java lang NoClassDefFoundError org hamcrest SelfDescribing

Question

While running junit test in eclipse I am getting this Exception   java lang NoClassDefFoundError  org hamcrest SelfDescribing   I ve added junit jar library file   I ve tried different versions of junit jar  4 4  4 8  etc   How do I fix this Exception

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You need junit-dep jar because the junit jar has a copy of old Hamcrest classes

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A few steps you have to follow    Right click on the project  Choose Build Path Then from its menu choose Add Libraries  Choose JUnit then click Next  Choose JUnit4 then Finish

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Add hamcrest-all-X X jar to your classpath   Latest version as of Feb 2015 is 1 3   http   code google com p hamcrest downloads detail name hamcrest-all-1 3 jar amp can 2 amp q

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I had the same problem  the solution is to add in build path plugin the jar org hamcrest core 1xx  you can find it in eclipse plugins

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Just in case there s anyone here using netbeans and has the same problem  all you have to do is    Right click on TestLibraries Click on Add Library Select JUnit and click add library Repeat the process but this time click on Hamcrest and the click add library   This should solve the problem

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There is a better answer to solve this problem  add dependency   lt dependency gt       lt groupId gt org hamcrest lt  groupId gt       lt artifactId gt hamcrest-all lt  artifactId gt       lt version gt 1 3 lt  version gt       lt scope gt test lt  scope gt   lt  dependency gt

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the simplest way of solving the problem to begin with is copying latest version of    hamcrest-code jar     into your CLASSPATH that is the file you store other  jar files needed for compilation and running of your application   that could be e g   C  ant lib

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Works for me  IntelliJ IDEA 13 1 1  JUnit4  Java 6  I changed the file in project path   PROJECT NAME  iml  Replaced      lt library gt       lt CLASSES gt         lt root url  jar    APPLICATION HOME DIR  lib junit-4 11 jar      gt       lt  CLASSES gt       lt JAVADOC   gt       lt SOURCES   gt     lt  library gt    By      lt library name  JUnit4  gt       lt CLASSES gt         lt root url  jar    APPLICATION HOME DIR  lib junit-4 11 jar      gt         lt root url  jar    APPLICATION HOME DIR  lib hamcrest-core-1 3 jar      gt         lt root url  jar    APPLICATION HOME DIR  lib hamcrest-library-1 3 jar      gt       lt  CLASSES gt       lt JAVADOC   gt       lt SOURCES   gt     lt  library gt    So the final  iml file is    lt  xml version  1 0  encoding  UTF-8   gt   lt module type  JAVA MODULE  version  4  gt     lt component name  NewModuleRootManager  inherit-compiler-output  true  gt       lt exclude-output   gt       lt content url  file    MODULE DIR   gt         lt sourceFolder url  file    MODULE DIR  src  isTestSource  false    gt         lt sourceFolder url  file    MODULE DIR  tests  isTestSource  true    gt       lt  content gt       lt orderEntry type  inheritedJdk    gt       lt orderEntry type  sourceFolder  forTests  false    gt       lt orderEntry type  module-library  gt         lt library name  JUnit4  gt           lt CLASSES gt             lt root url  jar    APPLICATION HOME DIR  lib junit-4 11 jar      gt             lt root url  jar    APPLICATION HOME DIR  lib hamcrest-core-1 3 jar      gt             lt root url  jar    APPLICATION HOME DIR  lib hamcrest-library-1 3 jar      gt           lt  CLASSES gt           lt JAVADOC   gt           lt SOURCES   gt         lt  library gt       lt  orderEntry gt     lt  component gt   lt  module gt    P S   save the file and don t let to IntelliJ Idea reload it  Just once

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If this problem arise in a RCP project it can be because JUnit has been explicitly imported    Check the editor for your plugin xml under Dependencies tab  remove the org junit from the Imported Packages and add org junit to the Required Plug-ins

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According to the JUnit GitHub team website  https   github com junit-team junit wiki Download-and-Install   junit jar and hamcrest-core jar are both needed in the classpath when using JUnit 4 11   Here is the Maven dependency block for including junit and hamcrest    lt dependency gt       lt groupId gt junit lt  groupId gt       lt artifactId gt junit lt  artifactId gt       lt version gt 4 1 2 lt  version gt       lt scope gt test lt  scope gt   lt  dependency gt   lt  -- Needed by junit -- gt   lt dependency gt       lt groupId gt org hamcrest lt  groupId gt       lt artifactId gt hamcrest-all lt  artifactId gt       lt version gt 1 3 lt  version gt       lt scope gt test lt  scope gt   lt  dependency gt

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You need to add the hamcrest-core JAR to the classpath as described here  https   github com junit-team junit4 wiki Download-and-Install

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The problem is when you set up eclipse to point to JRE instead of JDK  JRE has junit4 jar in the lib ext folder  but not hamcrest jar    So the solution is to check installed JREs in Eclipse  remove the existing one and create a new one pointing to your JDK

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It sounds like a classpath issue  so there are a few different ways to go about it  Where does org hamcret SelfDescribing come from  Is that your class or in a different jar    Try going to your project Build Path and on the Libraries tab  add a Library  You should be able to choose JUnit to your project  This is a little bit different than just having the JUnit jar file In your project    In your Run Configuration for the JUnit test  check the Classpath  You could probably fix this by adding making sure your Classpath can see that SelfDescribing class there  The Run option in Eclipse has a different set of options for the JUnit options

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This problem is because of your classpath miss hamcrest-core-1 3 jar  To resolve this add hamcrest-core-1 3 jar as you add junit-4 XX jar into your classpath   At first  I encounter this problem too  but after I refer to the official site and add hamcrest-core-1 3 jar into classpath with command line  it works properly finally   javac -d             bin  -cp   libs junit-4 12 jar  home limxtop projects algorithms bin  MaxHeapTest java   java -cp             bin   home limxtop libs junit-4 12 jar  home limxtop libs hamcrest-core-1 3 jar org junit runner JUnitCore com limxtop heap MaxHeapTest

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This happens when you run Ant via command line  The implicit user dependencies are added in the classpath at the end and take precedence over the project-added classpath  Run Ant with -nouserlib flag  The implicit dependencies would be excluded from the classpath

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The hamcrest-core-1 3 jar available on maven repository is deprecated  Download working hamcrest-core-1 3 jar from official Junit4 github link   If you want to download from maven repository  use latest hamcrest-XX jar   lt dependency gt       lt groupId gt org hamcrest lt  groupId gt       lt artifactId gt hamcrest lt  artifactId gt       lt version gt 2 2 lt  version gt       lt scope gt test lt  scope gt   lt  dependency gt

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As a general rule  always make sure hamcrest is before any other testing libraries on the classpath  as many such libraries include hamcrest classes and may therefore conflict with the hamcrest version you re using  This will resolve most problems of the type you re describing

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A few steps you have to follow    Right click on the project  Choose Build Path  amp  then from its menu choose Add Libraries  Choose JUnit then click Next  Choose JUnit4 then Finish    This works for me

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quot java lang SecurityException  class quot  org hamcrest Matchers  quot  s signer information does not match signer information of other classes in the same package quot  Do it  Right-click on your package click on Build Path - gt  Configure Build Path Click on the Libraries tab Remove JUnit Apply and close Ready

[java] java.lang.NoClassDefFoundError: org/hamcrest/SelfDescribing

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