For some reason both the suggested approaches do not work - To try out the approaches in a standalone environment I am using a system property instead of a JNDI one. I add the following the logback.xml to try the first suggested approach <property name="LOG_LOCATION" value="${loglocation}"/> <if condition='property("LOG_LOCATION").equals("")'> <then> <property name="LOG_LOCATION" value="E://Temp//Logs"/> </then> </if> The outcome is that a directory named loglocation_IS_UNDEFINED is created under the current working directory. First approach is preferred then the second one (<file>${LOG_LOCATION:-some default}/blah.log</file>) since declaring the log location property at the start is helpful and can be used by all the file appenders declared in the log file. Is using a system property instead of a JNDI causing the problem ? Ceki Gulcu wrote:

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

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