tomcat - 重新部署时使用 Janino + Logback + Tomcat 的 sun.reflect.MethodAccessorImpl 的 ClassNotFoundException

Question

我在 tomcat 8.5.32(最新的 java 8、1.8.0_181)下部署了一个应用程序，使用最新的 logback 1.2.3、janino 3.0.8 和 slf4f 1.7.25。

我的 logback xml 有一个像这样的过滤器:

<filter class="ch.qos.logback.core.filter.EvaluatorFilter">   
<evaluator> 
        <expression>return message != null &amp;&amp; message.contains("127.0.0.1");
</expression>   
</evaluator>   
<OnMismatch>NEUTRAL</OnMismatch>   
<OnMatch>DENY</OnMatch>
</filter>

在我重新部署之前一切正常。然后我得到这样的异常:

Jul 30, 2018 8:00:18 AM org.apache.catalina.startup.HostConfig reload
WARNING: Error during context [] restart
org.apache.catalina.LifecycleException: Failed to stop component [StandardEngine[Catalina-b].StandardHost[localhost].StandardContext[]]
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:238)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:142)
        at org.apache.catalina.startup.HostConfig.reload(HostConfig.java:1386)
        at org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1287)
        at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1586)
        at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:280)
        at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:94)
        at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1136)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1372)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1376)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1344)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NoClassDefFoundError: sun/reflect/MethodAccessorImpl
        at sun.misc.Unsafe.defineClass(Native Method)
        at sun.reflect.ClassDefiner.defineClass(ClassDefiner.java:63)
        at sun.reflect.MethodAccessorGenerator$1.run(MethodAccessorGenerator.java:399)
        at sun.reflect.MethodAccessorGenerator$1.run(MethodAccessorGenerator.java:394)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.reflect.MethodAccessorGenerator.generate(MethodAccessorGenerator.java:393)
        at sun.reflect.MethodAccessorGenerator.generateMethod(MethodAccessorGenerator.java:75)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:53)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.codehaus.janino.ScriptEvaluator.evaluate(ScriptEvaluator.java:756)
        at org.codehaus.janino.ScriptEvaluator.evaluate(ScriptEvaluator.java:748)
        at ch.qos.logback.core.boolex.JaninoEventEvaluatorBase.evaluate(JaninoEventEvaluatorBase.java:72)
        at ch.qos.logback.core.filter.EvaluatorFilter.decide(EvaluatorFilter.java:65)
        at ch.qos.logback.core.spi.FilterAttachableImpl.getFilterChainDecision(FilterAttachableImpl.java:52)
        at ch.qos.logback.core.AppenderBase.getFilterChainDecision(AppenderBase.java:134)
        at ch.qos.logback.core.AppenderBase.doAppend(AppenderBase.java:80)
        at ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:48)
        at ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:272)
        at ch.qos.logback.classic.Logger.callAppenders(Logger.java:259)
        at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:441)
        at ch.qos.logback.classic.Logger.filterAndLog_0_Or3Plus(Logger.java:395)
        at ch.qos.logback.classic.Logger.log(Logger.java:787)
        at org.slf4j.bridge.SLF4JBridgeHandler.callLocationAwareLogger(SLF4JBridgeHandler.java:224)
        at org.slf4j.bridge.SLF4JBridgeHandler.publish(SLF4JBridgeHandler.java:301)
        at java.util.logging.Logger.log(Logger.java:738)
        at java.util.logging.Logger.doLog(Logger.java:765)
        at java.util.logging.Logger.logp(Logger.java:1042)
        at org.apache.juli.logging.DirectJDKLog.log(DirectJDKLog.java:181)
        at org.apache.juli.logging.DirectJDKLog.error(DirectJDKLog.java:147)
        at org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:4780)
        at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5411)
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:226)
        ... 11 more
Caused by: java.lang.ClassNotFoundException: sun.reflect.MethodAccessorImpl
        at org.codehaus.janino.ByteArrayClassLoader.findClass(ByteArrayClassLoader.java:68)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 44 more

我的理论是 juli->SLF4J->logback->janino 最终使用最终停止的容器类加载器，但日志框架没有意识到这一点。

关于如何解决这个问题有什么想法吗？

Answer 1

原来是我的web.xml中logback监听器不是第一个导致的问题

<listener>
    <listener-class>ch.qos.logback.classic.selector.servlet.ContextDetachingSCL</listener-class>
</listener>

https://logback.qos.ch/manual/loggingSeparation.html明确说明:

Most containers invoke the contextInitialized() method of listeners in the order in which they are declared but invoke their contextDestroyed() method in reverse order. It follows that if you have multiple ServletContextListener declarations in your web.xml, then ContextDetachingSCL should be declared first so that its contextDestroyed() method is invoked last during application shutdown.