Printing an array with slf4j only prints the first element

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.