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https://issues.apache.org/jira/browse/LOG4J2-1409?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Remko Popma reopened LOG4J2-1409:
---------------------------------

> 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
>            Assignee: Remko Popma
>            Priority: Critical
>             Fix For: 2.6.1
>
>
> 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:
> {code}
>     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);
>     }
> {code}
> 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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