JSP自定义标签调用spring注入的bean

JSP自定义标签中如何才能调用spring注入的JavaBean?

按照http://topic.csdn.net/u/20080716/11/92f124e3-b51d-4610-9cfe-744317726604.html的方法做了
但是要报异常java.lang.IllegalStateException: No WebApplicationContext found: no ContextLoaderListener registered?

求达人解惑

代码:
public class CreateTree extends org.springframework.web.servlet.tags.RequestContextAwareTag {
        /**
* 树菜单数据访问对象
*/
private PopedomBiz popedomBiz;
        public void setPopedomBiz(PopedomBiz popedomBiz) {
this.popedomBiz = popedomBiz;
}
/**
* 输出流
*/
private JspWriter out;

@Override
protected int doStartTagInternal() throws Exception {
popedomBiz = (PopedomBiz)this.getRequestContext().getWebApplicationContext().getBean("PopedomBiz");
out = pageContext.getOut();
pageContext.getResponse().setCharacterEncoding("utf-8");
try {
out.print(getJSFunction());//写入数据
out.print(getTreeData());//写入JS文件
out.flush();//压出数据
} catch (IOException e) {
throw new JspException(e.getMessage());
}
return SKIP_BODY;
}
}

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这种方式也不行：
ApplicationContext ac = WebApplicationContextUtils.getRequiredWebApplicationContext(pageContext.getServletCon