java lang Exception No runnable methods exception in running JUnits

Question

I am trying to run the JUnit on my Linux command prompt  opt junit  contains the necessary JARS hamcrest-core-1 3 jar and junit jar  and class files and I am using the following command to run the JUnit    java -cp hamcrest-core-1 3 jar junit jar   org junit runner JUnitCore  TestRunner   TestJunit class   import org junit Test  import static org junit Assert assertEquals  public class TestJunit       Test    public void testAdd           String str   Junit is working fine         assertEquals  Junit is working fine  str            TestRunner   import org junit runner JUnitCore  import org junit runner Result  import org junit runner notification Failure   public class TestRunner      public static void main String   args          Result result   JUnitCore runClasses TestJunit class         for  Failure failure   result getFailures               System out println  fail ho gaya  failure toString                   System out println  passed   result wasSuccessful                I am getting the following exception on running this  JUnit version 4 11  E Time  0 003 There was 1 failure  1  initializationError TestRunner  java lang Exception  No runnable methods     at org junit runners BlockJUnit4ClassRunner validateInstanceMethods BlockJUnit4ClassRunner java 169      at org junit runners BlockJUnit4ClassRunner collectInitializationErrors BlockJUnit4ClassRunner java 104      at org junit runners ParentRunner validate ParentRunner java 355      at org junit runners ParentRunner  lt init gt  ParentRunner java 76      at org junit runners BlockJUnit4ClassRunner  lt init gt  BlockJUnit4ClassRunner java 57      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 runner Computer getRunner Computer java 40      at org junit runner Computer 1 runnerForClass Computer java 31      at org junit runners model RunnerBuilder safeRunnerForClass RunnerBuilder java 59      at org junit runners model RunnerBuilder runners RunnerBuilder java 101      at org junit runners model RunnerBuilder runners RunnerBuilder java 87      at org junit runners Suite  lt init gt  Suite java 80      at org junit runner Computer getSuite Computer java 28      at org junit runner Request classes Request java 75      at org junit runner JUnitCore run JUnitCore java 117      at org junit runner JUnitCore runMain JUnitCore java 96      at org junit runner JUnitCore runMainAndExit JUnitCore java 47      at org junit runner JUnitCore main JUnitCore java 40   FAILURES    Tests run  1   Failures  1

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For me I added JUnit4 12 and Hamcrest1 3 on the classpath and changed import org testng annotations Test  or import org testng annotations    to import org junit Test   It finally works fine

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You can also get this if you mix org junit and org junit jupiter annotations inadvertently

User · Answer

in my case i just disabled     RunWith SpringRunner class   and there is no exception

User · Answer

In my case I had wrong package imported   import org testng annotations Test    instead of  import org junit Test    Beware of your ide autocomplete

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I also faced this issue and failed to figure out the reason for the same for sometimes   Later i found that auto import issue using IDE  That is imports of the program   Basically i was using eclipse IDE  And I was importing a wrong class  org junit jupiter api Test  into the program instead of required class  org junit Test   Hence check your imports before running any programs

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You will get this exception  if you use the JUnit 4 4 core runner to execute a class that has no   Test  method  Kindly consult the link for more info   courtesy vipin8169

User · Answer

In my case  I was using the wrong Test import  The correct one was import org junit Test

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the solution  is simple  if you importing   import org junit Test    you have to run as junit 4  right click - run as- Test config-  test runner-  as junit 4

User · Answer

I had similar issue error while running JunitCore along side with Junit Jupiter Junit5   JUnitCore runClasses classes   after removing  RunWith SpringRunner class  and ran with  SpringBootTest  FixMethodOrder MethodSorters NAME ASCENDING  i am able to resolve the issue for my tests as said in the above comments  https   stackoverflow com a 59563970 13542839

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If you re running test Suite via  RunWith Suite class   Suite SuiteClasses     check if all provided classes are really test classes       In my case one of the classes was an actual implementation  not a test class  Just a silly typo

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I got this error because I didn t create my own test suite correctly   Here is how I did it correctly   Put this in Foobar java   public class Foobar      public int getfifteen            return 15            Put this in FoobarTest java   import static org junit Assert    import junit framework JUnit4TestAdapter  import org junit Test  public class FoobarTest        Test     public void mytest             Foobar f   new Foobar             assert 15  f getfifteen               public static junit framework Test suite           return new JUnit4TestAdapter FoobarTest class             Download junit4-4 8 2 jar I used the one from here   http   www java2s com Code Jar j Downloadjunit4jar htm   Compile it   javac -cp     libs junit4-4 8 2 jar Foobar java FoobarTest java   Run it    el failbox  home el   java -cp     libs   org junit runner JUnitCore FoobarTest JUnit version 4 8 2   Time  0 009     OK  1 test    One test passed

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My controller test in big shortcut     RunWith SpringRunner class   SpringBootTest public class TaskControllerTest                 tests           I just removed  public  and magically it worked

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I had the same problem now with testing code  That was caused in spring boot because of the  RunWith annotation  I have used    RunWith SpringRunner class    With that annotation there is JUnit Vintage running which can t find any tests and gives you the error  I have removed that and only JUnit Jupiter is running and everything is fine

