[jira] [Created] (LOG4J2-1415) When running in garbage-free mode, boxed primitive types should be formatted without allocating

["Anthony Maire (JIRA)" <ji...@apache.org>]

Anthony Maire created LOG4J2-1415:
-------------------------------------

             Summary: When running in garbage-free mode, boxed primitive types should be formatted without allocating
                 Key: LOG4J2-1415
                 URL: https://issues.apache.org/jira/browse/LOG4J2-1415
             Project: Log4j 2
          Issue Type: Improvement
    Affects Versions: 2.6
            Reporter: Anthony Maire
            Priority: Minor


When using Log4j 2 through the SLF4J binding, the Unboxer mecanism is not available and a parameterized message with a primitive type parameter will be auto-boxed.

Then this boxed value will be formatted by ParameterFormatter.recursiveDeepToString() and further allocations will happen

To lower allocation rate for SLF4J users, ParameterFormatter.appendSpecialTypes() should handle boxed primitive types too.

{code}

private static boolean appendSpecialTypes(final Object o, final StringBuilder str) {
    ...
    } else if (o instanceof Long) {
        str.append(((Long) o).longValue());
        return true;
    } else if (o instanceof Integer) {
        str.append(((Integer) o).intValue());
        return true;
    } else if (o instanceof Double) {
        str.append(((Double) o).doubleValue());
        return true;
    } // similarly for float, short, boolean and char.
    ...
}
{code}



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