Class Not Found Exception when running JUnit test

Question

I am getting this error when running JUnit test in Eclipse   Class not found com myproject server MyTest java lang ClassNotFoundException  com myproject server MyTest     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 423      at sun misc Launcher AppClassLoader loadClass Launcher java 308      at java lang ClassLoader loadClass ClassLoader java 356      at org eclipse jdt internal junit runner RemoteTestRunner loadClass RemoteTestRunner java 693      at org eclipse jdt internal junit runner RemoteTestRunner loadClasses RemoteTestRunner java 429      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    I ve tried adding JUnit library in the classpath although I m using maven  and the JUnit library is in the POM dependency    I already have tried cleaning the project and created a new JUnit test case using the JUnit plugin for Eclipse  still getting the same error

User · Answer

In my case  changing the order of Maven Dependencies from Build Path configuration did not work for me  I changed its order from Run configuration  Follow these steps      Go to Run - gt  Run Configurations        Click on the unit test s run configuration and click on the Classpath tab      check Use temporary JAR to specify classpath  to avoid classpath length limitations   May be it is enough and your test works  You should try  so press Run button  If it did not work  Follow all previous steps again and without pressing Run button  go to the next step      In sub branches of User Entries move Maven Dependencies above your project or test class      Click Run button

User · Answer

In my case I had a wrong maven directory structure   Which should be like    src test java  com myproject server MyTest  After I fixed that - everything worked like a charm

User · Answer

Making some dummy change and saving the test class can solve the problem  It will build the  class automatically

User · Answer

Pls check if you have added junit4 as dependency   e g   lt dependency gt       lt groupId gt junit lt  groupId gt       lt artifactId gt junit lt  artifactId gt       lt version gt 4 11 lt  version gt       lt scope gt test lt  scope gt   lt  dependency gt

User · Answer

NoClassDefFoundError really means it can t initilize the class  It has nothing to do with finding the class  I got this error when calling trim   on a null String   JUnit won t show NullPointerException  The string isn t null when running normally because  I m fetching the string from a properties file which is not availible for tests    My advice is to remove pieces from the class until your tests start passing  Then you can determine which line is giving the error

User · Answer

I had a similar problem with my tests and found somewhere in the Web  that you have to go to Build Path in your project s properties and move Maven Dependencies above JRE System Library  That seems to have worked for me

User · Answer

Earlier  in this case  I always did mvn eclipse eclipse and restarted my Eclipse and it worked  After migrating to GIT  it stopped working for me which is somewhat weird   Basic problem here is Mr Eclipse does not find the compiled class   Then  I set the output folder as Project target test-classes which is by default generated by mvn clean install without skipping the test and proceeded with following workaround   Option 1  Set classpath for each test case  Eclipse - Run - Run Configurations - under JUnit- select mytest -  under classpath tab- Select User Entries- Advanced- Add Folder -  Select - Apply- Run  Option 2  Create classpath variable and include it in classpath for all the test cases  Eclipse - Windows - Classpath Variables - New-  Name   Junit test cases cp   path    - ok Then go to Eclipse- Run - Run Configurations - JUnit- select mytest - under classpath tab - Select User Entries- Advanced- Add classpath variables- Select Junit test cases cp- ok- Apply- Run  This is the only thing currently working for me after trying all the suggestions online

User · Answer

Might be you forgotten to place the Main class and Test Case class in   src test java  Check it Once

User · Answer

Check if your project is opened as a Maven project and not just a regular Java project  Actually a no-brainer  but that is exactly the same reason why you might miss it

User · Answer

This appears to occur because only the source code is compiling when you use mvn clean compile  I m using maven 3 1 0 so I m not sure if it always behaved like this     If you run mvn test  the test code will compile as well  but then it runs the tests  which may not be immediately desirable if you re trying to run them through Eclipse   The way around this is to add test-compile to your Maven command sequence whenever you do a mvn clean  For example  you would run mvn clean compile test-compile

