自定义初始化组件代码如下:
@Component public class InitComponent implements ServletContextListener, ApplicationContextAware { private static ApplicationContext applicationContext; @Override public void contextInitialized(ServletContextEvent servletContextEvent) { ServletContext sc = servletContextEvent.getServletContext(); //设置博主信息 BloggerService bloggerService = (BloggerService) applicationContext.getBean("bloggerService"); //错误处 Blogger blogger = bloggerService.getBlogger(); blogger.setPassword(null); sc.setAttribute("blogger", blogger); } @Override public void contextDestroyed(ServletContextEvent servletContextEvent) { } @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { this.applicationContext = applicationContext; } }
写这段代码并且将其配在web.xml的listener中,用意在于项目启动的时候通过监听就初始化一些信息,
但是每次启动错误处就会报NullPoint异常,经过排查才知道:
Spring在项目启动时扫描注解配置的Bean是有顺序的,具体顺序是ApplicationContext.xml的顺序,
问题就出在这,当扫描到这个类时如果BloggerService还没有被扫描到,就自然会报错了。
原文地址:https://www.cnblogs.com/goxcheer/p/9387492.html
时间: 2024-11-09 00:20:23