Configure composite filter for specific logger in Log4j2 via properties file - log4j2

Question

Log4j2 provides various kind of filters [1] and these can be configured at four levels:
Context-wide
Logger
Appender
Appender Reference
In my use-case, I would like to setup a CompositeFilter at a specified Logger (level 2 from above) using the property file syntax.
For the sake of the example let's assume that we want to setup a composite filter composed from two RegexFilter matching .*SQL.* and .*JPQL.* respectively. Assuming that we have the following events:
logger.info("Messase with no keyword");
logger.info("Messase with SQL keyword");
logger.info("Messase with JPQL keyword");
logger.info("Messase with both SQL and JPQL keywords");
Only the last event should pass from the composite filter.
I made several attempts [2] (also outlined below) to get the desired output but I wasn't able to figure out how to properly setup a CompositeFilter using the property syntax so any help would be greatly appreciated.
Attempt 0
logger.t1.filter.f1.type = RegexFilter
logger.t1.filter.f1.regex = .*SQL.*
logger.t1.filter.f1.onMatch = NEUTRAL
logger.t1.filter.f1.onMismatch = DENY
logger.t1.filter.f2.type = RegexFilter
logger.t1.filter.f2.regex = .*JPQL.*
logger.t1.filter.f2.onMatch = ACCEPT
logger.t1.filter.f2.onMismatch = DENY
logger.t1.appenderRefs = a
logger.t1.appenderRef.a.ref = L0
Attempt 1
logger.t1.filters = f1, f2
logger.t1.filter.f1.type = RegexFilter
logger.t1.filter.f1.regex = .*SQL.*
logger.t1.filter.f1.onMatch = NEUTRAL
logger.t1.filter.f1.onMismatch = DENY
logger.t1.filter.f2.type = RegexFilter
logger.t1.filter.f2.regex = .*JPQL.*
logger.t1.filter.f2.onMatch = ACCEPT
logger.t1.filter.f2.onMismatch = DENY
Attempt 2
logger.t1.filters.f1.type = RegexFilter
logger.t1.filters.f1.regex = .*SQL.*
logger.t1.filters.f1.onMatch = NEUTRAL
logger.t1.filters.f1.onMismatch = DENY
logger.t1.filters.f2.type = RegexFilter
logger.t1.filters.f2.regex = .*JPQL.*
logger.t1.filters.f2.onMatch = ACCEPT
logger.t1.filters.f2.onMismatch = DENY
logger.t1.appenderRefs = a
logger.t1.appenderRef.a.ref = L0
Attempt 3
logger.t1.filter.M.type = Filters
logger.t1.filter.M.f1.type = RegexFilter
logger.t1.filter.M.f1.regex = .*SQL.*
logger.t1.filter.M.f1.onMatch = NEUTRAL
logger.t1.filter.M.f1.onMismatch = DENY
logger.t1.filter.M.f2.type = RegexFilter
logger.t1.filter.M.f2.regex = .*JPQL.*
logger.t1.filter.M.f2.onMatch = ACCEPT
logger.t1.filter.M.f2.onMismatch = DENY
logger.t1.appenderRefs = a
logger.t1.appenderRef.a.ref = L0
Some further clarifications:
I am strictly interested for setting up a CompositeFilter, not
write a custom filter, not use a single combined RegexFilter etc.
I am interested to see how it is done using the property syntax, not
XML, JSON, or other.
[1] https://logging.apache.org/log4j/2.x/manual/filters.html
[2] https://github.com/zabetak/logging-log4j2/commit/a9944885100db42f7e3ba1b3ff81d59b743d0ab7

Answer 1

There are two problems with your configuration:
A LoggerConfig accepts only a single filter. If you want to use multiple filters, configure a CompositeFilter explicitly (which has a plugin name "Filters),
The order of filters in a properties configuration file is basically random, since Properties is a Hashtable and does not have a predefined order.
Considering the two facts above a variation of your attempt 3 should work:
logger.t1.filter.M.type = Filters
logger.t1.filter.M.f1.type = RegexFilter
logger.t1.filter.M.f1.regex = .*SQL.*
logger.t1.filter.M.f1.onMatch = NEUTRAL
logger.t1.filter.M.f1.onMismatch = DENY
logger.t1.filter.M.f2.type = RegexFilter
logger.t1.filter.M.f2.regex = .*JPQL.*
logger.t1.filter.M.f2.onMatch = NEUTRAL
logger.t1.filter.M.f2.onMismatch = DENY
Both filters return NEUTRAL, when the pattern matches, which guarantees that an inversion of the order of filters does not break the logic.