[英]Spring: SmartLifecycle: Lifecycle.stop() not called with <mvc:annotation-driven /> but it is with @EnableWebMvc
當我使用 java 配置但不使用 XML 配置進行配置時,我無法弄清楚為什么在 Tomcat 中運行的簡單 Spring 5.1.12 webapp 調用 Lifecycle.stop() 方法。 我有實現 SmartLifecycle 的有問題的 bean LifecycleLoggingBean,並且我已經覆蓋了所有方法(請參閱問題結尾)。
更新:如果我在 mvc-servlet.xml 中實例化我的 LifecycleLoggingBean,則會調用停止。 我想默認情況下沒有什么能阻止主應用程序上下文。 是否有一種“正確”的方式來觸發關閉主應用程序上下文? 事實證明,它也是從主應用程序上下文中調用的,只是沒有記錄。
如果我這樣配置應用程序,則會調用 Lifecycle.stop():
@EnableWebMvc
@Configuration
@ComponentScan({"some.package"})
public class SpringConfig implements WebMvcConfigurer {
@Bean
public InternalResourceViewResolver viewResolver() {
InternalResourceViewResolver viewResolver
= new InternalResourceViewResolver();
viewResolver.setViewClass(JstlView.class);
viewResolver.setPrefix("/WEB-INF/views/");
viewResolver.setSuffix(".jsp");
return viewResolver;
}
}
如果我刪除 class 並將以下內容放入 web.xml:
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>mvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>mvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
以及 applicationContext.xml 中的以下內容:
<context:component-scan base-package="some.package" />
<mvc:annotation-driven />
<bean class = "org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name = "prefix" value = "/WEB-INF/jsp/"/>
<property name = "suffix" value = ".jsp"/>
</bean>
並添加一個 mvc-servlet.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
">
</beans>
然后 Lifecycle.stop() 不會被調用。
在所有情況下,Lifecycle.start() 都會被調用。
這是帶有 Java 配置的日志:
[org.springframework.web.servlet.DispatcherServlet]:525 - - Initializing Servlet 'dispatcher'
[some.packge.testapp.LifecycleLoggingBean]:15 - - ********** SmartLifecycle isAutoStartup
[some.packge.testapp.LifecycleLoggingBean]:21 - - ********** SmartLifecycle getPhase
[some.packge.testapp.LifecycleLoggingBean]:43 - - ********** Lifecycle isRunning false
[some.packge.testapp.LifecycleLoggingBean]:15 - - ********** SmartLifecycle isAutoStartup
[some.packge.testapp.LifecycleLoggingBean]:27 - - ********** Lifecycle start
[org.springframework.web.servlet.DispatcherServlet]:547 - - Completed initialization in 953 ms
[some.packge.testapp.LifecycleLoggingBean]:21 - - ********** SmartLifecycle getPhase
[some.packge.testapp.LifecycleLoggingBean]:43 - - ********** Lifecycle isRunning true
[some.packge.testapp.LifecycleLoggingBean]:32 - - ********** SmartLifecycle stop
[some.packge.testapp.LifecycleLoggingBean]:39 - - ********** Lifecycle stop
這是帶有 xml 配置的日志:
[org.springframework.web.context.ContextLoader]:271 - - Root WebApplicationContext: initialization started
[some.package.testapp.LifecycleLoggingBean]:15 - - ********** SmartLifecycle isAutoStartup
[some.package.testapp.LifecycleLoggingBean]:21 - - ********** SmartLifecycle getPhase
[some.package.testapp.LifecycleLoggingBean]:43 - - ********** Lifecycle isRunning false
[some.package.testapp.LifecycleLoggingBean]:15 - - ********** SmartLifecycle isAutoStartup
[some.package.testapp.LifecycleLoggingBean]:27 - - ********** Lifecycle start
[org.springframework.web.context.ContextLoader]:307 - - Root WebApplicationContext initialized in 1203 ms
[org.springframework.web.servlet.DispatcherServlet]:525 - - Initializing Servlet 'dispatcher'
[org.springframework.web.servlet.DispatcherServlet]:547 - - Completed initialization in 31 ms
[org.springframework.web.servlet.DispatcherServlet]:525 - - Initializing Servlet 'mvc'
[org.springframework.web.servlet.DispatcherServlet]:547 - - Completed initialization in 31 ms
這是 LifecycleLoggingBean:
@Component
public class LifecycleLoggingBean implements SmartLifecycle {
private final Logger logger = LoggerFactory.getLogger(LifecycleLoggingBean.class);
@Override
public boolean isAutoStartup() {
logger.info("********** SmartLifecycle isAutoStartup");
return true;
}
@Override
public int getPhase() {
// start last and stop first
logger.info("********** SmartLifecycle getPhase");
return Integer.MAX_VALUE;
}
private AtomicBoolean isRunning = new AtomicBoolean(false);
@Override
public void start() {
logger.info("********** Lifecycle start");
isRunning.set(true);
}
@Override
public void stop(Runnable callback) {
logger.info("********** SmartLifecycle stop");
stop();
callback.run();
}
@Override
public void stop() {
isRunning.set(false);
logger.info("********** Lifecycle stop");
}
public boolean isRunning() {
boolean rval = isRunning.get();
logger.info("********** Lifecycle isRunning {}", rval);
return rval;
}
}
事實證明,stop() 方法也是從主應用程序上下文調用的,只是沒有記錄。 Log4j2 自動將自身注冊為 web 片段,這意味着它在調用 ContextLoaderListener 的 contextDestroyed 方法之前關閉。 當最終調用 contextDestroyed 時,日志消息將丟失。 但是,通過登錄到 System.out,我能夠在 tomcat 日志中看到消息。
通過禁用 log4j 的正常自動注冊並以舊的(servlet 2.5 及之前)方式注冊它,我能夠顯示日志消息。
<context-param>
<param-name>isLog4jAutoInitializationDisabled</param-name>
<param-value>true</param-value>
</context-param>
<listener>
<listener-class>org.apache.logging.log4j.web.Log4jServletContextListener</listener-class>
</listener>
<filter>
<filter-name>log4jServletFilter</filter-name>
<filter-class>org.apache.logging.log4j.web.Log4jServletFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>log4jServletFilter</filter-name>
<url-pattern>/*</url-pattern>
<dispatcher>REQUEST</dispatcher>
<dispatcher>FORWARD</dispatcher>
<dispatcher>INCLUDE</dispatcher>
<dispatcher>ERROR</dispatcher>
<!-- Servlet 3.0 w/ disabled auto-initialization only; not supported in 2.5 -->
<dispatcher>ASYNC</dispatcher>
</filter-mapping>
這最終成為一個次優的解決方案,因為我們的日志記錄基礎設施依賴於使用Web Lookup ${web:servletContextName},它似乎沒有在默認注冊之外進行初始化。 所以我們將使用@EventListener 而不是SmartLifecycle。
@EventListener(classes = {
ContextStoppedEvent.class,
ContextClosedEvent.class
})
public void stop() {
// still get to clean up.
}
log4j 問題跟蹤器中有一個未解決的問題,正是描述了這個問題: https://issues.apache.org/jira/browse/LOG4J2-2624
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