问题
I am launching tomcat using Intellij with maven support. Once I add the following tomcat maven dependency:
<!-- https://mvnrepository.com/artifact/org.apache.tomcat/tomcat-catalina -->
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-catalina</artifactId>
<version>8.5.38</version>
</dependency>
Upon launching, it will throw this exception:
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:269)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationListenerAnnotations(WebAnnotationSet.java:89)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:67)
at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:328)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:772)
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:5181)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 44 more
Caused by: java.lang.ClassNotFoundException: org.slf4j.Logger
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1364)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1185)
... 57 more
25-Feb-2019 00:51:29.242 SEVERE [RMI TCP Connection(4)-127.0.0.1] org.apache.tomcat.util.modeler.BaseModelMBean.invoke Exception invoking method manageApp
java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/web_war_exploded]]
I have checked that my dependency of slf4j is:
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.22</version>
</dependency>
And it shows that it has class org.slf4j.Logger:
If I remove the tomcat dependency, everything works fine again.
Update:
My pom file:
<?xml version="1.0" encoding="UTF-8"?>
http://maven.apache.org/xsd/maven-4.0.0.xsd"> 4.0.0
<groupId>chrisTina</groupId>
<artifactId>Insbot</artifactId>
<version>1.0-SNAPSHOT</version>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>8</source>
<target>8</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-java</artifactId>
<version>3.8.1</version>
</dependency>
<!--<dependency>-->
<!--<groupId>org.apache.logging.log4j</groupId>-->
<!--<artifactId>log4j-slf4j-impl</artifactId>-->
<!--<version>2.11.1</version>-->
<!--</dependency>-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.4</version>
<scope>provided</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/com.typesafe/config -->
<dependency>
<groupId>com.typesafe</groupId>
<artifactId>config</artifactId>
<version>1.2.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.8.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.awaitility/awaitility -->
<dependency>
<groupId>org.awaitility</groupId>
<artifactId>awaitility</artifactId>
<version>3.1.6</version>
<!--<scope>test</scope>-->
</dependency>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.15</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-core -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.4.1.Final</version>
</dependency>
<!-- https://mvnrepository.com/artifact/net.bytebuddy/byte-buddy -->
<dependency>
<groupId>net.bytebuddy</groupId>
<artifactId>byte-buddy</artifactId>
<version>1.9.10</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.guava/guava -->
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>23.0</version>
</dependency>
<!--<!– https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api –>-->
<!--<dependency>-->
<!--<groupId>javax.servlet</groupId>-->
<!--<artifactId>javax.servlet-api</artifactId>-->
<!--<version>4.0.1</version>-->
<!--<scope>provided</scope>-->
<!--</dependency>-->
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.22</version>
</dependency>
<!--<!– https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 –>-->
<!--<dependency>-->
<!--<groupId>org.slf4j</groupId>-->
<!--<artifactId>slf4j-log4j12</artifactId>-->
<!--<version>1.7.22</version>-->
<!--</dependency>-->
<!-- https://mvnrepository.com/artifact/org.apache.tomcat/tomcat-catalina -->
<!--<dependency>-->
<!--<groupId>org.apache.tomcat</groupId>-->
<!--<artifactId>tomcat-catalina</artifactId>-->
<!--<version>8.5.38</version>-->
<!--</dependency>-->
</dependencies>
<packaging>war</packaging>
MVN output:
[INFO] --- maven-dependency-plugin:2.8:tree (default-cli) @ Insbot ---
[INFO] chrisTina:Insbot:war:1.0-SNAPSHOT
[INFO] +- org.seleniumhq.selenium:selenium-java:jar:3.8.1:compile
[INFO] | +- org.seleniumhq.selenium:selenium-api:jar:3.8.1:compile
[INFO] | +- org.seleniumhq.selenium:selenium-chrome-driver:jar:3.8.1:compile
[INFO] | +- org.seleniumhq.selenium:selenium-edge-driver:jar:3.8.1:compile
[INFO] | +- org.seleniumhq.selenium:selenium-firefox-driver:jar:3.8.1:compile
[INFO] | +- org.seleniumhq.selenium:selenium-ie-driver:jar:3.8.1:compile
[INFO] | +- org.seleniumhq.selenium:selenium-opera-driver:jar:3.8.1:compile
[INFO] | +- org.seleniumhq.selenium:selenium-remote-driver:jar:3.8.1:compile
[INFO] | +- org.seleniumhq.selenium:selenium-safari-driver:jar:3.8.1:compile
