Getting Logger Instance

Plexus Logger and LoggerManager can be injected in Plexus component using Plexus annotations

import org.codehaus.plexus.logging.Logger;
import org.codehaus.plexus.component.annotations.Component;
import org.codehaus.plexus.component.annotations.Requirement;

@Component( role = MyComponent.class )
public class DefaultMyComponent
    implements MyComponent
{
    @Requirement
    private Logger logger;

    @Requirement
    private LoggerManager loggerManager;
}

Starting with Maven 3.1.0, SLF4J Logger can be used directly too, without Plexus. Of course, this will only work when run under Maven 3.1.0, then this technique can be used safely only in Maven core components.

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MyClass
{
   final Logger logger = LoggerFactory.getLogger( MyClass.class );
}

Logger Name

Before Maven 3.1.0, with logging implementation done in Maven, logger name wasn't used: they are as-is, without clear definition.

Starting with Maven 3.1.0, logging implementation can be of greatest use if logger names are well defined. This definition still needs to be defined and implemented:

• classical "class name" pattern?
• Maven-specific name hierarchy?
• a mix (some with class name, some with Maven-specific hierarchy)?