如何自定义或删除 Log4j2 中的默认属性 - JSON 布局

Question

In Spring Boot 2 application I have configured Log4j2 with JsonLayout like below

    ....

    <Appenders>
        <Console name="ConsoleJSONAppender" target="SYSTEM_OUT">
            <JsonLayout complete="false" compact="false">
            </JsonLayout>
        </Console>
    </Appenders> 
    <Logger name="CONSOLE_JSON_APPENDER" level="INFO" additivity="false">
        <AppenderRef ref="ConsoleJSONAppender" />
    </Logger>

    .....

and I got output like below

    {
            "timeMillis" : 1496306649058,
            "thread" : "main",
            "level" : "INFO",
            "loggerName" : "ConsoleJSONAppender",
            "message" : "Json Message",
            "endOfBatch" : false,
            "loggerFqcn" : "org.apache.logging.log4j.spi.AbstractLogger",
            "threadId" : 1,
            "threadPriority" : 5
    }

Output is fine but I don't want attributes like "endofBatch", "threadPriority" and others but it is getting displayed in logs, how to avoid unwanted (default) attributes in JsonLayout based logs .

Answer 1

If you want to log only level and loggerName than customize like below in your configuration file.

...
<PatternLayout>
    <pattern>{"level":"%p","loggerName":"%c"}</pattern>
</PatternLayout>
...

The parameter are described at here . Find Patterns at Pattern Layout .