Define logback shutdown hook in Spring Boot -


i using asyncappender in spring-boot (1.5.3.release) application.

logback.xml

<appender name="file_async" class="ch.qos.logback.classic.asyncappender">     <queuesize>5000</queuesize>     <discardingthreshold>0</discardingthreshold>     <appender-ref ref="file" /> </appender>

as per logback documentation,

upon application shutdown or redeploy, asyncappender must stopped in order stop , reclaim worker thread , flush logging events queue.

https://logback.qos.ch/manual/appenders.html

further says:

in order avoid interrupting worker thread under these conditions, shutdown hook can inserted jvm runtime stops loggercontext after jvm shutdown has been initiated

i want know how stop asyncappender in spring boot application. @ place in spring boot, should define shutdown hook?

just add <shutdownhook/> instruction logback.xml. example:

<?xml version="1.0" encoding="utf-8"?> <configuration>      <shutdownhook class="ch.qos.logback.core.hook.delayingshutdownhook"/>      <appender name="file_async" class="ch.qos.logback.classic.asyncappender">         <queuesize>5000</queuesize>         <discardingthreshold>0</discardingthreshold>         <appender-ref ref="file" />     </appender>      <!-- rest of logback config -->  </configuration>

with in place you'll notice following log message emitted when logback configuring itself:

info in ch.qos.logback.core.joran.action.shutdownhookaction - instantiate shutdown hook of type [ch.qos.logback.core.hook.delayingshutdownhook]


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