I'm new JAVA developer, I want to log in my code. What is the best practice

[Benjamin_Jalon1]

I create a listener and I want to in logs information of the document.

Here is my code:

public class MyListener implements EventListener {
    public void handleEvent(Event event) throws ClientException {
        EventContext ctx = event.getContext();
        DocumentEventContext docCtx = (DocumentEventContext) ctx;
        // Here log doc title
    }    
}

What is best practive ?

[Benjamin_Jalon1 · Accepted solution]

Nuxeo uses the Log4J framework.

First you must add this static attribute:

 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;

 public class MyListener implements EventListener {

     private static final Log log = LogFactory.getLog(MyListener.class);

And use it to log your messages:

log.info("your message");

Choose a log level between fatal, error, warn, info, debug and trace.

Please see that thread and How to configure Nuxeo logging documentation.

Logging SomeException will look like:

catch (SomeException e) {
    log.error(String.format("Failed with transition %s on doc %s", transition, doc.getId), e);
}

Important: don't let the default logging suggested by your IDE:

e.printStackTrace();