code: @Override
    protected ILaunchConfigurationWorkingCopy createLaunchConfiguration(IJavaElement element)
        throws CoreException {
      ILaunchConfigurationWorkingCopy wc =  super.createLaunchConfiguration(element);
  
      String containerUrl = JicUnitPlugin.getDefault().getPreferenceStore()
          .getString(CONTAINER_URL);    
      String extraVwArg = "-D" + CONTAINER_URL + "=" + containerUrl;
      wc.setAttribute(IJavaLaunchConfigurationConstants.ATTR_VM_ARGUMENTS, extraVwArg);
      
      return wc;
    }
docs: /* (non-Javadoc)
  @see org.eclipse.jdt.junit.launcher.JUnitLaunchShortcut#createLaunchConfiguration(org.eclipse.jdt.core.IJavaElement)