Java 何时调用 contextDestroyed？
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When is contextDestroyed called?
提问by OldCurmudgeon
Having implemented a ContextListenerI can now happily deal with contextDestroyedevents by closing down my connection pools and flushing my caches etc.
实现了一个ContextListener我现在可以contextDestroyed通过关闭我的连接池和刷新我的缓存等来愉快地处理事件。
I was surprised recently when contextDestroyedwas called at a time when my server was not being shut down - it seemed to be at some arbitrary time which I have not been able to track down.
最近，contextDestroyed当我的服务器没有关闭时被调用时，我感到很惊讶- 它似乎是在某个我无法追踪的任意时间。
Is there any defined event or set of circumstances that trigger contextDestroyed?
是否有任何定义的事件或一组情况触发contextDestroyed？
Should I ensure that everything I do when contextDestroyedis called is reversible? Do I need to make all my pools survive a destroyed/initializedcycle? Was I wrong to assume I would only get a contextDestroyedwhen Tomcat was being shut down or my warwas being replaced?
我应该确保我在contextDestroyed被调用时所做的一切都是可逆的吗？我是否需要让我的所有池都能存活一个destroyed/initialized周期？我错误地假设我只会contextDestroyed在 Tomcat 被关闭或被war替换时得到一个？
采纳答案by glend
Through a series of trial and error testing I have found that contextDestroyed()is called when;
通过一系列的反复试验，我发现contextDestroyed()调用when；
- The server is
.WARis being updated/removed. - The server is shutdown due to administrator intervention.
- The server is shutdown due to a coding error. Something that would terminate a non-server application termination.
.WAR正在更新/删除服务器。- 由于管理员干预，服务器关闭。
- 由于编码错误，服务器关闭。会终止非服务器应用程序终止的东西。
If you are experiencing issue #3, as you are suggesting, I think the best possible course of action is to safely (be sure not to create an infinite loop) call contextInitialized()to ensure pools are recreated properly.
如果您遇到问题 #3，正如您所建议的那样，我认为最好的做法是安全地（确保不要创建无限循环）调用contextInitialized()以确保正确重新创建池。
回答by MrTux
See: http://docs.oracle.com/javaee/6/api/javax/servlet/ServletContextListener.html
请参阅：http: //docs.oracle.com/javaee/6/api/javax/servlet/ServletContextListener.html
contextDestroyed(ServletContextEvent sce): Receives notification that the ServletContext is about to be shut down.
contextDestroyed(ServletContextEvent sce)：接收 ServletContext 即将关闭的通知。
I.e., it gets called when a web application gets unloaded (e.g., you remove or replace a .war file from the web-apps folder OR unload it using the Tomcat server-manager).
即，它在 Web 应用程序卸载时被调用（例如，您从 web-apps 文件夹中删除或替换 .war 文件或使用 Tomcat 服务器管理器卸载它）。
