Currently the log4j-jdbc appender has an optional dependency on log4j-jndi.

In order to remove this optional dependency, I propose to:

• create a new module log4j-jdbc-jndi and depends on log4j-jdbc and log4j-jndi and contains the DataSourceConnectionSource and inlined code from JndiUtil,
• remove the dependency on log4j-jndi from log4j-jdbc.

From a user perspective:

• most users will require just the log4j-jdbc-dbcp2 module,
• some Java EE/Jakarta EE users will require the log4j-jdbc-jndi module,
• the log4j-jdbc module could be considered as an internal dependency.