java lang NoClassDefFoundError in junit

Question

I am getting this error in java in my junit test code  I looked up on the net and it says that I need to add the junit jar in the classpath   In Eclipse I have added it in the classpath of Project Properties windows but I still get initialisation error  What should I do     This is the complete trace of the error   java lang NoClassDefFoundError  org hamcrest SelfDescribing     at java lang ClassLoader defineClass1 Native Method      at java lang ClassLoader defineClassCond Unknown Source      at java lang ClassLoader defineClass Unknown Source      at java security SecureClassLoader defineClass Unknown Source      at java net URLClassLoader defineClass Unknown Source      at java net URLClassLoader access 000 Unknown Source      at java net URLClassLoader 1 run Unknown Source      at java security AccessController doPrivileged Native Method      at java net URLClassLoader findClass Unknown Source      at java lang ClassLoader loadClass Unknown Source      at sun misc Launcher AppClassLoader loadClass Unknown Source      at java lang ClassLoader loadClass Unknown Source      at org junit internal builders JUnit4Builder runnerForClass JUnit4Builder java 13      at org junit runners model RunnerBuilder safeRunnerForClass RunnerBuilder java 57      at org junit internal builders AllDefaultPossibilitiesBuilder runnerForClass AllDefaultPossibilitiesBuilder java 29      at org junit runners model RunnerBuilder safeRunnerForClass RunnerBuilder java 57      at org junit internal requests ClassRequest getRunner ClassRequest java 24      at org eclipse jdt internal junit4 runner JUnit4TestReference  lt init gt  JUnit4TestReference java 32      at org eclipse jdt internal junit4 runner JUnit4TestClassReference  lt init gt  JUnit4TestClassReference java 25      at org eclipse jdt internal junit4 runner JUnit4TestLoader createTest JUnit4TestLoader java 41      at org eclipse jdt internal junit4 runner JUnit4TestLoader loadTests JUnit4TestLoader java 31      at org eclipse jdt internal junit runner RemoteTestRunner runTests RemoteTestRunner java 452      at org eclipse jdt internal junit runner RemoteTestRunner runTests RemoteTestRunner java 683      at org eclipse jdt internal junit runner RemoteTestRunner run RemoteTestRunner java 390      at org eclipse jdt internal junit runner RemoteTestRunner main RemoteTestRunner java 197  Caused by  java lang ClassNotFoundException  org hamcrest SelfDescribing     at java net URLClassLoader 1 run Unknown Source      at java security AccessController doPrivileged Native Method      at java net URLClassLoader findClass Unknown Source      at java lang ClassLoader loadClass Unknown Source      at sun misc Launcher AppClassLoader loadClass Unknown Source      at java lang ClassLoader loadClass Unknown Source          25 more

User · Answer

These steps worked for me when the error showed that the Filter class was missing (as reported in this false-diplicated question: JUnit: NoClassDefFoundError: org/junit/runner/manipulation/Filter ):

Make sure to have JUnit 4 referenced only once in your project (I also removed the Maven nature, but I am not sure if this step has any influence in solving the problem).
Right click the file containing unit tests, select Properties, and under the Run/Debug settings, remove any entries from the Launch Configurations for that file. Hit Apply and close.
Right click the project containing unit tests, select Properties, and under the Run/Debug settings, remove any entries involving JUnit from the Launch Configurations. Hit Apply and close.
Clean the project, and run the test.

Thanks to these answers for giving me the hint for this solution: https://stackoverflow.com/a/34067333/5538923 and https://stackoverflow.com/a/39987979/5538923).

User · Answer

In my case  I added my libraries to Modulepath instead on Classpath   It only works if JUnit is correctly added to Classpath

User · Answer

I had the same issue  the problem was in the  ContextConfiguration in me test classes  i was loading the servlet context too i just change    ContextConfiguration locations      classpath      -context xml    classpath      -config xml       to    ContextConfiguration locations      classpath     -context xml    classpath     -config xml       and that  s it  this way im only loading all the files with the pattern  -context xml in me test path

User · Answer

Right click your project in Package Explorer   click Properties go to Java Build Path   Libraries tab click on  Add Library  button select JUnit click Next  select in dropdown button JUnit4 or other new versions  click finish  Then Ok

User · Answer

Try below steps    Go to your project s run configuration  In Classpath tab add JUnit library  Retry the same steps    It worked for me

User · Answer

Make sure Environment variable JUNIT HOME is set to c  JUNIT  then In run configuration   select classpath   add external jars junit-4 11 jar

User · Answer

On Eclipse I was able to solve the above issue by following the below steps    Right-click on the test file which you want to run  Select Run As -  Run Configurations -  Select Classpath tab -  Select to the bootstrap Entries -  Select Advanced -  Select Add library -  Select JUnit -  Next - Select JUnit4 from the drop-down -  Finish   Then Select Apply -  Run

User · Answer

The reason for this is  hamcrest-core  jar is not in classpath as it doesn t comes directly with junit jar  So there are two ways to resolve this    select project -  buildpath -  add libraries and select junit  It contains both junit  amp  hamcrest-core  download hamcrest-core from maven repo and add this to your classpath

User · Answer

This error also comes if 2 versions of hamcrest-library or hamcrest-core is present in the classpath   In the pom file  you can exclude the extra version and it works

User · Answer

Adding my two cents to other answers    Check if you haven t by any chance created your test class under src main java instead of usual src test java  The former is the default in Eclipse when you create a new test class for whatever reason and can be overlooked  It can be as simple as that

User · Answer

If you have more than one version of java  it may interfere with your program   I suggest you download JCreator    When you do  click configure  options  and JDK Profiles  Delete the old versions of Java from the list  Then click the play button  Your program should appear    If it doesn t  press ctrl alt O and then press the play button again

User · Answer

The org hamcrest SelfDescribing class is not on the run-time classpath

User · Answer

The same problem can occur if you have downloaded JUnit jar from the JUnit website  but forgotten to download the Hamcrest jar - both are required  the instructions say to download both  but I skipped ahead  Oops

User · Answer

Eclipse - gt  Top menu - gt  Run - gt  Run Configurations Delete all the occurrences of your test  Your test may appear as YourTest Method 1    Delete that as well  Re-run  Let Eclipse build a fresh configuration   Addendum  Locally I have created a  quot User Library quot  and added to my projects which has  hamcrest-core-1 3 jar junit-4 12 jar

User · Answer

When using in Maven  update artifact junit junit from e g  4 8 2 to 4 11

User · Answer

even Junit4 11 jar doesnot have the hamcrest-core jar  I added explicitly in the classpath and the issue was resolved

User · Answer

I was following this video  https   www youtube com watch v WHPPQGOyy Y but failed to run the test  After that  I deleted all the downloaded files and add the Junit using the step in the picture

[java] java.lang.NoClassDefFoundError in junit

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