Log4j 删除问题

Question

我正在尝试从我的项目中删除 Log4j。 该项目在删除后成功构建，但在运行构建时出现此错误。

org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/azuga]]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162) 
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:755)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:731)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
    at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:973)
    at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1850)
    at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at java.base/java.lang.Thread.run(Thread.java:834)
 Caused by: java.lang.NoClassDefFoundError: Lorg/apache/log4j/Logger;
    at java.base/java.lang.Class.getDeclaredFields0(Native Method)
    at java.base/java.lang.Class.privateGetDeclaredFields(Class.java:3062)
    at java.base/java.lang.Class.getDeclaredFields(Class.java:2249)
    at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:106)
    at org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:269)
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationFilterAnnotations(WebAnnotationSet.java:109)
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:68)
    at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:336)
    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:776)
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:307)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:95)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5262)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
    ... 10 more
 Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Logger
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1352)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1180)
    ... 24 more

我尝试删除我怀疑使用 Log4j 的依赖项。

Answer 1

作为一般建议，使用工具来管理项目的依赖关系，例如 Gradle 或 Maven。这些工具不仅能够分析类路径依赖关系，还能够分析运行时依赖关系。 这样，您就可以看到依赖项是什么 - 而不是怀疑。