Alternative to 'ThreadContext' in log4j

I have been working on a project which uses log4j2, and in this project I use ThreadContext. Now I'm back to working with log4j (1), and it doesn't provide ThreadContext. Are there any good alternatives that I can ThreadContext with? Google searches hasn't given my any good ideas yet, so I hope someone here might have some input.

You can use MDC (Mapped Diagnostic Context) directly. See here for more details. Also see this example on how to use it.

Basically you will set your attribute using:

MDC.put("userName", "test");

And then in the logger you can log that information like:

#note the %X{userName} - this is how you fetch data from Mapped Diagnostic Context (MDC)
log4j.appender.consoleAppender.layout.ConversionPattern = %-4r [%t] %5p %c %x - %m - user: %X{userName}%n

Or if using xml config, you can configure a separate appender with a filter for that user, like:

<appender name="Test" class="org.apache.log4j.DailyRollingFileAppender">
        <param name="File" value="my.log" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern"
                   value="[%d{HH:mm:ss.SSS}] %-8p [%-5t] %C{2}:%-12M - %m%n user: %X{userName}" />
        </layout>
        <filter class="org.apache.log4j.varia.StringMatchFilter">
                  <param name="StringToMatch" value=" user: test " />
                  <param name="AcceptOnMatch" value="true" />
          </filter>
    <filter class="org.apache.log4j.varia.DenyAllFilter"/>
    </appender>

And then enable a logger only for that appender:

<logger name="com.example.Clazz" additivity="false">
    <level value="info" />
    <appender-ref ref="Test"/>
</logger>

This way you can see the logs related only to user test.