How can I use log4j with multiple use of appenders with dynamic filename?

Question

I want to use an log4j-Appender multiple times, but with different filenames:

Appender:

<RollingFile name="MODULE" fileName="log/module-${ModuleName}.log" append="true" filePattern="log/module-${ModuleName}-%d{yyyy-MM-dd}_%i.log" >
    <PatternLayout pattern="%d{yyyy/MM/dd-HH:mm:ss} %-5p %C:%M:%L ~ %m%n"/>
    <Policies>
        <OnStartupTriggeringPolicy />
        <TimeBasedTriggeringPolicy interval="1" modulate="true"/>
        <SizeBasedTriggeringPolicy size="100MB"/>
    </Policies>
    <DefaultRolloverStrategy max="10"/>
</RollingFile>

Loggers:

<Logger name="MOD1" level="debug">
    <Properties>
        <Property name="ModuleName">MOD1</Property>
    </Properties>
    <appender-ref ref="MODULE"/>
</Logger>
<Logger name="MOD2" level="error">
    <Properties>
        <Property name="ModuleName">MOD2</Property>
    </Properties>
    <appender-ref ref="MODULE"/>
</Logger>

But this don't work. How can I pass a Variable from the Logger to the Appender? Finally I want 2 Files

/log/module-MOD1.log <- Debug messages from MOD1
/log/module-MOD2.log <- Error messages from MOD2

Thanks for any help

Answer 1

Just add another Appender and connect Logger and Appender each pair.

For example:

...
<RollingFile name="MODULE1" fileName="./log/module1-${ModuleName}.log" append="true" filePattern="./log/module1-${ModuleName}-%d{yyyy-MM-dd}_%i.log" >
    <PatternLayout pattern="%d{yyyy/MM/dd-HH:mm:ss} %-5p %C:%M:%L ~ %m%n"/>
    <Policies>
        <OnStartupTriggeringPolicy />
        <TimeBasedTriggeringPolicy interval="1" modulate="true"/>
        <SizeBasedTriggeringPolicy size="100MB"/>
    </Policies>
    <DefaultRolloverStrategy max="10"/>
</RollingFile>

<RollingFile name="MODULE2" fileName="./log/module2-${ModuleName}.log" append="true" filePattern="./log/module2-${ModuleName}-%d{yyyy-MM-dd}_%i.log" >
    <PatternLayout pattern="%d{yyyy/MM/dd-HH:mm:ss} %-5p %C:%M:%L ~ %m%n"/>
    <Policies>
        <OnStartupTriggeringPolicy />
        <TimeBasedTriggeringPolicy interval="1" modulate="true"/>
        <SizeBasedTriggeringPolicy size="100MB"/>
    </Policies>
    <DefaultRolloverStrategy max="10"/>
</RollingFile>
...

...
<Logger name="com.foo.bar.ClassName1" level="debug">
    <Properties>
        <Property name="ModuleName">MOD1</Property>
    </Properties>
    <appender-ref ref="MODULE1"/>
</Logger>
<Logger name="com.foo.bar.ClassName2" level="error">
    <Properties>
        <Property name="ModuleName">MOD2</Property>
    </Properties>
    <appender-ref ref="MODULE2"/>
</Logger>
...

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