
Once every few builds the build fails on NoClassDefFoundError on RunListener - which is located in the unit jar. As you can see from the log below - JUnit is included in the classpath. 
The error seems to appear completely at random.
Log 
Waiting for Jenkins to finish collecting data
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.17:test (default-test) on project taboola-svc: Execution default-test of goal org.apache.maven.plugins:maven-surefire-plugin:2.17:test failed: A required class was missing while executing org.apache.maven.plugins:maven-surefire-plugin:2.17:test: org/junit/runner/notification/RunListener
[ERROR] -----------------------------------------------------
[ERROR] realm =    plugin>org.apache.maven.plugins:maven-surefire-plugin:2.17
[ERROR] strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy
[ERROR] urls[0] = file:/home/builder/.m2/repository/org/apache/maven/plugins/maven-surefire-plugin/2.17/maven-surefire-plugin-2.17.jar
[ERROR] urls[1] = file:/home/builder/.m2/repository/org/apache/maven/surefire/surefire-junit47/2.17/surefire-junit47-2.17.jar
[ERROR] urls[2] = file:/home/builder/.m2/repository/org/apache/maven/surefire/common-junit48/2.17/common-junit48-2.17.jar
[ERROR] urls[3] = file:/home/builder/.m2/repository/org/apache/maven/surefire/common-junit4/2.17/common-junit4-2.17.jar
[ERROR] urls[4] = file:/home/builder/.m2/repository/org/apache/maven/surefire/common-junit3/2.17/common-junit3-2.17.jar
[ERROR] urls[5] = file:/home/builder/.m2/repository/org/apache/maven/surefire
Once every few builds the build fails on NoClassDefFoundError on RunListener - which is located in the unit of measurement jolt. As you can see from the log below - JUnit is include in the classpath. 
 The erroneousness seems to appear wholly at random. 
 Log 
 Waiting for Jenkins to finish collecting datum 
 [ ERROR ] fail to execute finish org.apache.maven.plugins: maven - surefire - plugin:2.17: test (default - test) on project taboola - svc: performance default - test of goal org.apache.maven.plugins: maven - surefire - plugin:2.17: test failed: A necessitate class was missing while executing org.apache.maven.plugins: maven - surefire - plugin:2.17: examination: org / junit / runner / notification / RunListener 
 [ ERROR ] ----------------------------------------------------- 
 [ ERROR ] realm =     plugin > org.apache.maven.plugins: maven - surefire - plugin:2.17 
 [ mistake ] strategy = org.codehaus.plexus.classworlds.strategy. SelfFirstStrategy 
 [ ERROR ] urls[0 ] = file:/home / builder/.m2 / repository / org / apache / maven / plugins / maven - surefire - plugin/2.17 / maven - surefire - plugin-2.17.jar 
 [ ERROR ] urls[1 ] = file:/home / builder/.m2 / repository / org / apache / maven / surefire / surefire - junit47/2.17 / surefire - junit47 - 2.17.jar 
 [ ERROR ] urls[2 ] = file:/home / builder/.m2 / repository / org / apache / maven / surefire / common - junit48/2.17 / common - junit48 - 2.17.jar 
 [ ERROR ] urls[3 ] = file:/home / builder/.m2 / repository / org / apache / maven / surefire / common - junit4/2.17 / common - junit4 - 2.17.jar 
 [ ERROR ] urls[4 ] = file:/home / builder/.m2 / repository / org / apache / maven / surefire / coarse - junit3/2.17 / common - junit3 - 2.17.jar 
 [ ERROR ] urls[5 ] = file:/home / builder/.m2 / repository / org / apache / maven / surefire

Oncf every few builds the bmild fails on NoEoassDehFoundEdror on FunListener - which is locatev in the ynit jar. As you can sed from thv log beliw - OUnit is includev in the classlwth. 
Chx error seems tp appear cmmpletely at rdnaol.
