tree acd1bb57bd84d20eb55000801cbb428c3f8b6e29
parent 4cf769f8ee32bb3520604e4f3284e6f233f90276
author Stamatis Zampetakis <zabetak@gmail.com> 1639180991 +0100
committer Josh Elser <elserj@apache.org> 1639242446 -0500

[CALCITE-4931] Upgrade SLF4J binding to Log4j2 version 2.15.0

Log4j (binding) is used for testing purposes in various modules and
for production code (shaded) in standalone-server and tck modules.

1. Replace slf4j-log4j12 dependency (using Log4j 1.x)  with
log4j-slf4j-impl (using Log4j 2.x) and take latest version
2. Use XML syntax instead of property syntax for Log4j configuration. A
Log4j configuration is hierarchical by nature so formats with natural
support for nesting (such as XML) are easier to use.

Closes #164

Amending-author: Josh Elser <elserj@apache.org>