How to over-write the property in Ant?

ant properties task
Priya picture Priya · Dec 8, 2009 · Viewed 63.2k times · Source

Is there a way to re-assign the value for the Ant property task? Or is there another task available for that purpose?

Answer

skaffman picture skaffman · Dec 8, 2009

ant-contrib's Variable task can do this:

<property name="x" value="6"/>
<echo>${x}</echo>   <!-- will print 6 -->
<var name="x" unset="true"/>
<property name="x" value="12"/>
<echo>${x}</echo>   <!-- will print 12 -->

Not recommended, though, it can lead to weird side-effects if parts of your Ant scripts assume immutable property values, and other parts break this assumption.

Related questions

How to include external libraries in Ant build.xml file?

In my Java source-code I want to use different classes from java archives (.jar) stored in my application's "lib" directory. But if I do "ant run" then I always get a "java.lang.NoClassDefFoundError" message. I tried several things to …

Read More
ANT: How to read property setted in a foreach loop

Dear, I currently face some problem to retrieve the value of a property setted in a foreach loop. Maybe one of you could help me... The purpose is to check if one file of a folder has been modified since …

Read More
Why use Gradle instead of Ant or Maven?

What does another build tool targeted at Java really get me? If you use Gradle over another tool, why?

Read More