unit测试出现异常：Exception in thread "main" java.lang.NoSuchMethodError: org.junit.platform.commons.util

在进行单元测试时，测试出现异常

Exception in thread "main" java.lang.NoSuchMethodError: org.junit.platform.commons.util.ReflectionUtils.getDefaultClassLoader()Ljava/lang/ClassLoader; at org.junit.platform.launcher.core.ServiceLoaderTestEngineRegistry.loadTestEngines(ServiceLoaderTestEngineRegistry.java:30) at org.junit.platform.launcher.core.LauncherFactory.create(LauncherFactory.java:53) at com.intellij.junit5.JUnit5IdeaTestRunner.createListeners(JUnit5IdeaTestRunner.java:39) at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:49) at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

https://junit.org/junit5/docs/current/user-guide/#running-tests-ide-intellij-idea

 

pom.xml依赖以下

<dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency> <dependency> <groupId>org.junit.jupiter</groupId> <artifactId>junit-jupiter-api</artifactId> <version>RELEASE</version> </dependency> </dependencies>

 

问题缘由 
错误就在pom.xml的依赖中，仔细查看控制台输出你会发现IntelliJ IDEA正在尝试使用JUnit5运行个人测试用例。

at com.intellij.junit5.JUnit5IdeaTestRunner.createListeners(JUnit5IdeaTestRunner.java:39)

经过pom.xml发现，我但愿使用JUnit4.12运行测试用例，咱们查看pom.xml发现junit-jupiter-api这个依赖会致使这个错误。

<dependency> <groupId>org.junit.jupiter</groupId> <artifactId>junit-jupiter-api</artifactId> <version>RELEASE</version> </dependency>

 

由于此模块专为JUnit5而设计 -https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api

解决方案

一、删除pom.xml中org.junit.jupiter依赖 
二、Reimport All Maven Project