How to use

clearFlash

method

in

org.springframework.webflow.engine.ViewState

private void refresh(View view, RequestControlContext context) {
  ExternalContext externalContext = context.getExternalContext();
  if (externalContext.isResponseComplete()) {
    clearFlash(context);
  } else {
    render(context, view);
  }
}

private void render(RequestControlContext context, View view) throws ViewRenderingException {
  if (logger.isDebugEnabled()) {
    logger.debug("Rendering + " + view);
    logger.debug("  Flash scope = " + context.getFlashScope());
    logger.debug("  Messages = " + context.getMessageContext());
  }
  context.viewRendering(view);
  renderActionList.execute(context);
  try {
    view.render();
  } catch (IOException e) {
    throw new ViewRenderingException(getOwner().getId(), getId(), view, e);
  }
  clearFlash(context);
  context.getExternalContext().recordResponseComplete();
  context.viewRendered(view);
}

protected void doEnter(RequestControlContext context) throws FlowExecutionException {
  context.assignFlowExecutionKey();
  ExternalContext externalContext = context.getExternalContext();
  if (externalContext.isResponseComplete()) {
    if (!externalContext.isResponseCompleteFlowExecutionRedirect()) {
      clearFlash(context);
    }
  } else {
    if (shouldRedirect(context)) {
      context.getExternalContext().requestFlowExecutionRedirect();
      if (popup) {
        context.getExternalContext().requestRedirectInPopup();
      }
    } else {
      View view = viewFactory.getView(context);
      context.setCurrentView(view);
      render(context, view);
    }
  }
}

  context.getFlashScope().put(View.USER_EVENT_STATE_ATTRIBUTE, view.getUserEventState());
} else {
  clearFlash(context);

private void refresh(View view, RequestControlContext context) {
  ExternalContext externalContext = context.getExternalContext();
  if (externalContext.isResponseComplete()) {
    clearFlash(context);
  } else {
    render(context, view);
  }
}

private void render(RequestControlContext context, View view) throws ViewRenderingException {
  if (logger.isDebugEnabled()) {
    logger.debug("Rendering + " + view);
    logger.debug("  Flash scope = " + context.getFlashScope());
    logger.debug("  Messages = " + context.getMessageContext());
  }
  context.viewRendering(view);
  renderActionList.execute(context);
  try {
    view.render();
  } catch (IOException e) {
    throw new ViewRenderingException(getOwner().getId(), getId(), view, e);
  }
  clearFlash(context);
  context.getExternalContext().recordResponseComplete();
  context.viewRendered(view);
}

protected void doEnter(RequestControlContext context) throws FlowExecutionException {
  context.assignFlowExecutionKey();
  ExternalContext externalContext = context.getExternalContext();
  if (externalContext.isResponseComplete()) {
    if (!externalContext.isResponseCompleteFlowExecutionRedirect()) {
      clearFlash(context);
    }
  } else {
    if (shouldRedirect(context)) {
      context.getExternalContext().requestFlowExecutionRedirect();
      if (popup) {
        context.getExternalContext().requestRedirectInPopup();
      }
    } else {
      View view = viewFactory.getView(context);
      context.setCurrentView(view);
      render(context, view);
    }
  }
}

  context.getFlashScope().put(View.USER_EVENT_STATE_ATTRIBUTE, view.getUserEventState());
} else {
  clearFlash(context);