Shahan created LOG4J2-1409:
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             Summary: ArrayIndexOutOfBoundsException in 
ReusableParameterizedMessage 
                 Key: LOG4J2-1409
                 URL: https://issues.apache.org/jira/browse/LOG4J2-1409
             Project: Log4j 2
          Issue Type: Bug
          Components: API, Core
    Affects Versions: 2.6
            Reporter: Shahan
            Priority: Critical


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.




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