[logback-user] Is it possible to set a defined property with a new value?

[Ceki Gulcu]

On 21.04.2011 14:45, LogbackUser wrote:
>
> Below is something what I want to achieve
>
>      <insertFromJNDI env-entry-name="LogLocation" as="LOG_LOCATION"/>
>
>      <if condition='property("LOG_LOCATION").equals("")'>
>          <then>
>              <!--how do I reset the LOG_LOCATION property here-->
>          </then>
>      </if>
>
> Basically I want to set the LOG_LOCATION property to be set to a default
> value if the JNDI entry is not present. What currently happens is - if the
> JNDI property is not defined it assigns the property named "LOG_LOCATION" to
> "LOG_LOCATION_IS_UNDEFINED".
>
> Thank you in advance.

Hello,

You have several options available to you.

You can either set the default value for LOG_LOCATION if it is 
undefined. Here is how:

  <insertFromJNDI env-entry-name="LogLocation" as="LOG_LOCATION"/>

  <if condition='property("LOG_LOCATION").equals("")'>
    <then>
      <property name="LOG_LOCATION" value="some default" />
    </then>
  </if>

You can also make use of the Default substitution feature [1]:

<insertFromJNDI env-entry-name="LogLocation" as="LOG_LOCATION"/>

<appender class="ch.qos.logback.core.FileAppender>
   <file>${LOG_LOCATION:-some default}/blah.log</file>
   ....
</appender>

HTH,

[1] 
http://logback.qos.ch/manual/configuration.html#defaultValuesForVariables

-- 
Ceki