java lang ClassNotFoundException org springframework boot SpringApplication Maven

Question

I m trying to create a spring mvc application  This is my pom xml   lt  xml version  1 0  encoding  UTF-8   gt   lt project xmlns  http   maven apache org POM 4 0 0  xmlns xsi  http   www w3 org 2001 XMLSchema-instance      xsi schemaLocation  http   maven apache org POM 4 0 0 http   maven apache org maven-v4 0 0 xsd  gt       lt modelVersion gt 4 0 0 lt  modelVersion gt       lt groupId gt com acme lt  groupId gt       lt artifactId gt test lt  artifactId gt       lt name gt springmvc lt  name gt       lt packaging gt jar lt  packaging gt       lt version gt 1 0 0-BUILD-SNAPSHOT lt  version gt       lt properties gt           lt org springframework-version gt 3 1 1 RELEASE lt  org springframework-version gt           lt org aspectj-version gt 1 6 10 lt  org aspectj-version gt           lt org slf4j-version gt 1 6 6 lt  org slf4j-version gt       lt  properties gt        lt repositories gt           lt repository gt               lt id gt spring-milestone lt  id gt               lt url gt http   repo spring io libs-milestone lt  url gt               lt snapshots gt                   lt enabled gt false lt  enabled gt               lt  snapshots gt           lt  repository gt       lt  repositories gt        lt pluginRepositories gt           lt pluginRepository gt               lt id gt spring-milestone lt  id gt               lt url gt http   repo spring io libs-milestone lt  url gt               lt snapshots gt                   lt enabled gt false lt  enabled gt               lt  snapshots gt           lt  pluginRepository gt       lt  pluginRepositories gt        lt dependencies gt           lt  -- Spring -- gt           lt dependency gt               lt groupId gt org springframework lt  groupId gt               lt artifactId gt spring-context lt  artifactId gt               lt version gt   org springframework-version  lt  version gt               lt exclusions gt                   lt  -- Exclude Commons Logging in favor of SLF4j -- gt                   lt exclusion gt                       lt groupId gt commons-logging lt  groupId gt                       lt artifactId gt commons-logging lt  artifactId gt                   lt  exclusion gt               lt  exclusions gt           lt  dependency gt           lt dependency gt               lt groupId gt org springframework lt  groupId gt               lt artifactId gt spring-webmvc lt  artifactId gt               lt version gt   org springframework-version  lt  version gt           lt  dependency gt            lt  -- AspectJ -- gt           lt dependency gt               lt groupId gt org aspectj lt  groupId gt               lt artifactId gt aspectjrt lt  artifactId gt               lt version gt   org aspectj-version  lt  version gt           lt  dependency gt            lt  -- Logging -- gt           lt dependency gt               lt groupId gt org slf4j lt  groupId gt               lt artifactId gt slf4j-api lt  artifactId gt               lt version gt   org slf4j-version  lt  version gt           lt  dependency gt           lt dependency gt               lt groupId gt org slf4j lt  groupId gt               lt artifactId gt jcl-over-slf4j lt  artifactId gt               lt version gt   org slf4j-version  lt  version gt               lt scope gt runtime lt  scope gt           lt  dependency gt           lt dependency gt               lt groupId gt org slf4j lt  groupId gt               lt artifactId gt slf4j-log4j12 lt  artifactId gt               lt version gt   org slf4j-version  lt  version gt               lt scope gt runtime lt  scope gt           lt  dependency gt           lt dependency gt               lt groupId gt log4j lt  groupId gt               lt artifactId gt log4j lt  artifactId gt               lt version gt 1 2 15 lt  version gt               lt exclusions gt                   lt exclusion gt                       lt groupId gt javax mail lt  groupId gt                       lt artifactId gt mail lt  artifactId gt                   lt  exclusion gt                   lt exclusion gt                       lt groupId gt javax jms lt  groupId gt                       lt artifactId gt jms lt  artifactId gt                   lt  exclusion gt                   lt exclusion gt                       lt groupId gt com sun jdmk lt  groupId gt                       lt artifactId gt jmxtools lt  artifactId gt                   lt  exclusion gt                   lt exclusion gt                       lt groupId gt com sun jmx lt  groupId gt                       lt artifactId gt jmxri lt  artifactId gt                   lt  exclusion gt               lt  exclusions gt               lt scope gt runtime lt  scope gt           lt  dependency gt            lt  --  Inject -- gt           lt dependency gt               lt groupId gt javax inject lt  groupId gt               lt artifactId gt javax inject lt  artifactId gt               lt version gt 1 lt  version gt           lt  dependency gt            lt  -- Servlet -- gt           lt dependency gt               lt groupId gt javax servlet lt  groupId gt               lt artifactId gt servlet-api lt  artifactId gt               lt version gt 2 5 lt  version gt               lt scope gt provided lt  scope gt           lt  dependency gt           lt dependency gt               lt groupId gt javax servlet jsp lt  groupId gt               lt artifactId gt jsp-api lt  artifactId gt               