jmx - 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 <shutdownHook/>根据文档执行以下操作的配置元素:

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

是否包括 <shutdownHook/>元素负责注销 <jmxConfigurator/> ?

Answer 1

是的，它确实。这是调试器的证明:


但是，有一些限制:

<shutdownHook/>仅从 1.1.3 版开始可用

虽然 the documentation says那朴素的<shutdownHook/>足够了，你必须指定 class属性(property):<shutdownHook class="ch.qos.logback.core.hook.DelayingShutdownHook"/>否则 logback 会提示:

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

To make sure that the JMXConfigurator gets stopped enable debug mode on the logback configuration:

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

然后在日志的末尾，您会看到:

ch.qos.logback.core.hook.DelayingShutdownHook@1a246fc6 中的信息 - 通过关闭 Hook 关闭 Logback 上下文
ch.qos.logback.classic.jmx.JMXConfigurator(default) 中的信息 - onReset() 方法称为 JMXActivator [ch.qos.logback.classic:Name=default,Type=ch.qos.logback.classic.jmx.JMXConfigurator]