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package my;
import com.izforge.izpack.installer.InstallData;
import com.izforge.izpack.panels.treepacks.PackValidator;
import com.izforge.izpack.api.handler.AbstractUIHandler;
public class Validatorclass implements PackValidator {
  public boolean validate(AbstractUIHandler handler,
      InstallData idata, String packsId, boolean isSelected) {
    [ your validation code here ]
    return false; // returns to the pack selection without further notice
    return true; // passes on to the next defined validator for this pack
  }
}