Printing an array with slf4j only prints the first element

Question

I have the following code:

private static final Logger logger = LoggerFactory.getLogger(Some.class); ... String[] splits=someString.split(".."); logger.info("The string was split into <{}>",splits); // prints first element 

What is the right way to print the full content of an array with slf4j?

Answer 1

The issue is that with the following code

logger.info("The string was split into <{}>", splits); 

you are invoking the method info(String format, Object... arguments). Note that the last argument is a varargs. Therefore, the array you pass is interpreted as each argument of the variable argument.

However, in this case, you want to pass an array as first argument. A simple workaround is to cast it to Object.

String[] splits = { "foo", "bar" }; logger.info("The string was split into {}", (Object) splits); 

will log The string was split into [foo, bar], as expected.