Any number of properties can be used in ANT build.xml. They can be environment variables or variables set in a properties file.
There is an ability to check if required properties are set or not i.e. included or not in the properties file. Also we can match them to a regular expression to see of they are empty or matching as per the requirement. If they do not match the requirement, the build can be made to fail. There is a fail task provided by the ant library to fail the build. Add this as first task before adding any cutom tasks.
<property file="build.properties"/>
<property environment="env"/>
There is an ability to check if required properties are set or not i.e. included or not in the properties file. Also we can match them to a regular expression to see of they are empty or matching as per the requirement. If they do not match the requirement, the build can be made to fail. There is a fail task provided by the ant library to fail the build. Add this as first task before adding any cutom tasks.
Including Properties File
You can include a properties file or environmental variables in build.xml in the below way<property file="build.properties"/>
<property environment="env"/>
