Eclipse No tests found using JUnit 5 caused by NoClassDefFoundError for LauncherFactory

Question

The problem  Whenever I run my projects JUnit test  using JUnit 5 with Java 9 and Eclipse Oxygen 1 a  I encounter the problem that eclipse can t find any tests   The description  Under the run configuration  eclipse can t even find the method which is annotated with  Test  but instead only shows me   all methods    The following picture hopefully gives a better glimps of my setup     Console output   java lang NoClassDefFoundError  org junit platform launcher core LauncherFactory     at org eclipse jdt internal junit5 runner JUnit5TestLoader  lt init gt  JUnit5TestLoader java 31      at java base jdk internal reflect NativeConstructorAccessorImpl newInstance0 Native Method      at java base jdk internal reflect NativeConstructorAccessorImpl newInstance Unknown Source      at java base jdk internal reflect DelegatingConstructorAccessorImpl newInstance Unknown Source      at java base java lang reflect Constructor newInstance Unknown Source      at java base java lang Class newInstance Unknown Source      at org eclipse jdt internal junit runner RemoteTestRunner createRawTestLoader RemoteTestRunner java 368      at org eclipse jdt internal junit runner RemoteTestRunner createLoader RemoteTestRunner java 363      at org eclipse jdt internal junit runner RemoteTestRunner defaultInit RemoteTestRunner java 307      at org eclipse jdt internal junit runner RemoteTestRunner init RemoteTestRunner java 222      at org eclipse jdt internal junit runner RemoteTestRunner main RemoteTestRunner java 206  Caused by  java lang ClassNotFoundException  org junit platform launcher core LauncherFactory     at java base jdk internal loader BuiltinClassLoader loadClass Unknown Source      at java base jdk internal loader ClassLoaders AppClassLoader loadClass Unknown Source      at java base java lang ClassLoader loadClass Unknown Source          11 more   What I tried so far  I ve already tried   to remove the test folder from build path and add it again  to start the test with hovering over the method annotated with  Test and then click  Run as JUnit Test    remove JUnit from Buildpath and add it again restart eclipse I ve also moved the project whole project from one machine to another machine and tried it with the provided eclipse installation there to rename the test method  to retype the  Test annotation   Some of these steps can be found here  but in the end the problem remained

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Just added my Test class via eclipse menu and worked  Right click to project -  New -  Other -  JUnit -  JUnit Test Case

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In my case  the problem was myself and no IDE like Eclipse  I ve imported the JUnit 4 Test class   So do NOT import this one    import org junit Test     JUnit 4   But DO import that one   import org junit jupiter api Test    JUnit 5

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I got the same problem in a SpringBoot project and  in my case  the cause was that the ouput folder   target test-classes  was empty  Fixed it manually in the  classpath file  looking for the classpathentry with the attribute  quot test quot  and changing the content of the output attribute  From this   lt classpathentry kind  quot src quot  output  quot  lt project folder gt  target test-classes quot  path  quot src test java quot  gt       lt attributes gt           lt attribute name  quot test quot  value  quot true quot   gt           lt attribute name  quot optional quot  value  quot true quot   gt           lt attribute name  quot maven pomderived quot  value  quot true quot   gt       lt  attributes gt   lt  classpathentry gt   to this   lt classpathentry kind  quot src quot  output  quot target test-classes quot  path  quot src test java quot  gt       lt attributes gt           lt attribute name  quot test quot  value  quot true quot   gt           lt attribute name  quot optional quot  value  quot true quot   gt           lt attribute name  quot maven pomderived quot  value  quot true quot   gt       lt  attributes gt   lt  classpathentry gt

