Using RoutingAppender in commerical product programmatically - log4j2

Question

I have a commerical product, using log4j2 internally.
I can add java/groovy script as an internal api. Here I can also use log4j2 as logger
Each script is running within a thread.
The logging for each of the scripts, I want have a own logfile (and all subordinate loggers)
Before I start within the product, I was playing with Log4J2 locally, using the RoutingAppender examples.
RoutingAppender: it works as expected when I have a log4j2.xml during startup.
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="INFO">
<Appenders>
<Console name="STDOUT" target="SYSTEM_OUT">
<PatternLayout
pattern="myCONSOLE - [%d] [%-5p] [%-7t] - %m%n" />
</Console>
<Routing name="Routing">
<Routes pattern="$${ctx:ROUTINGKEY}">
<Route>
<RollingFile name="Rolling-${ctx:ROUTINGKEY}"
fileName="logs/test-${ctx:ROUTINGKEY}.log"
filePattern="./logs/test-${ctx:ROUTINGKEY}-%d{yyyyMMdd}-%i.log.gz">
<PatternLayout>
<pattern>%d{ISO8601} [%t] %p %c{3} - %m%n</pattern>
</PatternLayout>
<Policies>
<TimeBasedTriggeringPolicy interval="6"
modulate="true" />
<SizeBasedTriggeringPolicy size="10 MB" />
</Policies>
</RollingFile>
</Route>
</Routes>
</Routing>
</Appenders>
<Loggers>
<Root level="ALL">
<AppenderRef ref="STDOUT" />
<AppenderRef ref="Routing" />
</Root>
</Loggers>
</Configuration>
In the code I use parts as:
In the script script (simulated), I do ThreadContext.put("ROUTINGKEY", "exampleA"); , in a second script I use "exampleB".
In main programm I set:
static {
System.setProperty("isThreadContextMapInheritable", "true"); // So all objects/loggers in same thread will inherit the ThreadC
}
Other classes/objects are created as usual with normal logger technique: private static Logger logger = LogManager.getLogger(Grassfrosch.class);; and using logger.info....
All logging was in correct logfile including the subordinate elements.
Back to the commerical product. Here I want to add the RoutingAppender (and the RollingFileAppender) dynamically with programming code in the groovy scripts.
Script "exampleA" should add the route for the own part by itself
Script "exampleB" should add the route for the own part by itself
I don't want to use the product config file itself due to product upgrades/patches, overwritten by the manufacturer.
So, I also implemented locally such logic "programmatically approach".
I create a FileAppender/RollingFileAppender
I create a Routes plus Route(s) object
I create a RoutingAppender, adding the routes etc.
Simplified code is:
private void fragment() {
Configuration cfg;
org.apache.logging.log4j.core.Logger rl = (org.apache.logging.log4j.core.Logger) LogManager.getRootLogger();
cfg = rl.getContext().getConfiguration();
String name = "exampleA";
PatternLayout layout = PatternLayout.newBuilder().withPattern("DYNAMIC[" + name + "] - %d [%p] - %m%n").build();
FileAppender fileAppender = FileAppender.newBuilder() //
.setName("FileAppender-" + name).withFileName("logs/FileAppender-" + name + ".log") //
.withAppend(true).setLayout(layout) //
// .setConfiguration(cfg)
.build();
fileAppender.start();
rl.addAppender(fileAppender);
Route route01 = Route.createRoute("FileAppender-" + name , name, null);
Routes routes = Routes.newBuilder().withPattern("$${ctx:ROUTINGKEY}").withRoutes(new Route[] { route01}).build();
RoutingAppender routingAppender = RoutingAppender.newBuilder().setName("EPI-Routing").withRoutes(routes) //
.setConfiguration(cfg) //
.build();
routingAppender.start();
rl.addAppender(routingAppender);
rl.getContext().updateLoggers();
}
With this code, both scripts "exampleA" and "exampleB", will written to both logfiles "FileAppender-exampleA" and "FileAppender-exampleB" and not as expected in the "log4j2.xml" example.
I guess, the problem is:
I have to add a FileAppender to existing configuration
due to I have to "reference" Route.createRoute.
Finally the FileAppender I have added to rootlogger (wrong).
I also try to add to script logger, but no success.
I stuck. Any hints?
Uwe