I would recommend that you forget about the Taskdef and just focus on instantiating and executing the IzPackTask task instance.
For example: IzPackTask task = new IzPackTask(); task.setProject( project ); // you customatization of the task task.init(); task.execute(); /Steve. > -----Original Message----- > From: subir bhaumik [mailto:[EMAIL PROTECTED] > Sent: Saturday, 20 May 2006 3:01 PM > To: dev@ant.apache.org > Subject: Using Ant Programmatically > > > Hello, > > I am posting to this group since I am not getting any > guidance apart from > "look at ant source code". > > I am trying to use ant programmatically using the Ant API. > > When executing the code > it throws NullPointerException for the line > > tinstaller.setClasspath(class_path); > > in the code. > It is for the class "org.apache.tools.ant.taskdefs.Taskdef;" > But for the other taskdefs e.g. Javac its O.K. > Is there any problem to load classpath in Taskdef object? > If not then where's the wrong with the code? > The Exception > > Exception in thread "main" java.lang.NullPointerException > at > org.apache.tools.ant.taskdefs.DefBase.setClasspath(DefBase.java:90) > at Installer.main(Installer.java:35) > > Code > > > > import org.apache.tools.ant.BuildException; > import org.apache.tools.ant.launch.Locator; > import org.apache.tools.ant.taskdefs.Taskdef; > import org.apache.tools.ant.Project; > import org.apache.tools.ant.types.Path; > import com.izforge.izpack.ant.*; > > public class Installer { > > public static void main(String args[]) { > > Project p = new Project(); > p.init(); > p.setName("Building"); > p.setDefault("installer") ; > p.setBasedir("."); > > > org.apache.tools.ant.types.Path class_path = new > org.apache.tools.ant.types.Path(p); > > > class_path.setPath("C:/Bishwakarma/BuildTemp/lib/standalone-co mpiler.jar"); > org.apache.tools.ant.taskdefs.Taskdef > tinstaller = new > org.apache.tools.ant.taskdefs.Taskdef(); > tinstaller.setProject(p); > tinstaller.setTaskName("izpack"); > > tinstaller.setClasspath(class_path); > > > tinstaller.setClassname("com.izforge.izpack.ant.IzPackTask"); > tinstaller.execute(); > > } > > > } > > Any suggestion will be highly appreciated. > > Warm Regards > Subir > > > --------------------------------- > Do you have a question on a topic you cant find an Answer > to. Try Yahoo! Answers India Get the all new Yahoo! > Messenger Beta Now --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
