$${mdc:request_id} in a pattern should cause the request_id to be evaluated on
every event.
Ralph
> On Sep 30, 2013, at 8:04 AM, Oliver Flege <[email protected]> wrote:
>
> ok, this works for ${...} expressions in the configuration, but I don't see
> how it would
> apply to pattern evaluation. To simplify and rephrase my original question:
>
> Given a pattern layout with a pattern like: %X{REQUEST_ID}
>
> is it possible to define a default value that will be printed
> if the thread never executed ThreadContext.put("REQUEST_ID", "XYZ")?
>
> I tried ${mdc:REQUEST_ID} + a Property REQUEST_ID, but that
> will only be evaluated when the configuration is parsed.
>
> Oliver
>
>> Yes, it supports default values. Specify them as properties at the beginning
>> of your configuration. Then when you specify something like ${sys:foo} if
>> foo is not defined as a system property the default value will be used,
>>
>> Ralph
>>
>>> On Sep 30, 2013, at 3:30 AM, Oliver Flege <[email protected]> wrote:
>>>
>>> Hi,
>>>
>>> I am considering to switch from slf4j/logback to log4j2;
>>>
>>> in slf4j/logback, I can specify a default value for a missing mdc entry
>>> like this:
>>>
>>> <pattern>%d{HH:mm:ss} %X{FOO:--} %c{0} - %m%n</pattern>
>>>
>>> which would print "-" if mdc.get("FOO") is null (the ":-" separates
>>> the key and the default value).
>>>
>>> Having a defined number of tokens/fields at the beginning of the log message
>>> makes it easier to process it with awk/cut etc.
>>>
>>>
>>> Does log4j support default values? - I could not find any hint in the
>>> documentation
>>>
>>>
>>>
>>> Regards,
>>> Oliver
>>>
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>
> --
> Oliver Flege
> Senior Software Engineer | vwd group
>
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