How to create a PropertyDefiner?

[Pesegato]

Hi,
I want to create a custom PropertyDefiner, as described here:

https://logback.qos.ch/manual/configuration.html#definingPropsOnTheFly

So I created this class:

https://github.com/Pesegato/MonkeyLog/blob/main/src/main/java/com/pesegato/monkeylog/MonkeyLog.java

Then I try to use it with this:

<configuration debug="true">

  <import class="com.pesegato.monkeylog.MonkeyLog"/>
  <define name="savefolder" class="PropertyDefiner">
  </define>
  <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>${savefolder}/log/mylog.log</file>
...

But it doesn't work and at runtime I get this exception:

Failed to instantiate [ch.qos.logback.classic.LoggerContext]
Reported exception:
java.lang.NoSuchMethodError: ch.qos.logback.core.util.Loader.getResourceOccurrenceCount(Ljava/lang/String;Ljava/lang/ClassLoader;)Ljava/util/Set;
	at ch.qos.logback.classic.util.ContextInitializer.multiplicityWarning(ContextInitializer.java:160)
	at ch.qos.logback.classic.util.ContextInitializer.statusOnResourceSearch(ContextInitializer.java:183)
	at ch.qos.logback.classic.util.ContextInitializer.getResource(ContextInitializer.java:141)
	at ch.qos.logback.classic.util.ContextInitializer.findURLOfDefaultConfigurationFile(ContextInitializer.java:135)
	at ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:148)
	at org.slf4j.impl.StaticLoggerBinder.init(StaticLoggerBinder.java:85)
	at org.slf4j.impl.StaticLoggerBinder.<clinit>(StaticLoggerBinder.java:55)
	at org.slf4j.LoggerFactory.bind(LoggerFactory.java:150)
	at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:124)
	at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:417)
	at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:362)
	at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:388)

[ceki]

You seem to be using logback 1.2, so import is not supported.

<configuration debug="true">

  <define name="savefolder" class="com.pesegato.monkeylog.MonkeyLog">
  </define>
  <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>${savefolder}/log/mylog.log</file>
  ...
</configuration>

[Pesegato]

Thanks, updated but I still get the same error.

[ceki]

Looks like a version problem. Which versions of logback-classic and logback-core are you using?

[Pesegato]

On MonkeyLog is

implementation 'org.slf4j:slf4j-api:1.7.21'
implementation 'ch.qos.logback:logback-core:1.2.3'

On the application that actually does the log, it is

annotationProcessor 'ch.qos.logback:logback-core:1.2.3'

[ceki]

Which versions logback-classic ? It is likely that the exception stems from a mismatch between logback-classic and logback-core.

[Pesegato]

logback-classic is not included in the gradle... what should it be?
EDIT: wait, somehow it is pulling logback-classic-1.1.2
I guess that's the problem
Found it: some libraries included this

runtimeOnly 'ch.qos.logback:logback-classic:1.1.2'