Critical Description
A specific set of parameterised logging messages produces an Array Index Out of Bounds exception. It occurs due to the params array (initially set to 10) being reset to a lower number due to a lambda function passed in as an parameter. Then the subsequent logging messages don't reset this number.
Best to explain in an example:
static Logger logger = LogManager.getLogger(); public static void main(String[] args) { logger.info("Hello {} {} {}", 1, 2,3); logger.info("Hello {}", () -> "World"); logger.info("Hello {}", 1); // Uncomment out this log event and the params gets reset correctly // No exception occurs // logger.info("Hello {}", 1); // Exception at this log event - as the params is set to 1! logger.info("Hello {} {} {}", 1, 2,3); }
Work around for this is not to use the ReusableParameterizedMessage. Instead to specify the legacy Message Factory of ParameterizedMessageFactory as a property of the program and no exception occurs.