[INFO] | +- org.seleniumhq.selenium:selenium-support:jar:3.8.1:compile
[INFO] | +- org.apache.commons:commons-exec:jar:1.3:compile
[INFO] | +- commons-codec:commons-codec:jar:1.10:compile
[INFO] | +- commons-logging:commons-logging:jar:1.2:compile
[INFO] | +- com.google.code.gson:gson:jar:2.8.2:compile
[INFO] | +- org.apache.httpcomponents:httpclient:jar:4.5.3:compile
[INFO] | \- org.apache.httpcomponents:httpcore:jar:4.4.6:compile
[INFO] +- org.projectlombok:lombok:jar:1.18.4:provided
[INFO] +- com.typesafe:config:jar:1.2.0:compile
[INFO] +- org.apache.commons:commons-lang3:jar:3.8.1:compile
[INFO] +- org.awaitility:awaitility:jar:3.1.6:compile
[INFO] | +- org.hamcrest:hamcrest-library:jar:1.3:compile
[INFO] | +- org.hamcrest:hamcrest-core:jar:1.3:compile
[INFO] | \- org.objenesis:objenesis:jar:2.6:compile
[INFO] +- mysql:mysql-connector-java:jar:8.0.15:compile
[INFO] | \- com.google.protobuf:protobuf-java:jar:3.6.1:compile
[INFO] +- org.hibernate:hibernate-core:jar:5.4.1.Final:compile
[INFO] | +- org.jboss.logging:jboss-logging:jar:3.3.2.Final:compile
[INFO] | +- javax.persistence:javax.persistence-api:jar:2.2:compile
[INFO] | +- org.javassist:javassist:jar:3.24.0-GA:compile
[INFO] | +- antlr:antlr:jar:2.7.7:compile
[INFO] | +- org.jboss.spec.javax.transaction:jboss-transaction-api_1.2_spec:jar:1.1.1.Final:compile
[INFO] | +- org.jboss:jandex:jar:2.0.5.Final:compile
[INFO] | +- com.fasterxml:classmate:jar:1.3.4:compile
[INFO] | +- javax.activation:javax.activation-api:jar:1.2.0:compile
[INFO] | +- org.dom4j:dom4j:jar:2.1.1:compile
[INFO] | +- org.hibernate.common:hibernate-commons-annotations:jar:5.1.0.Final:compile
[INFO] | +- javax.xml.bind:jaxb-api:jar:2.3.1:compile
[INFO] | \- org.glassfish.jaxb:jaxb-runtime:jar:2.3.1:compile
[INFO] | +- org.glassfish.jaxb:txw2:jar:2.3.1:compile
[INFO] | +- com.sun.istack:istack-commons-runtime:jar:3.0.7:compile
[INFO] | +- org.jvnet.staxex:stax-ex:jar:1.8:compile
[INFO] | \- com.sun.xml.fastinfoset:FastInfoset:jar:1.2.15:compile
[INFO] +- net.bytebuddy:byte-buddy:jar:1.9.10:compile
[INFO] +- com.google.guava:guava:jar:23.0:compile
[INFO] | +- com.google.code.findbugs:jsr305:jar:1.3.9:compile
[INFO] | +- com.google.errorprone:error_prone_annotations:jar:2.0.18:compile
[INFO] | +- com.google.j2objc:j2objc-annotations:jar:1.1:compile
[INFO] | \- org.codehaus.mojo:animal-sniffer-annotations:jar:1.14:compile
[INFO] +- org.slf4j:slf4j-api:jar:1.7.22:compile
[INFO] \- org.apache.tomcat:tomcat-catalina:jar:8.5.38:compile
[INFO] +- org.apache.tomcat:tomcat-servlet-api:jar:8.5.38:compile
[INFO] +- org.apache.tomcat:tomcat-jsp-api:jar:8.5.38:compile
[INFO] | \- org.apache.tomcat:tomcat-el-api:jar:8.5.38:compile
[INFO] +- org.apache.tomcat:tomcat-juli:jar:8.5.38:compile
[INFO] +- org.apache.tomcat:tomcat-annotations-api:jar:8.5.38:compile
[INFO] +- org.apache.tomcat:tomcat-api:jar:8.5.38:compile
[INFO] +- org.apache.tomcat:tomcat-jni:jar:8.5.38:compile
[INFO] +- org.apache.tomcat:tomcat-coyote:jar:8.5.38:compile
[INFO] +- org.apache.tomcat:tomcat-util:jar:8.5.38:compile
[INFO] +- org.apache.tomcat:tomcat-util-scan:jar:8.5.38:compile
[INFO] \- org.apache.tomcat:tomcat-jaspic-api:jar:8.5.38:compile
回答1:
You need to add the .jar files to lib folder $TOMCAT/webapps/$YOUR_WEB_APP/WEB-INF/lib/
回答2:
adding an answer here just because this question was the first relevant search result when i was trying to investigate a slightly different issue : running an application with Eclipse and Tomcat - same error would appear. I never realized that Eclipse (sometimes? was it particular to my flavour?) wouldn't copy the lib directory from within the Maven-generated WAR file - so even though the necessary jar files were inside WAR, Eclipse wasn't using them - it uses some kind of exploded structure when it comes to running/debugging on server (Tomcat in particular), within wtpwebapps directory of the Tomcat server. So as others have pointed out in other questions that needed to be dug out, it is necessary to add Java Build Path Entries - Maven Dependencies to Deployment Assembly via Project Properties - it is possible that a similar thing would happen with other tools
P.S. and yes, as others have pointed out, doing Maven -> Update Project in Eclipse often messes up the aforementioned configuration
P.P.S. I am sorry, Eclipse - the above was because of my seedy pom.xml configuration - what Eclipse does during each Maven -> Update Project is to copy whatever configuration is in pom.xml to its own project configuration - so when the dependencies are not explicitly said to be copied in the pom.xml, they are not copied (Project properties are reset) - I have fixed this issue following the answer from here
来源：https://stackoverflow.com/questions/54860329/java-lang-noclassdeffounderror-lorg-slf4j-logger