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Same error i faced in eclipse version Oxygen 3a Release  4 7 3a    There is issue in Maven Dependencies mismatch To solve i have updated my Pom xml with following dependecies   http   maven apache org xsd maven-4 0 0 xsd       4 0 0     com netapp junitnmactiopractice     JunitAndMactioPractice     0 0 1-SNAPSHOT   lt properties gt       lt project build sourceEncoding gt UTF-8 lt  project build sourceEncoding gt       lt java version gt 1 8 lt  java version gt       lt junit jupiter version gt 5 1 1 lt  junit jupiter version gt       lt junit platform version gt 1 1 1 lt  junit platform version gt   lt  properties gt    lt build gt       lt plugins gt           lt plugin gt               lt artifactId gt maven-compiler-plugin lt  artifactId gt               lt version gt 3 1 lt  version gt               lt configuration gt                   lt source gt   java version  lt  source gt                   lt target gt   java version  lt  target gt               lt  configuration gt           lt  plugin gt       lt  plugins gt   lt  build gt    lt dependencies gt       lt dependency gt           lt groupId gt org junit jupiter lt  groupId gt           lt artifactId gt junit-jupiter-engine lt  artifactId gt           lt version gt   junit jupiter version  lt  version gt       lt  dependency gt       lt dependency gt           lt groupId gt org junit platform lt  groupId gt           lt artifactId gt junit-platform-runner lt  artifactId gt           lt version gt   junit platform version  lt  version gt           lt scope gt test lt  scope gt       lt  dependency gt   lt  dependencies gt

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Answers so far did not adress the problem of sharing code with other people who don t necessarily use Eclipse  Here is one proposition  The key is to use a maven profile to solve the Eclipse Case   It assumes you have defined a property junit5 version in your pom like    lt properties gt       lt project build sourceEncoding gt UTF-8 lt  project build sourceEncoding gt       lt junit5 version gt 5 1 1 lt  junit5 version gt   lt  properties gt    then in the profiles section add the following    lt profiles gt       lt profile gt           lt id gt eclipse lt  id gt           lt dependencies gt               lt dependency gt                   lt groupId gt org junit jupiter lt  groupId gt                   lt artifactId gt junit-jupiter-engine lt  artifactId gt               lt  dependency gt               lt dependency gt                   lt groupId gt org junit platform lt  groupId gt                   lt artifactId gt junit-platform-launcher lt  artifactId gt               lt  dependency gt           lt  dependencies gt           lt dependencyManagement gt               lt dependencies gt                   lt dependency gt                       lt groupId gt org junit jupiter lt  groupId gt                       lt artifactId gt junit-jupiter-engine lt  artifactId gt                       lt version gt   junit5 version  lt  version gt                       lt scope gt test lt  scope gt                   lt  dependency gt                   lt dependency gt                       lt groupId gt org junit platform lt  groupId gt                       lt artifactId gt junit-platform-launcher lt  artifactId gt                       lt version gt 1 1 1 lt  version gt                       lt scope gt test lt  scope gt                   lt  dependency gt               lt  dependencies gt           lt  dependencyManagement gt       lt  profile gt   lt  profiles gt    All you have to do after this is to select the profile in your local Eclipse  Right click on your project and select Maven  gt  Select Maven Profiles     or hit Ctrl   Alt   P   and then check the  eclipse  profile we just created     With that you are done  Your Eclipse will run Junit 5 tests as expected  but the configuration you added won t pollute other builds or other IDE

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For me  I configured the build path to add JUnit 5 Library and also by adding the dependency         lt dependency gt            lt groupId gt org junit platform lt  groupId gt            lt artifactId gt junit-platform-launcher lt  artifactId gt            lt version gt 1 1 0 lt  version gt            lt scope gt test lt  scope gt         lt  dependency gt    seperately

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I m using   Spring Tool Suite 4  Version  4 4 2 RELEASE Build Id  201911201053 Java version  1 8 0 191  and the message displayed is  No tests found with test runner  JUnit5   what worked for me was the configuration below           lt properties gt           lt java version gt 1 8 lt  java version gt           lt junit-jupiter version gt 5 5 2 lt  junit-jupiter version gt           lt junit-platform version gt 1 5 2 lt  junit-platform version gt       lt  properties gt         lt dependency gt           lt groupId gt org junit jupiter lt  groupId gt           lt artifactId gt junit-jupiter-engine lt  artifactId gt           lt version gt   junit-jupiter version  lt  version gt           lt scope gt test lt  scope gt       lt  dependency gt       lt dependency gt           lt groupId gt org junit platform lt  groupId gt           lt artifactId gt junit-platform-launcher lt  artifactId gt           lt version gt   junit-platform version  lt  version gt           lt scope gt test lt  scope gt       lt  dependency gt

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I had a similar issue  It was due to an incorrect source path in properties  Open project properties - gt  Java Build Path - gt  Sources  And remove the incorrect path if it is your case

