The document discusses how properties files in Mule can be used to store configuration settings and localization data. Properties can come from various sources like system properties, environment variables, and property files, with property files taking the highest priority. An example properties file is provided containing key-value pairs, and the order of priority for different property sources when multiple are defined is explained.

1. Karthik

2.  A properties file is a simple collection of key-value pairs that
can be parsed by the java.util.Properties class. They are often
used to store configuration or localization data. In mule
properties file can be configured using property placeholders
and system properties.
 Example of a property file is as below:

3. System Properties:
The placeholder value can come from a JDK system property. If
you start Mule from the command line, you would specify the
properties as follows:

5. Environment Variables:
There is no standard way in Java to access environment variables.
But the setting of environment variables can be done in the run
configurations window…choose Environment tab.

6. Mule-app.properties:
The property can be configured in mule-project.xml as below:
Add an environment variable by pressing the button:

8. Example:
 The example above tries to display the property name which is
a common property from various sources the observation is as
below:

9. Observation:
 The property in the mule-app.properties is prioritized the
most, Global variables is prioritized the next most and next is
the run time arguments followed by Environment Variables and
then follows the property files in alphabetical order.

10. Thank You All