import org.apache.tools.ant.ProjectHelper
import org.apache.tools.ant.Project
import org.apache.tools.ant.BuildException

public void invoke(){
 File antFile = new File("build.xml")

 Project project = new Project()
 project.init()
 ProjectHelper.projectHelper.parse(project, antFile)

 try{
   project.executeTarget('echo-1')
 } catch (BuildException e) {
     println e.location
 }
}

An example on how to invoke Ant targets which are defined in build.xml.

Running an Ant target programmaticly

java, groovy

Groovy