[SOLVED] How can i append the username (principal) to each log line in Wildfly?

How can i append the username (principal) to each log line in Wildfly?

I am working with Wildfly 10 and I am using its logging subsystem.

Now, I need to append the LoginName of the currently logged in User (principal) from the session to every log message that is processed by the JBoss Logging Subsystem.

Is there a generic way to do this, rather than appending the UserName to every Log Message in my Application?

For example i could do:

        HttpServletRequest request = (HttpServletRequest)externalContext.getRequest();
        UserModel user = (UserModel)request.getSession().getAttribute("user");
        String username = user.getName();

But how can i get the Logging Subsystem to do this for every Log Message?

Solution

As James R. Perkins suggested, this can be done be using MDC (Mapped Diagnostic Context).

An example of how this works can be found here: https://veerasundar.com/blog/2009/11/log4j-mdc-mapped-diagnostic-context-example-code/