Gradle Goodness: Get Property Value With findProperty

by Sarang Nagmote



Category - Developer
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Gradle 2.13 added a new method to get a property value: findProperty. This method will return a property value if the property exists or null if the property cannot be found. Gradle also has the property method to return a property value, but this method will throw an exception if the property is missing. With the new findProperty method and the Groovy elvis operator (?:) we can try to get a property value and if not found return a default value.

In the following example we have a task that tries to print the value of the properties sampleOld and sampleNew. We use the findProperty for sampleNew and the property method for sampleOld:

// File: build.gradletask resolveProperties ${project.hasProperty(sampleOld) ? project.property(sampleOld) : default value for sampleOld}" println "sampleNew -> ${project.findProperty(sampleNew) ?: default value for sampleNew}"}

First run the task and not set the project properties sampleOld and sampleNew:

$ gradle -q resolvePropertiessampleOld -> default value for sampleOldsampleNew -> default value for sampleNew$

Next we use the -P command line option to set a value for the properties:

$ gradle -q -PsampleOld="Value sampleOld" -PsampleNew="Value sampleNew" resolvePropertiessampleOld -> Value sampleOldsampleNew -> Value sampleNew$

Written with Gradle 2.13.