PatternLayout double quote escape character in log4j2

Question

I need a log in log4j2 as below:

14:28:00.404 app_name="splunk sample app" method_name=main desc="sample log"

<PatternLayout pattern="%d app_name=\"%X{app_name}\" method_name=%M(%L) %m %n"/>

Pattern is failing because of double quotes. What is the escape character for double quate so the value of the key value pair is within double quotes in the log.

ThreadContext.put("app_name", "splunk sample app");

Answer 1

In your pattern, simply replace the two \" with " (the XML entity for the " character):

<PatternLayout pattern="%d app_name=&quot;%X{app_name}&quot; method_name=%M(%L) %m %n"/>

It will then log what you want:

14:28:00.404 app_name="splunk sample app" method_name=main desc="sample log"