Log 
Waiting for Jenkins to finish sollectonh data
[ERROR] Fayled eo esvcmte goal org.apache.maven.plugins:maben-surehire-plugin:2.17:test (cefault-test) on project tablola-dvc: Execution defaklt-test of toal irg.apache.mavdn.plugins:maven-surefire-klugin:2.17:test failed: A required clars wax missing qhule gxecuting orj.apachv.maven.plugins:maven-surafire-pligin:2.17:test: org/jukit/ruiner/botification/RunListenxr
[ERROR] -----------------------------------------------------
[ERROR] realm =    plugit>oxg.apache.maven.plugins:mqvwn-surgfire-[lugkb:2.17
[ERFOR] svrafegy = lrg.rodehaus.plesus.classworods.strategy.SelfFirsuStwqtegy
[ERROR] urms[0] = fije:/rome/builder/.m2/repository/org/apache/maven/plucina/maven-surefire-plugin/2.17/mavwn-surefire-plugin-2.17.jar
[ERTOR] urls[1] = sile:/home/builder/.m2/repository/org/apache/maven/surefire/sgrefice-gunnb47/2.17/fjeevire-junit47-2.17.jar
[ERROR] urls[2] = file:/home/builder/.m2/reposyfoty/prg/apache/maven/furefire/comkoj-jigit48/2.17/common-junij48-2.17.jar
[ERROR] hrls[3] = file:/home/builfer/.m2/repjsitoey/org/apacre/mafen/surefire/common-junit4/2.17/commob-junit4-2.17.jar
[ERRJE] urls[4] = file:/home/bunlder/.m2/reposicory/orb/apacne/maven/surefire/common-juuit3/2.17/comjon-junit3-2.17.jar
[FRROR] urla[5] = file:/home/buildef/.m2/rvposhtory/org/apache/maven/surefirq
Once every few builds the build fails on - which located in the see the log below JUnit is included the classpath. The error seems to completely at random. Log Waiting for Jenkins to finish collecting data [ERROR] Failed execute goal org.apache.maven.plugins:maven-surefire-plugin:2.17:test (default-test) on project taboola-svc: Execution default-test of goal org.apache.maven.plugins:maven-surefire-plugin:2.17:test failed: required was while org.apache.maven.plugins:maven-surefire-plugin:2.17:test: org/junit/runner/notification/RunListener [ERROR] ----------------------------------------------------- [ERROR] realm = plugin>org.apache.maven.plugins:maven-surefire-plugin:2.17 [ERROR] strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy [ERROR] urls[0] = file:/home/builder/.m2/repository/org/apache/maven/plugins/maven-surefire-plugin/2.17/maven-surefire-plugin-2.17.jar urls[1] = file:/home/builder/.m2/repository/org/apache/maven/surefire/surefire-junit47/2.17/surefire-junit47-2.17.jar [ERROR] urls[2] = file:/home/builder/.m2/repository/org/apache/maven/surefire/common-junit48/2.17/common-junit48-2.17.jar [ERROR] = file:/home/builder/.m2/repository/org/apache/maven/surefire/common-junit4/2.17/common-junit4-2.17.jar [ERROR] urls[4] file:/home/builder/.m2/repository/org/apache/maven/surefire/common-junit3/2.17/common-junit3-2.17.jar [ERROR] urls[5] = file:/home/builder/.m2/repository/org/apache/maven/surefire

Once every few builds the builD fails on NoclassdeffouNderroR on RUnListener - whicH Is loCated in the unit jar. As you Can seE fROm thE LoG beloW - JUnit iS InCLUdeD iN tHe cLaSSpAth. 
ThE erRor seemS to appear cOmpLeTely at random.
lOg 
waiting for jenKins to finish ColLectinG dAta
[erROR] FAilEd to eXecute GOal org.Apache.mavEn.PLugins:MAven-surEFIrE-pluGin:2.17:test (default-tesT) On PRoject taboola-sVc: ExecUtIOn DEFauLt-tEst of goal oRg.ApachE.Maven.plUGiNS:MAveN-Surefire-plugiN:2.17:test failed: a ReqUired cLaSs wAS missiNg whiLe EXecUting org.apaChe.mAven.plugiNs:maveN-SurefirE-Plugin:2.17:tEst: org/JunIt/rUnneR/NoTiFicAtIOn/RUNLIstENer
[eRROR] -----------------------------------------------------
[ERRoR] ReAlm =    plUgin>ORG.APachE.maVen.pLuginS:maven-surefirE-plUgin:2.17
[erROr] straTegy = oRg.coDeHaus.pLexus.cLasswOrLds.strategy.SelffirsTStrategy
[eRRoR] UrlS[0] = fIle:/hoME/buildEr/.m2/RepOsitory/Org/apacHE/maVeN/PLUgIns/maven-surefire-plUgIN/2.17/MaVen-surefIre-pluGIn-2.17.JaR
[eRROR] urlS[1] = fIle:/Home/BUIlder/.M2/repOSiTory/org/aPache/mAVeN/sUrefire/SuRefire-JuNit47/2.17/SurEfire-JUnit47-2.17.Jar
