Logger format and throwable, slf4j, arguments [duplicate]

Question

In the process of converting some old loggers from String.format to the newer slf4j {} variant, I stumbled upon this case:

logger.error(String.format("%s ... %s ... %s", ...), e); 

I would like to use only {} and remove the String format, however, the logger method signature which includes the throwable is:

error(String msg, Throwable t)

So I do have to keep the String.format in this case ?!

Why is there no:

error(Throwable t, String format, Object... arguments)

Answer 1

As of SLF4J 1.6.0, in the presence of multiple parameters and if the last argument in a logging statement is an exception, then SLF4J will presume that the user wants the last argument to be treated as an exception and not a simple parameter.

So, writing (in SLF4J version 1.6.x and later)

logger.error("one two three: {} {} {}", "a", "b",            "c", new Exception("something went wrong")); 

http://www.slf4j.org/faq.html#paramException:

"Yes, as of SLF4J 1.6.0, but not in previous versions. The SLF4J API supports parametrization in the presence of an exception, assuming the exception is the last parameter."