lt version gt 2 1 lt  version gt               lt scope gt provided lt  scope gt           lt  dependency gt           lt dependency gt               lt groupId gt javax servlet lt  groupId gt               lt artifactId gt jstl lt  artifactId gt               lt version gt 1 2 lt  version gt           lt  dependency gt            lt  -- Test -- gt           lt dependency gt               lt groupId gt junit lt  groupId gt               lt artifactId gt junit lt  artifactId gt               lt version gt 4 7 lt  version gt               lt scope gt test lt  scope gt           lt  dependency gt            lt  -- Boot -- gt           lt dependency gt               lt groupId gt org springframework boot lt  groupId gt               lt artifactId gt spring-boot-starter-web lt  artifactId gt               lt version gt 0 5 0 M6 lt  version gt               lt exclusions gt                   lt exclusion gt                       lt groupId gt org springframework boot lt  groupId gt                       lt artifactId gt spring-boot-starter-tomcat lt  artifactId gt                   lt  exclusion gt               lt  exclusions gt           lt  dependency gt           lt dependency gt               lt groupId gt org springframework boot lt  groupId gt               lt artifactId gt spring-boot-starter-jetty lt  artifactId gt               lt version gt 0 5 0 M6 lt  version gt           lt  dependency gt           lt dependency gt               lt groupId gt org springframework boot lt  groupId gt               lt artifactId gt spring-boot-starter-actuator lt  artifactId gt               lt version gt 0 5 0 M6 lt  version gt           lt  dependency gt         lt  dependencies gt       lt build gt           lt plugins gt               lt plugin gt                   lt artifactId gt maven-eclipse-plugin lt  artifactId gt                   lt version gt 2 9 lt  version gt                   lt configuration gt                       lt additionalProjectnatures gt                           lt projectnature gt org springframework ide eclipse core springnature lt  projectnature gt                       lt  additionalProjectnatures gt                       lt additionalBuildcommands gt                           lt buildcommand gt org springframework ide eclipse core springbuilder lt  buildcommand gt                       lt  additionalBuildcommands gt                       lt downloadSources gt true lt  downloadSources gt                       lt downloadJavadocs gt true lt  downloadJavadocs gt                   lt  configuration gt               lt  plugin gt               lt plugin gt                   lt groupId gt org apache maven plugins lt  groupId gt                   lt artifactId gt maven-compiler-plugin lt  artifactId gt                   lt version gt 2 5 1 lt  version gt                   lt configuration gt                       lt source gt 1 6 lt  source gt                       lt target gt 1 6 lt  target gt                       lt compilerArgument gt -Xlint all lt  compilerArgument gt                       lt showWarnings gt true lt  showWarnings gt                       lt showDeprecation gt true lt  showDeprecation gt                   lt  configuration gt               lt  plugin gt               lt  -- com ilppa cocktail Application -- gt               lt plugin gt                   lt groupId gt org apache maven plugins lt  groupId gt                   lt artifactId gt maven-jar-plugin lt  artifactId gt                   lt version gt 2 4 lt  version gt                   lt configuration gt                       lt archive gt                           lt manifest gt                               lt mainClass gt com ilppa cocktail Application lt  mainClass gt                           lt  manifest gt                       lt  archive gt                   lt  configuration gt               lt  plugin gt               lt plugin gt                   lt groupId gt org codehaus mojo lt  groupId gt                   lt artifactId gt exec-maven-plugin lt  artifactId gt                   lt version gt 1 2 1 lt  version gt                   lt configuration gt                       lt mainClass gt org test int1 Main lt  mainClass gt                   lt  configuration gt               lt  plugin gt               lt plugin gt                   lt groupId gt org springframework boot lt  groupId gt                   lt artifactId gt spring-boot-maven-plugin lt  artifactId gt               lt  plugin gt           lt  plugins gt       lt  build gt   lt  project gt    when I run mvn clean install the  jar is generated but when I launch it java -jar target test-1 0 0-BUILD-SNAPSHOT jar  I have an error   Exception in thread  main  java lang NoClassDefFoundError  org springframework boot SpringApplication     at com acme test Application main Application java 12  Caused by  java lang ClassNotFoundException  org springframework boot SpringApplication     at java net URLClassLoader 1 run URLClassLoader java 366      at java net URLClassLoader 1 run URLClassLoader java 355      at java security AccessController doPrivileged Native Method      at java net URLClassLoader findClass URLClassLoader java 354      at java lang ClassLoader loadClass ClassLoader java 425      at sun misc Launcher AppClassLoader loadClass Launcher java 308      at java lang ClassLoader loadClass ClassLoader java 358          1 more   I don t understand  I have no errors in eclipse  I think the  jar is in maven depences

