Shortly after writing to this list, I hit on one solution. 

If the Custom Appender is configured as described below :

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 

<configuration>
    <appender name="theCustomAppender" class="domain.TheCustomAppender">
        <properties>
            propertyName1=propertyValue1
            propertyName2=propertyValue2
        </properties>
    </appender>
</configuration>
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 


Add a "Properties" getter and setter which uses a String argument.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 

public String getProperties()

public setProperties(String propertiesString)

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 


When I need the Properties object, I simple do the following:

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
Properties properties = new Properties();
properties.load(new StringReader(propertiesString));
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 


Problem solved. 


Feel free to reply to this thread, with an alternate solution that makes use of a more Joran-oriented technique.


Thanks,

John Page
From: John Page
Sent: 28 July 2016 13:12:38
To: logback-user@qos.ch
Subject: Custom Appender Configuration using generic Properties
 

Hi,


I have developed a custom appender for logback and would like to configure it with a generic set of Properties that I can pass on to the underlying libraries. Rather than create a Getter and Setter for each property that the underlying library uses, I would like the configuration to read the *names* of the properties out of the logback configuration file.


Instead of this:

<configuration>

    <appender name="theCustomAppender" class="domian.TheCustomAppender">

        <getterSetterProperty>value</getterSetterProperty>

    </appender>

</configuration>


I would like to write something like this:

<configuration>

    <appender name="theCustomAppender" class="domian.TheCustomAppender">

        <properties class="java.util.Properties">

            <property name="thisPropertyName" value="value" />

        </properties>

    </appender>

</configuration>


Does the Joran Configurator have the capability to parse a configuration file, generate a Properties object, and then hand it off to the Appender?
I have looked around and have not been able to identify any guidance for this use case. I have discovered the nested element capability and the "class" attribute, but have not been able to build a mapped structure. 

The north-west wind does feel a bit chilly, right now... :-)


Thanks,
John Page