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When I change my jupiter api version into latest one  it was solved  Meanwhile  my eclipse and other eclipse extensions ide s  such as STS  is getting build path error  For every maven update  ide forces me to set the JRE System Library

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Adding this maven dependency with JUnit Jupiter  v 5 5 1  solves the issue    lt dependency gt       lt groupId gt org junit platform lt  groupId gt       lt artifactId gt junit-platform-launcher lt  artifactId gt       lt version gt 1 5 1 lt  version gt       lt scope gt test lt  scope gt   lt  dependency gt

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From the start the error message tell you that class is not found    NoClassDefFoundError that mean the PATH to junit is the problem    Press right click to project folder and choose Properties OR select project folder and press combination cmd   i   select from list  Java Build Path   select  Libraries  tab If JUnit 5 or JUnit 4  is added to  Modulepath   select the  JUnit 5  and press Remove  select  Classpath   press  Add Library      from opened  Add Library  window  select JUnit  press next  Select JUnit library version that you need and press Finish    That is all  Try to run test again

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Try to reconfigure your unit test configurations to be the project JRE

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None of the solutions helped   The problem is that Eclipse 2018-12 has support for JUnit 5 3 1  If you start it with a version before that  it will fail   So make sure you use at least 5 3 1   5 4 0 does work too   In case your parent pom is Spring Boot  you need to make sure  in dependency management  that junit-jupiter-api is set to the same version  You don t need junit-platform-runner or -launcher

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I faced this issue with Eclipse  Version  2019-12  4 14 0   too  The solution seems either to use IntelliJ or to use the Maven test to run such tests in Eclipse

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you should change   Test public static void testmethod       to    Test public void testmethod       the  Test is unsupport static method

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replace  import org junit Test   with  import org junit jupiter api Test

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Removing the JUnit library  and then adding it again fixed this issue for me

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I fixed the issue by right clicking the test and selecting  Run Configurations  and changing the  Test runner   selection to  JUnit 4  as shown here     I ran the test again and it worked

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FYI  another cause of  No tests found using junit5  is  inadvertently or intentionally  declaring the test cases  private       Example of test case that doesn t get included  Test private void testSomeMethod         They need to be public

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Test annotation must be imported from org junit jupiter api Test so the Junit5 can read it  Junit4 use  Test annotations imported from org junit Test package

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SIMPLE FIX   Add JUnit 5 Library   INSTRUCTIONS    Right click on project -  Build Path -  Configure Build Path In the pop-up -  Add Library -  JUnit -  JUnit 5 -  Finish -  Apply You should see the JUnit 5 Library  and its jars  added to your project Right click on project -  Maven -  Update Project -  OK

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As everyone informed it s IDE bug  I tried in Eclipse and STS  In both the cases  it is failing   As a workaround  I have fixed by modifying the pom xml file like below   I have added these two maven dependencies junit-jupiter-engine and junit-platform-launcher   pom xml   lt  -- https   mvnrepository com artifact org junit jupiter junit-jupiter-engine -- gt       lt dependency gt           lt groupId gt org junit jupiter lt  groupId gt           lt artifactId gt junit-jupiter-engine lt  artifactId gt           lt version gt   junit-jupiter version  lt  version gt           lt scope gt test lt  scope gt       lt  dependency gt        lt  -- https   mvnrepository com artifact org junit platform junit-platform launcher -- gt       lt dependency gt           lt groupId gt org junit platform lt  groupId gt           lt artifactId gt junit-platform-launcher lt  artifactId gt           lt version gt   junit-platform version  lt  version gt           lt scope gt test lt  scope gt       lt  dependency gt   lt  dependencies gt    Also please make sure to add the version of both the maven dependencies in the properties tag    lt properties gt       lt java version gt 1 8 lt  java version gt       lt junit-jupiter version gt 5 2 0 lt  junit-jupiter version gt       lt junit-platform version gt 1 2 0 lt  junit-platform version gt   lt  properties gt

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I copied some code and created a TC  Basically converted a normal java class to JUnit TC   I was gettgig error  Later I created a new JUnit Class from New -  Junit TC  Copied the same code  It works fine and error vanished