User · Answer

After having tried everything here with no improvement  I solved my issue by just restarting Eclipse

User · Answer

I faced the same problem and I was able to fix it using  slomek s answer but the issue resurfaced after that    I finally fixed it by adding my project s output folder to the JUnit test s run configuration  Steps are    Find your project s output folder from Project properties - gt  Java Build Path - gt  Default output folder   Usually this is  lt project-folder gt  bin  Go to Run - gt  Run Configurations    Click on the unit test s run configuration and click on the Classpath tab Explicitly add your project s output folder under User Entries - even if the project is already included there   Click on Advanced - gt  Add folder to add the output folder    This issue might be due to weird project setup in Eclipse - e g  source folder with nested maven projects imported as a single project folder  at least that was how my project was setup

User · Answer

I had faced the same issue  I solved it by removing the external JUnit jar dependency which I added by download from the internet externally  But then I went to project- properties- build path- add library- junit- choosed the version ex junit4 - apply   It automatically added the dependency  it solved my issue

User · Answer

For me I had to put the project x src test java  at the bottom of the  quot order and export quot  in the  quot java build path quot

User · Answer

These steps worked for me    Delete the content of local Maven repository  run mvn clean install in the command line   cd to the pom directory   Build Project in Eclipse

User · Answer

In my case  only next steps helped me to resolve this issue    Project- properties- Run Debug Settings   In  Launch configurations for          select classes projects  Edit -  Classpath -   Restore Default Entries

User · Answer

I had the same problem with a Gradle project with a test SourceSet with two resource directories    This snippet comes from a main-module gradle and adds a resource dir to the test SourceSet   sourceSets       test           resources               srcDir     other-module src test resources                       Doing this I had two resource directories related to the test SourceSet of the project main-module      other-module src test resources src test resources  relative to the main-module folder  automatically added by the java plugin   I find out that if I had two files with the same name in both the source directories  something in the process resources stage went wrong  As result  no compilation started and for this reason no  class were copied in the bin directory  where JUnit was looking for the classes  The ClassNotFoundException disappeared just renaming one of the two files

User · Answer

It seems compile issue  Run project as Maven test  then Run as JUnit Test

User · Answer

It s worth mentioning as another answer that if you re using eGit  and your classpath gets updated because of say  a test coverage tool like Clover  that sometimes there s a cleanup hiccup that does not completely delete the contents of  path to git repository  lt project name gt  bin   Essentially  I used Eclipse s Error Log View  identified what was causing issues during this cleanup effort  navigated to the source directory  and manually deleted the  lt project name gt  bin directory  Once that finished I went back to Eclipse and refreshed  F5  my project and the error went away

User · Answer

1- mvn eclipse eclipse  2- project clean all projects  3- restart

User · Answer

I fixed my issue by running maven update  Right click project your project   Maven   Update Project

User · Answer

It can also be due to   ERROR  No compiler is provided in this environment  Perhaps you are running on a JRE rather than a JDK

User · Answer

For project that does not use maven   This worked for me https   ihategeek wordpress com 2012 04 18 eclipse-junit-test-class-not-found   Adding the jre and project src at the bottom in Order and exports in build path

User · Answer

If this problem occurs in Eclipse only  executing command Project -  Clean    on selected project may help

User · Answer

I had the similar problem with my Eclipse Helios which debugging Junits  My problem was little different as i was able to run Junits successfully but when i was getting ClassNotFoundException while debugging the same JUNITs   I have tried all sort of different solutions available in Stackoverflow com and forums elsewhere  but nothing seem to work  After banging my head with these issue for close to two days  finally i figured out the solution to it   If none of the solutions seem to work  just delete the  metadata folder created in your workspace  This would create an additional overhead of importing the projects and all sorts of configuration you have done  but these will surely solve these issue   Hope these helps

[java] Class Not Found Exception when running JUnit test

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