User · Answer

Mine was caused by a corrupt Maven repository.

I deleted everything under C:\Users\<me>\.m2\repository.

Then did an Eclipse Maven Update, and it worked first time.

So it was simply spring-boot.jar got corrupted.

User · Answer

The answer to the above question is  none of the above   When you download new STS it won t support the old Spring Boot parent version  Just update parent version with latest comes with STS it will work    lt parent gt       lt groupId gt org springframework boot lt  groupId gt       lt artifactId gt spring-boot-starter-parent lt  artifactId gt       lt version gt 1 5 8 RELEASE lt  version gt       lt relativePath  gt   lt  -- lookup parent from repository -- gt   lt  parent gt    If you have problem getting the latest  just create a new Spring Starter Project  Go to File- New- Spring Start Project and create a demo project you will get the latest parent version  change your version with that all will work  I do this every time I change STS

User · Answer

May be your dependencies not build correctly  Check compilation issue in project   Clean and rebuild project   For maven project  mvn clean install  For gradle projects  gradle clean build or gradlew clean build

User · Answer

Clean your maven cache and rerun   mvn dependency purge-local-repository

User · Answer

Here the packaging is jar type  hence you need to use manifest plugin  in order to add dependencies into the Manifest mf  The problem here is that maven could find the dependencies in pom file and compile the source code and create the output jar  But when executing the jar  manifest mf file contains no details of dependencies  Hence you got this error  This is a case of classpath errors   Here you can find the details on how to do it

User · Answer

Clearing metadata helped me or change the workspace

User · Answer

Adding below to pom xml solved my problem   lt project xmlns  http   maven apache org POM 4 0 0  xmlns xsi  http   www w3 org 2001 XMLSchema-instance      xsi schemaLocation  http   maven apache org POM 4 0 0 http   maven apache org xsd maven-4 0 0 xsd  gt

User · Answer

Your jar does not contain the dependencies such as spring-boot which it is looking for during runtime  You can build a consolidated jar with all the dependencies as outlined in this question

User · Answer

Another option is to use the Apache Maven Shade Plugin  This plugin provides the capability to package the artifact in an uber-jar  including its dependencies and to shade - i e  rename - the packages of some of the dependencies   add this to your build plugins section   lt plugin gt        lt groupId gt org apache maven plugins lt  groupId gt        lt artifactId gt maven-shade-plugin lt  artifactId gt   lt  plugin gt

User · Answer

I had the same problem and tried most of the solutions suggested above  but none  worked for me  Eventually  I rebuild my entire com springframework  maven  repository  by simply deleting  m2 org springworkframework directory     It worked for me

User · Answer

In my case  I did remove maven nature manually from  project file while having the project opened in Eclipse  So what I d to do was to add maven nature again using the contextual menu  roght click on the project   configuration   add maven nature   Afterwards  everything worked nice  D

User · Answer

If you are running spring cloud application  make sure your boot version matches   cloud version  You can check the version compatibility matrix at the bottom of this page   https   spring io projects spring-cloud

User · Answer

If you would like to stay in spring boot space just set the pom packaging to jar    lt packaging gt jar lt  packaging gt    and add the spring-boot-maven-plugin to you build properties in the pom xml file     lt build gt     lt plugins gt       lt plugin gt         lt groupId gt org springframework boot lt  groupId gt         lt artifactId gt spring-boot-maven-plugin lt  artifactId gt       lt  plugin gt     lt  plugins gt   lt  build gt    then a simple mvn package command will create a complete executable jar file   See the very good spring reference doc for more details  doing it gradle style also  spring reference doc

[java] java.lang.ClassNotFoundException: org.springframework.boot.SpringApplication Maven

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