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    <p>An alternative to the answers you've already received is to create a custom task container that makes sure it does not repeat an action. I have such a custom task in <a href="http://wiki.github.com/dwdyer/uncommons-antlib/" rel="nofollow noreferrer">my personal Antlib</a>, but there's a whole load of other junk in there that you probably don't want, so maybe you could just copy <a href="http://github.com/dwdyer/uncommons-antlib/blob/master/src/java/main/org/uncommons/antlib/tasks/Once.java" rel="nofollow noreferrer">the source</a> and add it to your own project. It looks something like this:</p> <pre><code>import org.apache.tools.ant.Task; import org.apache.tools.ant.TaskContainer; import org.apache.tools.ant.BuildException; import java.util.List; import java.util.LinkedList; /** * Task container to ensure that some set of actions is only performed * once per build. On completion of the actions a property is set that * prevents subsequent executions. */ public class Once extends Task implements TaskContainer { private final List&lt;Task&gt; tasks = new LinkedList&lt;Task&gt;(); private String property; /** * The name of the property to consult in order to determine whether * the nested tasks should be performed. This is a required attribute. */ public void setProperty(String property) { this.property = property; } public void addTask(Task task) { tasks.add(task); } @Override public void execute() throws BuildException { if (property == null || property.length() == 0) { throw new BuildException("Property name must be specified."); } // If no value is specified, the tasks are performed if the property // is set to any value. If a value is specified, the tasks are only // performed if the property matches that value. if (getProject().getProperty(property) == null) { for (Task task : tasks) { task.perform(); } getProject().setProperty(property, "done"); } } } </code></pre>
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    1. POIs there a way to guarantee that an ant dependency is run only once?
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    1. USDan Dyer
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    1. COThanks, Dan. I wasn't aware that a custom TaskContainer was a possibility. It's clear that I have more reading to do.
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    2. COGreat work Dan! Cant wait to try out uncommons with Ivy, Hudson and especially using the maven-ant tasks - makes build, deploy, test much easier. Thanks.
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