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I am using eclipse 2019-09   I had to update the junit-bom version to at least 5 4 0  I previously had 5 3 1 and that caused the same symptoms of the OP   My config is now        lt dependencyManagement gt           lt dependencies gt               lt dependency gt                   lt groupId gt org junit lt  groupId gt                   lt artifactId gt junit-bom lt  artifactId gt                   lt version gt 5 5 2 lt  version gt                   lt type gt pom lt  type gt                   lt scope gt import lt  scope gt               lt  dependency gt           lt  dependencies gt       lt  dependencyManagement gt

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Following Andrii Karaivanskyi s answer here s the Maven POM declaration    lt properties gt               lt junit-jupiter version gt 5 2 0 lt  junit-jupiter version gt       lt junit-platform version gt 1 2 0 lt  junit-platform version gt           lt  properties gt    lt dependencies gt               lt dependency gt           lt groupId gt org junit jupiter lt  groupId gt           lt artifactId gt junit-jupiter-engine lt  artifactId gt           lt version gt   junit-jupiter version  lt  version gt           lt scope gt test lt  scope gt       lt  dependency gt       lt dependency gt           lt groupId gt org junit platform lt  groupId gt           lt artifactId gt junit-platform-launcher lt  artifactId gt           lt version gt   junit-platform version  lt  version gt           lt scope gt test lt  scope gt       lt  dependency gt           lt  dependencies gt    UPDATE  As per comment by Alexander Wessel you can use org junit junit-bom as described in his answer to question Eclipse No tests found using JUnit 5 caused by NoClassDefFoundError for LauncherFactory

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You are missing JUnit 5 platform launcher with group   org junit platform   name   junit-platform-launcher   Just add in ur POM    lt dependency gt          lt groupId gt org junit platform lt  groupId gt          lt artifactId gt junit-platform-launcher lt  artifactId gt       lt  dependency gt

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You can use only junit-jupiter as a test dependency instead of junit-jupiter-api  junit-platform-launcher  junit-jupiter-engine    lt dependency gt       lt groupId gt org junit jupiter lt  groupId gt       lt artifactId gt junit-jupiter lt  artifactId gt       lt version gt 5 5 2 lt  version gt       lt scope gt test lt  scope gt   lt  dependency gt

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Converting the Java project to Maven Project fixed the issue for me  The conversion was done on Eclipse by  Right Click Project - gt  Configure - gt  Convert to Maven Project

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adding org junit platform to your pom and build it  Next  you need to go to  quot Run Configuration quot  of your TEST FILE and add JUNIT in the classpath  APPLY- gt RUN will resolve the issue

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I ran into the same error  and in my case it was a simple matter of going to Project Properties  gt  Maven  gt  Update project and or cleaning and rebuilding the project

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I also faced the same issue you just need to add the library   Junit Library is already provided along with Eclipse so you just need to follow below   Build Path   Configure Build Path   library   Add library   JUnit   Next   finish  It works for me

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I used actually spring-tool-suite-4-4 5 1 and I had this bug when I want run a test class  and the solution was to add to  java build path    junit5  in Libraries

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You should make sure your test case  function is public rather than private to make it accessible by Test Runner   Test private void testmethod      to  Test public void testmethod

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You might be importing  Test from org junit Test  which is a JUnit 4 annotation  The Junit5 test runner will not discover it  The Junit5 test runner will discover a test annotated with org junit jupiter api Test Found the answer from Import org junit Test throws error as  quot No Test found with Test Runner  quot JUnit 5 quot  quot