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if the class annotated with  RunWith SpringRunner class  But we class doesn t contain any test methods then we will face this issue  Solution  if we make to abstract we will not get this or if remove public then also we will not face this issue

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I was able to fix by manually adding the junit jar to my project classpath  The easiest way I found to do this was by adding a  lib directory in the project root  Then i just put the junit jar inside  lib and junit tests starting working for me

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This solution will apply to a very small percentage of people  typically people implementing their own JUnit test runners and using a separate ClassLoader    This can happen when you load a class from a different ClassLoader  then attempt to run that test from an instance of JUnitCore loaded from the system class loader  Example      Load class URLClassLoader cl   new URLClassLoader myTestUrls  null   Class lt   gt    testCls   cl loadClass  com gubby MyTest        Run test JUnitCore junit   new JUnitCore    junit run testCls      Throws java lang Exception  No runnable methods   Looking at the stack trace   java lang Exception  No runnable methods at org junit runners BlockJUnit4ClassRunner validateInstanceMethods BlockJUnit4ClassRunner java 169  at org junit runners BlockJUnit4ClassRunner collectInitializationErrors BlockJUnit4ClassRunner java 104  at org junit runners ParentRunner validate ParentRunner java 355  at org junit runners ParentRunner  lt init gt  ParentRunner java 76  at org junit runners BlockJUnit4ClassRunner  lt init gt  BlockJUnit4ClassRunner java 57  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 junit runner JUnitCore run JUnitCore java 138    The problem actually occurs at BlockJUnit4ClassRunner 169  assuming JUnit 4 11    https   github com junit-team junit blob r4 11 src main java org junit runners BlockJUnit4ClassRunner java L95  Where it checks which methods are annotated with  Test   protected List lt FrameworkMethod gt  computeTestMethods         return getTestClass   getAnnotatedMethods Test class       In this case  Test class will have been loaded with the system ClassLoader  i e   the one that loaded JUnitCore   therefore technically none of your test methods will have been annotated with that annotation   Solution is to load JUnitCore in the same ClassLoader as the tests themselves     Edit  In answer to the question from user3486675  you need to create a ClassLoader that doesn t delegate to the system class loader  e g    private static final class IsolatedURLClassLoader extends URLClassLoader       private IsolatedURLClassLoader URL   urls               Prevent delegation to the system class loader          super urls  null             Pass this a set of URLs that includes everything you need  You can create this by filtering the system classpath  Note that you cannot simply delegate to the parent ClassLoader  because those classes would then get loaded by that rather than the ClassLoader of your test classes   Then you need to kick off the whole JUnit job from a class loaded by this ClassLoader  It gets messy here  Something like this utter filth below   public static final class ClassLoaderIsolatedTestRunner        public ClassLoaderIsolatedTestRunner                Disallow construction at all from wrong ClassLoader         ensureLoadedInIsolatedClassLoader this                 Do not rename      public void run invokedReflectively List lt String gt  testClasses  throws BuildException              Make sure we are not accidentally working in the system CL         ensureLoadedInIsolatedClassLoader this               Load classes         Class lt   gt    classes   new Class lt   gt  testClasses size             for  int i 0  i lt testClasses size    i                  String test   testClasses get i               try                   classes i    Class forName test                 catch  ClassNotFoundException e                    String msg    Unable to find class file for test    test     Make sure all                              tests sources are either included in this test target via a  src                               declaration                    throw new BuildException msg  e                                       Run         JUnitCore junit   new JUnitCore            ensureLoadedInIsolatedClassLoader junit           junit addListener               junit run classes              private static void ensureLoadedInIsolatedClassLoader Object o            String objectClassLoader   o getClass   getClassLoader   getClass   getName                NB  Can t do instanceof here because they are not instances of each other          if   objectClassLoader equals IsolatedURLClassLoader class getName                   throw new IllegalStateException String format                       Instance of  s not loaded by a IsolatedURLClassLoader  loaded by  s                        cls  objectClassLoader                        THEN  you need to invoke the runner via reflection   Class lt   gt  runnerClass   isolatedClassLoader loadClass ClassLoaderIsolatedTestRunner class getName         Invoke via reflection  List class is OK because it just uses the string form of it  Object runner   runnerClass newInstance    Method method   runner getClass   getMethod  run invokedReflectively   List class   method invoke

User · Answer

In Eclipse  I had to use New  gt  Other  gt  JUnit  gt  Junit Test  A Java class created with the exact same text gave me the error  perhaps because it was using JUnit 3 x

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I faced the same with my parent test setUp class which has annotation  RunWith SpringRunner class  and was being extended by other testClasses  As there was not test in the setUpclass   and Junit was trying to find one due to annotation  RunWith SpringRunner class   it didn t find one and threw exception   No runnable methods exception in running JUnits  I made my parent class as abstract and it worked like a charm    I took help from here https   stackoverflow com a 10699141 8029525   Thanks for help  froh42

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The simplest solution is to add  Test annotated method to class where initialisation exception is present   In our project we have main class with initial settings  I ve added  Test method and exception has disappeared

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I had to change the import statement   import org junit jupiter api Test    to  import org junit Test

[java] java.lang.Exception: No runnable methods exception in running JUnits

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