Message interpolation and exceptions - problem

[zorba128]

Just noticed
val e = new RuntimeException(...)
log.info(s"exc: $e")
and
log.info(s"exc: ${e.toString}")
end up with different log messages.

Due to string interpolation conversion error, first one produces:
"exc: {}
java.lang.RuntimeException: Exception
at ...
"
Probbably $e is not treated as argument to slf4j's interpolation, but as exception argument.
So interpolation doesn't work, and one gets unwanted stacktrace.

marcin

[zorba128]

  val abc = "ABC"
  val ex = new RuntimeException("Exception")
  log.error(s"1: $ex")
  log.error(s"2: ${ex.toString}")
  log.error(s"3: $ex, $abc")
  log.error(s"4: $abc, $ex")

produces

[2020-04-30 12:12:39,376] ERROR [main] c.s.x.d.TestLogging:144 - 1: {}
java.lang.RuntimeException: Exception
	at ...
[2020-04-30 12:12:39,376] ERROR [main] c.s.x.d.TestLogging:145 - 2: java.lang.RuntimeException: Exception
[2020-04-30 12:12:39,377] ERROR [main] c.s.x.d.TestLogging:146 - 3: java.lang.RuntimeException: Exception, ABC
[2020-04-30 12:12:39,378] ERROR [main] c.s.x.d.TestLogging:147 - 4: ABC, {}
java.lang.RuntimeException: Exception
	at ...

We're using logback backend if that matters.