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依赖如下

<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>

问题原因 
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运行我的测试用例。

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

通过pom.xml发现，我希望使用JUnit4.12运行测试用例，我们查看pom.xml发现junit-jupiter-api这个依赖会导致这个错误。

<dependency>

    <groupId>org.junit.jupiter</groupId>

    <artifactId>junit-jupiter-api</artifactId>

    <version>RELEASE</version>

</dependency>

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

解决方案

1、删除pom.xml中org.junit.jupiter依赖 
2、Reimport All Maven Project