Kalde ant from java program

Jeg har selv fundet ud af det...
Jeg har brugt følgende til at kalde Ant med:

DefaultLogger log = new DefaultLogger();
log.setErrorPrintStream(System.err);
log.setOutputPrintStream(System.out);
log.setMessageOutputLevel(Project.MSG_INFO);

Project ant = new Project();
ant.addBuildListener(log);
ProjectHelper helper = new ProjectHelperImpl();
ant.init();
helper.parse(ant, new File("build.xml"));
ant.setProperty("projectLocation",location);
ant.setProperty("projectName",projectName);
ant.setProperty("desiredBuild",desiredBuild);
ant.setProperty("logfileName",logName+" build.log");
ant.executeTarget("compile");