How to customize date format pattern for access logging in JBoss EAP 8 / 7

Solution Verified - Updated

Environment

  • Red Hat JBoss Enterprise Application Platform (EAP)
    • 7.x

Issue

  • How do I customize date format pattern for access logging in JBoss EAP 7?
  • A default %t outputs date with a format like [01/Dec/2016:13:45:56 +0900]. I would like to change it like [2016-12-01 13:45:56.789] (with milliseconds but without timezone information). How can I configure this?
  • How do I increase time format precision in JBoss EAP access log?

Resolution

You can customize data format pattern by using %{time,xxx} with Content from docs.oracle.com is not included.SimpleDateFormat inside pattern attribute of <access-log> setting in undertow subsystem. (A default date format pattern is using [dd/MMM/yyyy:HH:mm:ss Z] internally.)

So, if you followed How to enable access logging for JBoss EAP 7? - Red Hat Customer Portal and just want to change date format like [2016-12-01 13:45:56.789], you can specifying [%{time,yyyy-MM-dd HH:mm:ss.SSS}] instead of %t. For example:

/subsystem=undertow/server=default-server/host=default-host/setting=access-log:add(pattern="%h %l %u [%{time,yyyy-MM-dd HH:mm:ss.SSS}] \"%r\" %s %b \"%{i,Referer}\" \"%{i,User-Agent}\" \"%{i,COOKIE}\" \"%{o,SET-COOKIE}\" %S \"%I\" %T")

Then, setting will change like the following:

<access-log pattern="%h %l %u [%{time,yyyy-MM-dd HH:mm:ss.SSS}] &quot;%r&quot; %s %b &quot;%{i,Referer}&quot; &quot;%{i,User-Agent}&quot; &quot;%{i,COOKIE}&quot; &quot;%{o,SET-COOKIE}&quot; %S &quot;%I&quot; %T"/>

By the way, note that the timestamp (%t) being logged by JBoss EAP 6.x (JBossWeb), JBoss EAP 7.x (Undertow) and Tomcat is not the time when a request was received but actually the time when the access logging was written at the completion of a request/response. See also this knowledge article "Discrepancy between Apache httpd log time and JBoss log time".

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