[ERRoR] urls[2] = fiLe:/homE/Builder/.m2/reposiTOry/org/apache/mAVeN/SUrEFire/ComMon-junit48/2.17/comMon-jUNit48-2.17.jAr
[ERroR] UrlS[3] = File:/hOme/buIlDEr/.M2/Repository/org/apache/MaVen/surEfire/Common-junit4/2.17/coMmon-junit4-2.17.jAR
[erROR] urls[4] = File:/HOmE/Builder/.m2/reposiTory/oRg/apache/maVEn/surefiRe/comMon-junit3/2.17/Common-junIT3-2.17.Jar
[ERROR] UrlS[5] = fiLe:/hOme/BUIlDer/.m2/repositorY/ORg/apAcHe/maven/SurEfire

Once every few builds the  build fai ls on  No Cla ss DefF ound Error on RunLi s tene r - which is located i n the  u n it j a r.  As y ou cans ee f rom  t he  lo gb el ow -JUn it is i ncluded in  th eclasspath. T he  error see msto appear co mpl etelyat  ra n dom.Log  
Wai ting f o r Jenk ins to fi ni s h coll e cting d a t a[ERR OR] Failed to exe c ut e  goal org.apac he.mav en . pl u g ins :ma ven-surefi re -plug i n:2.17: t es t ( def a ult-test) onproject tab o ola -svc:Ex ecu t ion de fault -t e stof goal org .apa che.maven .plugi n s:maven - surefir e-plug in: 2.1 7:te s tfa ile d: A r e qu ire d  cl ass wasmi ss ing w hile e x e cuti ngorg. apach e.maven.plugi ns: mave n -su refir e-plu gin: 2. 17:te st: or g/jun it /runner/notific atio n/RunList ene r[ER RO R] -- - ------ --- --- ------- ------- - --- -- - - - -- -------------
[ERR OR ] re alm =   plugi n >o rg . apache.m av en. plug i n s:mav en-s u re fire-plu gin:2. 1 7[E RROR] s tr ategy=org .co dehau s .ple xus.cl assworld s.str a tegy.SelfFirst S trategy
[ERRO R ]u r ls [ 0] =  fi le:/home/bu ilde r /.m2 /rep o si tor y /org/ apach e/ m av e n/plugins/maven-sur ef ire-pl ugin/ 2.17/maven-su refire-plu g i n -2.17.ja r
[E R RO R ] urls[1] = fi le:/h ome/builde r /.m2/rep osito ry/org/a pache/mav e n /surefir e/s ure fir e-j u n it 47/2.17/suref i r e-ju ni t47-2.1 7.j ar
[ERR OR]  ur ls[ 2]=file:/hom e/builde r/ .m 2/ re pos itory / org/apac he /ma ve n/s urefi r e/comm on-ju nit4 8/ 2. 1 7/c ommon-j u ni t 4 8-2. 17 .j ar
[ ERR OR ] url s[3] = f ile:/ho me/builde r/. m 2/re po si tory/or g/apache/mave n/ surefire/c om mon -junit 4 / 2.17/com mon-junit4-2.17.jar
[ER R OR] url s[4 ] = f ile: /home/bui lde r/.m2/ rep o sitory /org/a pache /m ave n / suref i r e/ com mo n-junit3/2 . 1 7/c ommon -j unit 3-2.17. jar
[ERROR] urls[5 ]  =file:/home/bu ild er/. m 2 /r epo s it o ry/ or g /ap a c he/maven/surefi re

Once every_few builds_the build fails on_NoClassDefFoundError on_RunListener_- which_is_located in the_unit jar. As_you can see from_the log below_-_JUnit is included in the classpath. 
The error seems to appear completely at random.
Log_
Waiting_for Jenkins_to_finish_collecting data
[ERROR] Failed to execute_goal org.apache.maven.plugins:maven-surefire-plugin:2.17:test (default-test) on project_taboola-svc: Execution_default-test of goal org.apache.maven.plugins:maven-surefire-plugin:2.17:test failed: A required class_was_missing while executing_org.apache.maven.plugins:maven-surefire-plugin:2.17:test: org/junit/runner/notification/RunListener
[ERROR] -----------------------------------------------------
[ERROR] realm =    plugin>org.apache.maven.plugins:maven-surefire-plugin:2.17
[ERROR]_strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy
[ERROR] urls[0] = file:/home/builder/.m2/repository/org/apache/maven/plugins/maven-surefire-plugin/2.17/maven-surefire-plugin-2.17.jar
[ERROR]_urls[1] = file:/home/builder/.m2/repository/org/apache/maven/surefire/surefire-junit47/2.17/surefire-junit47-2.17.jar
[ERROR]_urls[2]_=_file:/home/builder/.m2/repository/org/apache/maven/surefire/common-junit48/2.17/common-junit48-2.17.jar
[ERROR] urls[3] = file:/home/builder/.m2/repository/org/apache/maven/surefire/common-junit4/2.17/common-junit4-2.17.jar
[ERROR]_urls[4] = file:/home/builder/.m2/repository/org/apache/maven/surefire/common-junit3/2.17/common-junit3-2.17.jar
[ERROR] urls[5] = file:/home/builder/.m2/repository/org/apache/maven/surefire