How do I use ant xmlns in gradle?

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apply plugin: 'java'
  repositories {
    flatDir {
        dirs 'C:\Program Files\Oracle\JavaFX 2.0 SDK\tools', 'C:\Program Files\Oracle\JavaFX 2.0 SDK\rt\lib'
    }
}
  configurations {
    antJavafx
}
  dependencies {
    compile ':jfxrt'
    antJavafx ':ant-javafx'
}
  task javaFxPackage << {
    ant.taskdef( resource:"com/sun/javafx/tools/ant/antlib.xml", classpath: configurations.antJavafx.asPath, uri: 'javafx.com.sun.javafx.tools.ant')
          ant.'javafx.com.sun.javafx.tools.ant:jar' (destfile: 'myApp.jar') {
        fileset(dir: 'build/classes/main')
    }
}

Then you can do:

gradle jar

gradle javaFxPackage