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Since it s not possible to post code blocks into comments here s the POM template I am using in projects requiring JUnit 5  This allows to build and  Run as JUnit Test  in Eclipse and building the project with plain Maven     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       lt modelVersion gt 4 0 0 lt  modelVersion gt        lt groupId gt group lt  groupId gt       lt artifactId gt project lt  artifactId gt       lt version gt 0 0 1-SNAPSHOT lt  version gt       lt name gt project name lt  name gt        lt dependencyManagement gt         lt dependencies gt           lt dependency gt           lt groupId gt org junit lt  groupId gt           lt artifactId gt junit-bom lt  artifactId gt           lt version gt 5 3 1 lt  version gt           lt type gt pom lt  type gt           lt scope gt import lt  scope gt           lt  dependency gt         lt  dependencies gt       lt  dependencyManagement gt        lt dependencies gt         lt dependency gt           lt groupId gt org junit jupiter lt  groupId gt           lt artifactId gt junit-jupiter-engine lt  artifactId gt           lt scope gt test lt  scope gt         lt  dependency gt          lt dependency gt           lt groupId gt org junit platform lt  groupId gt           lt artifactId gt junit-platform-launcher lt  artifactId gt           lt scope gt test lt  scope gt         lt  dependency gt          lt dependency gt           lt  -- only required when using parameterized tests -- gt           lt groupId gt org junit jupiter lt  groupId gt           lt artifactId gt junit-jupiter-params lt  artifactId gt           lt scope gt test lt  scope gt         lt  dependency gt       lt  dependencies gt   lt  project gt    You can see that now you only have to update the version in one place if you want to update JUnit  Also the platform version number does not need to appear  in a compatible version  anywhere in your POM  it s automatically managed via the junit-bom import

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you should know that     Before from junit4 goes with  Test    import org junit Test   AND    BeforeEach from Junit5 goes with    import org junit jupiter api Test   so make sure you are using the imports from the same version of Junit   otherwise it w ont Work I guess

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I got the same problem after creating a new TestCase  Eclipse -  New -  JUnit Test Case  It creates a class without access level modifier  I could solve the problem by just putting a public before the class keyword

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This issue happening while implementing Mockito with spring boot api  Below add below dependency in in gradle file  compile group   org mockito   name   mockito-core   version   2 22 0    Note  Spring boot version 2 2 0

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Using STS 3 9 1 I got the same problem  However  currently I do not require any new JUnit5 features  so I tried to force using an older version  If using maven  you can add following dependencies to your pom xml    lt dependency gt       lt groupId gt org junit platform lt  groupId gt       lt artifactId gt junit-platform-launcher lt  artifactId gt       lt version gt   junit platform version  lt  version gt       lt scope gt test lt  scope gt   lt  dependency gt    lt dependency gt       lt groupId gt org junit jupiter lt  groupId gt       lt artifactId gt junit-jupiter-engine lt  artifactId gt       lt version gt   junit jupiter version  lt  version gt       lt scope gt test lt  scope gt   lt  dependency gt    lt dependency gt       lt groupId gt org junit vintage lt  groupId gt       lt artifactId gt junit-vintage-engine lt  artifactId gt       lt version gt   junit vintage version  lt  version gt       lt scope gt test lt  scope gt   lt  dependency gt    This did the trick for me  at least as long as I do not need JUnit5 explicitly

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Add in your POM    lt dependencyManagement gt       lt dependencies gt           lt dependency gt               lt groupId gt org junit lt  groupId gt               lt artifactId gt junit-bom lt  artifactId gt               lt version gt 5 3 1 lt  version gt               lt type gt pom lt  type gt               lt scope gt import lt  scope gt           lt  dependency gt       lt  dependencies gt   lt  dependencyManagement gt

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You ran into Eclipse bug 525948 which has already been fixed and which will be published in the upcoming release Oxygen 3  4 7 3   March 21  2018   As workaround  put your test code in a separate project and add the project under test to the modulepath  but do not add a module-info java to your test project  With your project  class and module naming  it should look something like this     See also my video that shows Java 9 and JUnit 5 in Eclipse Oxygen 1a in action

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It may cause by the version of junit-platform-launcher   junit-platform-runner   1 1 0 does not work  1 4 1 works in my setup   I think this is a bug in eclipse as it is working with higher version libraries of junit and not other version   This resolved my issue  The other resolution looked less feasible or risky to me  Thanks

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I have the same issue with STS 3 9 1  It seems like an Eclipse bug  however  to fix this you can add a test dependency junit-platform-launcher to your project   https   mvnrepository com artifact org junit platform junit-platform-launcher   This is how I did for my project which uses gradle   dependencies          other stuff here      testCompile group   org junit jupiter   name   junit-jupiter-engine   version   5   junit5MinorVersion       testCompile group   org junit platform   name   junit-platform-launcher   version   1   junit5MinorVersion       gradle properties file   junit5MinorVersion 1 0   I believe the same applies if you see this exception while using IntelliJ IDEA

[java] Eclipse No tests found using JUnit 5 caused by NoClassDefFoundError for LauncherFactory

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