在 Intellij idea Ultimate2017.2 中运行 maven webapp 时出错：原因：java.lang.NoClassDefFoundError: Lorg/slf4j/Lo

Posted 2023-02-16

【中文标题】在 Intellij idea Ultimate2017.2 中运行 maven webapp 时出错：原因：java.lang.NoClassDefFoundError: Lorg/slf4j/Logger

【英文标题】：Error when run maven webapp in Intellij idea ultimate2017.2: Caused by: java.lang.NoClassDefFoundError: Lorg/slf4j/Logger

【发布时间】：2017-07-20 11:21:50

【问题描述】：

我将一个现有的maven项目导入Intellij idea Ultimate2017.2，并添加了一个tomcat本地服务器，但是当我运行该项目时，出现错误：

    Caused by: java.lang.NoClassDefFoundError: Lorg/slf4j/Logger;
    at java.lang.Class.getDeclaredFields0(Native Method)
    at java.lang.Class.privateGetDeclaredFields(Class.java:2583)
    at java.lang.Class.getDeclaredFields(Class.java:1916)
    at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:110)
    at org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:262)
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationListenerAnnotations(WebAnnotationSet.java:88)
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:64)
    at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:328)
    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:778)
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:299)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:94)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5105)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    ... 42 more
Caused by: java.lang.ClassNotFoundException: org.slf4j.Logger
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1285)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1119)

我正在使用tomcat8.5.16，maven3.5.0，而pom.xml 中的slf4j 依赖项是：

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>$slf4j.version</version>
</dependency>
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>log4j-over-slf4j</artifactId>
    <version>$slf4j.version</version>
    <scope>runtime</scope>
</dependency>
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>jcl-over-slf4j</artifactId>
    <version>$slf4j.version</version>
    <scope>runtime</scope>
</dependency>
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>jul-to-slf4j</artifactId>
    <version>$slf4j.version</version>
    <scope>runtime</scope>
</dependency>

intellij 会自动将 maven 依赖添加到 web lib 中吗？在webapp/WEB_INF中找不到lib目录，如何将maven库添加到webapp中？

【问题讨论】：

尝试重新导入项目，IntelliJ IDEA 将使用所有库自动生成工件，请参阅jetbrains.com/help/idea/artifacts.html。

【参考方案1】：

应该使用 mvn 命令来构建项目。打开Run/Debug Configuration -> 选择你创建的Tomcat Server->Before launch:Maven Goal,Build Artifacts,Activate tool window -> 点击+ 并使用maven clean package