Hi
I am trying to execute a simple java code for a build using
Ant API rather than writing build.xml.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-compiler.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
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