Cannot initialize context because there is already a root application context present

一、問題

Cannot initialize context because there is already a root application context present - check whether you have multiple ContextLoader* definitions in your web.xml!

二、問題描述

在自定義spring-boot的啓動監聽器時報錯，意思是說有多個內容加載監聽器，導致項目無法啓動。

三、問題解決

原錯誤代碼：

/**
 * 項目啓動監聽器
 */
@Component
public class StartListener extends ContextLoaderListener implements ApplicationRunner {

    @Override
    public void contextInitialized(ServletContextEvent event) {
        super.contextInitialized(event);
    }

    @Override
    public void run(ApplicationArguments args) {

    }
}

原因就是在重載contextInitialized()方法時，調用了父類的初始化方法；去掉 super.contextInitialized(event);即可。