logback的shutdownHook是否取消注册jmxConfigurator

Question

我正在使用<jmxConfigurator/>logback 中的元素; jmxConfigurator声明如下:

Thus, unless your application is a standalone Java application, you **MUST** unregister the JMXConfigurator instance from the JVM's Mbeans server.

logback文档还提到了一个<shutdownHook/>配置元素,根据文档执行以下操作:

Installing a JVM shutdown hook is a convenient way for shutting down logback and releasing associated resources.

是否包含<shutdownHook/>元素注意取消注册<jmxConfigurator/>？

Answer 1

是的,它确实.以下是调试器的证明:

但是,有一些限制:

1. <shutdownHook/> 仅在1.1.3版本中可用
2. 虽然文档说 plain <shutdownHook/>是足够的,但你必须指定class属性: <shutdownHook class="ch.qos.logback.core.hook.DelayingShutdownHook"/> 否则logback抱怨:

   ERROR in ch.qos.logback.core.joran.action.ShutdownHookAction - Missing class name for shutdown hook. Near [shutdownHook] line 16
   

要确保JMXConfigurator停止,请在logback配置上启用调试模式:

<configuration debug="true">
   ...
</configuration>

然后在日志结束时,您将看到:

INFO in ch.qos.logback.core.hook.DelayingShutdownHook@1a246fc6 - Logback context being closed via shutdown hook
INFO in ch.qos.logback.classic.jmx.JMXConfigurator(default) - onReset() method called JMXActivator [ch.qos.logback.classic:Name=default,Type=ch.qos.logback.classic.jmx.JMXConfigurator]