Eclipse JUnit - possible causes of seeing initializationError in Eclipse window

Question

I know this question is pretty general but I haven t found any hints on why this error may show up  What are possible causes of seeing initalizationError in Eclipse window  I get no useful information just a long and useless failure trace  not included here     I am using JUnit 4 11  I have written the following code - just to see if it works   package test   import static org junit Assert     import org junit AfterClass  import org junit BeforeClass  import org junit Test   public class SimpleTest     BeforeClass public static void setUpBeforeClass   throws Exception       AfterClass public static void tearDownAfterClass   throws Exception       Test public void test         assertEquals 15  15          Edit  Sorry In Eclipse window it s called actually a  Failure trace    java lang NoClassDefFoundError  org hamcrest SelfDescribing     at java lang ClassLoader defineClass1 Native Method    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 100 Unknown Source   at java net URLClassLoader 1 run 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 10      at org junit runners model RunnerBuilder safeRunnerForClass RunnerBuilder java 59      at  org junit internal builders AllDefaultPossibilitiesBuilder runnerForClass AllDefaultPossibilitiesBuilder java 26      at org junit runners model RunnerBuilder safeRunnerForClass RunnerBuilder java 59      at org junit internal requests ClassRequest getRunner ClassRequest java 26      at org eclipse jdt internal junit4 runner JUnit4TestReference  lt init gt  JUnit4TestReference java 33      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 48      at org eclipse jdt internal junit4 runner JUnit4TestLoader loadTests JUnit4TestLoader java 38      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 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

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Just try  Project   Clean     - seems to be THE solution to many problems in Eclipse

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I received this error when the class was annotated with  Ignore and I tried to run a specific test via right clicking on it   Removing the  Ignore fixed the problem

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My mistake was that I missed out  Test annotation on the test method

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I had the same issue    I was using maven building tool with JUnit dependency scope as  test  and my  Test method was in main module   To resolve  I ve  1  Commented the scope tag of JUnit dependency in the pom xml 2  Rebuilt the package 3  Made sure the Test class has only one constructor  The issue can be two-folded  1  The JUnit dependency is limited to test scope and the  Test method is in main scope 2  The test class has more than one constructor

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For me it was something to do with commons-logging  Since I was using   RunWith SpringJUnit4ClassRunner class    This resolved my issue   lt dependency gt       lt groupId gt commons-logging lt  groupId gt       lt artifactId gt commons-logging lt  artifactId gt       lt version gt 1 2 lt  version gt   lt  dependency gt

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For me it was a silly mistake  I inadvertently set the test as private instead of public    Test private void thisTestWasCausingProblems             it should have been   Test public void thisTestIsOK

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You ve probably got one of two problems   1  You re using JUnit 4 11  which doesn t include hamcrest  Add the hamcrest 1 3 library to your classpath   2  You ve got hamcrest 1 3 on your classpath  but you ve got another version of either junit or hamcrest on your classpath   For background  junit pre 4 11 included a cut down version of hamcrest 1 1  4 11 removed these classes

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Just if this helps  I was using Junit5 but the  RunWith SpringRunner class  was pointing towards import org springframework test context junit4 SpringRunner  which was messing around with things and hence was giving the initialization error  I fixed this and it worked

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I had naively added junit-4 12 jar from poi apache org to my Build Path in Eclipse  I deleted it  Project  Properties  Java Build Path  Libraries  junit-4 12 jar  Remove  then in my test class allowed Eclipse to  Fix Project Setup  after pressing Ctrl-1  No more problems   -

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For me  I mistakenly added a parameter to the test method which caused initialization error

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I ve experimented the exact same error  My problem was that the SetUp method I had created was declared as static    If using eclipse  one could get a good description by clicking above the error and then checking the Failure trace window  just below    That s how I found the real problem

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If you re using the xtend language  or some other JVM lang with type inference  and haven t explicitly defined the return type then it may be set to a non-void type because of the last expression  which will make JUnit fail

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In my case I have changed project name in pom xml so the new target directory was generated and junit was searching classes in old directory  You need to change directory for JUnit also in Eclipse   Properties - gt  Java Build Path - gt  Source  Default output folder   And also check because some of source folders listed in the same window may have former directory name  You need to change them too

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I had the same problem  Once it was excel path issue and other time it was missing  Test annotation

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This problem also occurs if you have a private Rule in you class    Rule private TemporaryFolder folderRule    Make it public

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My problem was that my parent class had no  Test methodes  I used there only some utilities  When I declared it abstract it works

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I had the same problem  the solution for me is the following   I had only install the junit jar file from the web  but this library related with the hacrest-core jar When I downloaded the hacrest-core jar file and added it in my project everything works fine

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In my case  it was because I was not pointing to the correct package where I kept my feature  cucumber  file s   This was a case of wrong path specification  See code snippet below  import org junit runner RunWith   import io cucumber junit CucumberOptions  import io cucumber junit Cucumber    RunWith Cucumber class   CucumberOptions               features    quot src test features quot       glue    quot stepDefinitions quot                      Below is the screenshot of the JUnit error   Below is the Stack Trace in the console   The final solution was I had to change the path to the correct package where my feature files were kept  See the corrected code snippet below  package cucumberOptions   import org junit runner RunWith   import io cucumber junit CucumberOptions  import io cucumber junit Cucumber    RunWith Cucumber class   CucumberOptions               features    quot src test java features quot       glue    quot stepDefinitions quot                      public class TestRunner

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In my case  I had the following import in my test case   import org junit jupiter api Test   The correct import is   import org junit Test   Don t just import any old Test type from junit  make sure you pick the correct one

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I got another failure trace  but for future visitors using their favorite search engine   For me the problem was that eclipse somehow decided to execute only a single method in my test class  I couldn t figure out why  though   Especially if you did not change anything in your setup  check your run configuration

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For me the solution was one of the methods had to be void  I had it as Boolean

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I just had the same problem and the same message  I was able to get it fixed by importing to the Java Building Path the hamcrest-all-1 3 jar archive  I m using a JUnit 4 12 version

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For me  it was due to the  return type  of the test method  It should be  void

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For me it was a missing static keyword in one of the JUnit annotated methods  e g     AfterClass public static void cleanUp

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Junit 4 11 doesn t work with Spring Test framework  Also this link InitializationError When Use Spring   Junit explains how to debug junit initalizationError in eclipse

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Also make sure you have all  Before-   After- and whatever-JUnit-annotated methods declared as public  I had mine declared as private which caused the issue

[java] Eclipse JUnit - possible causes of seeing "initializationError" in Eclipse window

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