Can we log from Sightly / HTL?

[lklement]

Looking at the list of HTL Global Objects in the documentation log is listed as a java-backed object backed by org.slf4j.Logger.

My question is, how can I use it?

I can't find any examples of it.

Thinking about it, this is a specific case of a more general question; How can I call methods and pass parameters to Java-backed objects?

I know it can be done when instantiating a Use-API object but that's not the pattern I'm after.

If it can't be done then it is hard to understand why the log and out objects are made available.

[smacdonald2008]

As stated in the docs - the log corresponds to the Java object. So you would use it in the front end like you would use it in the Java backend. ie

Java:

log.info("") ; 

Front end : 

"${log.info("")}

I have only used logging in back end - but this should work according to the docs. Also HTL spec here: 

https://github.com/Adobe-Marketing-Cloud/htl-spec/blob/master/SPECIFICATION.md

[Feike_Visser1 · Accepted solution]

You can't specify arguments like ${log.info("hello")}

You can only make log statements via Java or JS code.

[smacdonald2008]

We will ensure that this fact is placed into the AEM docs. 

[RajaShankar]

Adding to the Visser Statement

In Javascript which we call via sightly script add logs like

use(function() { log.error(“Log from Sightly JS Code");}

In Java Code

private final Logger log = LoggerFactory.getLogger(MyCustomClass.class);

private void mymethod(){

log.info("Event Path===>{}",evnt.getPath());

}