Java.lang.NoClassDefFoundError: org / slf4j / LoggerFactory Spring boot 1.5.2 maven
I am following this tutorial https://spring.io/guides/gs/rest-service/ to create a soothing app. when i run this app (run as spring boot app) from spring toolkit it throws error:
Caused by: java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory
at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:155)
at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:132)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:273)
at org.springframework.boot.SpringApplication.<clinit>(SpringApplication.java:190)
at webapp.Application.main(Application.java:9)
... 6 more
Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory
the same error also occurs when I tried to use the initializr project ( https://start.spring.io/ ).
my pom.xml is exactly like the tutorial:
<?xml version="1.0" encoding="UTF-8"?>
http://maven.apache.org/xsd/maven-4.0.0.xsd "> 4.0.0
<groupId>com.rondox.sb.restfulws</groupId>
<artifactId>wawa</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>wawa</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.2.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.jayway.jsonpath</groupId>
<artifactId>json-path</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-releases</id>
<url>https://repo.spring.io/libs-release</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-releases</id>
<url>https://repo.spring.io/libs-release</url>
</pluginRepository>
</pluginRepositories>
my dependency tree:
[INFO] --- maven-dependency-plugin:2.10:tree (default-cli) @ wawa ---
[INFO] com.rondox.sb.restfulws:wawa:jar:0.0.1-SNAPSHOT
[INFO] +- org.springframework.boot:spring-boot-starter-web:jar:1.5.2.RELEASE:compile
[INFO] | +- org.springframework.boot:spring-boot-starter:jar:1.5.2.RELEASE:compile
[INFO] | | +- org.springframework.boot:spring-boot:jar:1.5.2.RELEASE:compile
[INFO] | | +- org.springframework.boot:spring-boot-autoconfigure:jar:1.5.2.RELEASE:compile
[INFO] | | +- org.springframework.boot:spring-boot-starter-logging:jar:1.5.2.RELEASE:compile
[INFO] | | | +- ch.qos.logback:logback-classic:jar:1.1.11:compile
[INFO] | | | | \- ch.qos.logback:logback-core:jar:1.1.11:compile
[INFO] | | | +- org.slf4j:jcl-over-slf4j:jar:1.7.24:compile
[INFO] | | | +- org.slf4j:jul-to-slf4j:jar:1.7.24:compile
[INFO] | | | \- org.slf4j:log4j-over-slf4j:jar:1.7.24:compile
[INFO] | | \- org.yaml:snakeyaml:jar:1.17:runtime
[INFO] | +- org.springframework.boot:spring-boot-starter-tomcat:jar:1.5.2.RELEASE:compile
[INFO] | | +- org.apache.tomcat.embed:tomcat-embed-core:jar:8.5.11:compile
[INFO] | | +- org.apache.tomcat.embed:tomcat-embed-el:jar:8.5.11:compile
[INFO] | | \- org.apache.tomcat.embed:tomcat-embed-websocket:jar:8.5.11:compile
[INFO] | +- org.hibernate:hibernate-validator:jar:5.3.4.Final:compile
[INFO] | | +- javax.validation:validation-api:jar:1.1.0.Final:compile
[INFO] | | +- org.jboss.logging:jboss-logging:jar:3.3.0.Final:compile
[INFO] | | \- com.fasterxml:classmate:jar:1.3.3:compile
[INFO] | +- com.fasterxml.jackson.core:jackson-databind:jar:2.8.7:compile
[INFO] | | +- com.fasterxml.jackson.core:jackson-annotations:jar:2.8.0:compile
[INFO] | | \- com.fasterxml.jackson.core:jackson-core:jar:2.8.7:compile
[INFO] | +- org.springframework:spring-web:jar:4.3.7.RELEASE:compile
[INFO] | | +- org.springframework:spring-aop:jar:4.3.7.RELEASE:compile
[INFO] | | +- org.springframework:spring-beans:jar:4.3.7.RELEASE:compile
[INFO] | | \- org.springframework:spring-context:jar:4.3.7.RELEASE:compile
[INFO] | \- org.springframework:spring-webmvc:jar:4.3.7.RELEASE:compile
[INFO] | \- org.springframework:spring-expression:jar:4.3.7.RELEASE:compile
[INFO] +- org.springframework.boot:spring-boot-starter-test:jar:1.5.2.RELEASE:test
[INFO] | +- org.springframework.boot:spring-boot-test:jar:1.5.2.RELEASE:test
[INFO] | +- org.springframework.boot:spring-boot-test-autoconfigure:jar:1.5.2.RELEASE:test
[INFO] | +- junit:junit:jar:4.12:test
[INFO] | +- org.assertj:assertj-core:jar:2.6.0:test
[INFO] | +- org.mockito:mockito-core:jar:1.10.19:test
[INFO] | | \- org.objenesis:objenesis:jar:2.1:test
[INFO] | +- org.hamcrest:hamcrest-core:jar:1.3:test
[INFO] | +- org.hamcrest:hamcrest-library:jar:1.3:test
[INFO] | +- org.skyscreamer:jsonassert:jar:1.4.0:test
[INFO] | | \- com.vaadin.external.google:android-json:jar:0.0.20131108.vaadin1:test
[INFO] | +- org.springframework:spring-core:jar:4.3.7.RELEASE:compile
[INFO] | \- org.springframework:spring-test:jar:4.3.7.RELEASE:test
[INFO] \- com.jayway.jsonpath:json-path:jar:2.2.0:test
[INFO] +- net.minidev:json-smart:jar:2.2.1:test
[INFO] | \- net.minidev:accessors-smart:jar:1.1:test
[INFO] | \- org.ow2.asm:asm:jar:5.0.3:test
[INFO] \- org.slf4j:slf4j-api:jar:1.7.24:compile
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.750 s
[INFO] Finished at: 2017-04-09T12:05:22+07:00
tried this solution ClassNotFoundException: org.slf4j.LoggerFactory to add the last jar to the classpath, but it gave another error:
SLF4J: Class path contains multiple SLF4J bindings.
please throw some enlightenment, I have been struggling for this issue for 3 days.
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4 answers
You have more than one logger in your dependencies and slf4j doesn't know which one to use. You have to check the Maven dependency tree to fix it.
logback-classic <-> log4j-over-slf4j <-> jboss-logging (?)
You can exclude Spring Boot Logging (Logback) by default) and declare Log4j2 manually:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>
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after a few times of trial and error, i found out that my slf4j container is corrupted. I see this when I run the mvn package command and there is a warning. i renamed the jar, then it will reload the jar. once the jar is intact, then the application encounters another error. I was just following this Spring Boot source : New Project - UnsatisfiedDependencyException: Error creating a bean named 'methodValidationPostProcessor' to add a hibernate exclusive validator. after that I can run the application normally. thanks everyone.
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