Logback string length

I'm using logback to log to a rolling file in my Spring Boot service. In one of my classes, I am attempting to log a really long string (a string value of a very large object array that can have tens of thousands of elements).

log.info(str);

The above does not print, probably because the value of str is a very very long string.

//logback truncates the list - to preserve this we should record it in an audit table
            String rl = String.valueOf(reptIdList);
            String truncRlStr = rl.substring(0, Math.min(rl.length(), 100));
        log.info(truncRlStr);

The above does print. Probably because I'm truncating the very long string to 100 characters.

There is probably a limit to the length of the string in logback - is there a way to set it to maximum string length? I notice that there is no limitation on string length when logging into the console.

Thanks for any advice.