code won't run. Most of the codes snipets are like these:

Logger log = LoggerFactory.getLogger(this.getClass());

My imported classes:

import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.service.log.LogReaderService;
import org.osgi.service.log.LogService;
import org.osgi.service.log.Logger;
import org.osgi.service.log.LoggerFactory;

But I can't seem to use getLogger.

Why is that?

Thanks in advance!

Here is the source code of org.osgi.service.log.LoggerFactory.

As you can see, it's an interface with no static methods therefore this code:

Logger log = LoggerFactory.getLogger(this.getClass());

is simply not valid.

To fix this use slf4j as front end (this means replace org.osgi.service.log.LoggerFactory import with org.slf4j.LoggerFactory etc.).

UPDATE

If you want to stick with org.osgi.service.log.LoggerFactory then follow this:

Obtain the LoggerFactory instance:

public class Activator implements BundleActivator
{
    private volatile LoggerFactory loggerFactory;

    public void start(BundleContext context) throws Exception 
    {   
        ServiceReference ref = context.getServiceReference(LoggerFactory.class.getName());
        if (ref != null)
        {
            loggerFactory = (LoggerFactory) context.getService(ref);
        }
    }

    //..

Elsewhere in the bundle you can then use the LoggerFactory to get a Logger for any class:

Logger logger = loggerFactory.getLogger(Foo.class);

UPDATE2

A better alternative would be to get a reference who's service type is LoggerFactory like this:

@Reference(service = LoggerFactory.class)
private Logger logger;