java - Spring @PreDestroy : No logging because Logback stops too soon

Question

在我的项目中，我使用 Logback 作为日志工具。我有以下类(class)

@Component
class Test {
    @PreDestroy
    public void destroy() {
        try {
            ...
        } catch (Exception e) {
            LoggerFactory.getLogger(getClass()).error(e.getLocalizedMessage(), e);
        }
    }
}

现在，我取消部署 servlet。发生异常时，Logback 不会打印消息和堆栈跟踪。这是因为在 Spring 调用 destroy() 之前，Logback 正在清理。取消部署 servlet 时，这是第一行(也是最后一行)日志行:

15:46:19,084 |-INFO in ch.qos.logback.classic.servlet.LogbackServletContextListener@7957fe56 - About to stop ch.qos.logback.classic.LoggerContext [default]

我通过在 destroy() 中添加 System.out.println("..."); 来验证 Logback 首先停止。

有什么办法可以解决这个问题吗？

我的依赖项:

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-framework-bom</artifactId>
            <version>5.0.1.RELEASE</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>99-empty</version>
        </dependency>
    </dependencies>
</dependencyManagement>

<dependencies>
    <dependency>
        <groupId>commons-logging</groupId>
        <artifactId>commons-logging</artifactId>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.25</version>
    </dependency>
    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-core</artifactId>
        <version>1.2.3</version>
    </dependency>
    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-classic</artifactId>
        <version>1.2.3</version>
    </dependency>
    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-access</artifactId>
        <version>1.2.3</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jcl</artifactId>
    </dependency>
</dependencies>

请注意，spring-jcl 用于将 commons-logging 路由到 slf4j(它将路由到 logback)。我没有使用 jcl-over-slf4j。

Answer 1

有一个documented way禁用以禁用 LogbackServletContextListener 的注册:

You may disable the automatic the installation of LogbackServletContextListener by setting a named logbackDisableServletContainerInitializer in your web-application's web.xml file. Here is the relevant snippet.

<web-app>
    <context-param>
        <param-name>logbackDisableServletContainerInitializer</param-name>
        <param-value>true</param-value>
    </context-param>
    .... 
</web-app>

Note that logbackDisableServletContainerInitializer variable can also be set as a Java system property an OS environment variable. The most local setting has priority, i.e. web-app first, system property second and OS environment last.

如果是这种情况，我想您可能想要编写自己的关闭钩子(Hook)并停止 LoggerContext