记录器格式和throwable，slf4j，参数 [英] Logger format and throwable, slf4j, arguments

问题描述

在将某些旧记录器从String.format转换为较新的slf4j {}变体的过程中，我偶然发现了这种情况:

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);

我只想使用{}并删除String格式，但是， 包括throwable的logger方法签名是:

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)

所以在这种情况下我必须保留String.format吗?

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

为什么没有:

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

推荐答案

从SLF4J 1.6.0开始，在存在多个参数的情况下，如果日志记录语句中的最后一个参数是异常，则SLF4J将假定用户希望将最后一个参数视为异常，而不是简单参数.

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.

因此，编写(在SLF4J版本1.7.x及更高版本中)

So, writing (in SLF4J version 1.7.x and later)

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

将做您想实现的目标...

Will do what you want to achieve...

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