如何在 ServletContextListener 中出现异常时中止 Tomcat 启动? [英] How to abort Tomcat startup upon exception in ServletContextListener?

问题描述

我有一个实现 ServletContextListener 的类，它在启动时加载一些资源.

I have a class implementing ServletContextListener that loads some resources upon startup.

这些资源对应用程序至关重要，当我的逻辑中发生一些不良事件时，我希望整个启动失败.

Those resources are critical to the application in a way that I would like to fail the whole startup when some bad event happens in my logic.

是否可以从 ServletContextListener.contextInitialized() 方法内部执行任何命令来停止和失败整个 Tomcat 启动?

Is there any command I can execute from inside the ServletContextListener.contextInitialized() method to stop and fail the whole Tomcat startup?

推荐答案

尝试指定:

-Dorg.apache.catalina.startup.EXIT_ON_INIT_FAILURE=true

在您的 java 运行时选项中，引用 官方文档:

in your java runtime options, quoting official documentation:

如果为true，如果在服务器初始化阶段发生异常，服务器将退出.

If true, the server will exit if an exception happens during the server initialization phase.

如果未指定，将使用默认值 false.

If not specified, the default value of false will be used.

更新:

如果你想通过代码来做到这一点，System.exit()会起作用吗?

If you want to do this by code, will System.exit() work?

public class FailFastListener implements ServletContextListener {
    
    private static final Logger log = LoggerFactory.getLogger(FailFastListener.class);
    
    @Override
    public void contextInitialized(ServletContextEvent servletContextEvent) {
        try {
            //initialization
        } catch(Exception e) {
            log.error("Sooo bad, shutting down", e);
            System.exit(1);
        }
    }

    @Override
    public void contextDestroyed(ServletContextEvent servletContextEvent) {
    }
}

您可以使用 decorator 模式来包装现有的听众而不会使他们杂乱无章.不知道 Tomcat 会如何反应你...

You can use decorator pattern to wrap existing listeners without cluttering them. Not sure how will Tomcat react thou...

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