Mac 下 Eclipse 导入 JUnit 问题

Question

代码如下：

package junit1;

import org.junit.Test;

public class JUnitTest {

@Test
public void test() {
    System.out.println("AA");
}

}

输出报错

java.lang.NoClassDefFoundError: org/junit/platform/engine/ConfigurationParameters
at org.eclipse.jdt.internal.junit5.runner.JUnit5TestLoader.(JUnit5TestLoader.java:34)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:78)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
at java.base/java.lang.reflect.ReflectAccess.newInstance(ReflectAccess.java:128)
at java.base/jdk.internal.reflect.ReflectionFactory.newInstance(ReflectionFactory.java:350)
at java.base/java.lang.Class.newInstance(Class.java:642)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.createRawTestLoader(RemoteTestRunner.java:371)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.createLoader(RemoteTestRunner.java:366)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.defaultInit(RemoteTestRunner.java:310)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.init(RemoteTestRunner.java:225)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:209)
Caused by: java.lang.ClassNotFoundException: org.junit.platform.engine.ConfigurationParameters
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:636)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:182)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519)
... 13 more
7

Answer 1

java.lang.NoClassDefFoundError: org/junit/platform/engine/ConfigurationParameters

这个代表你没有加入对应的依赖，也就是缺少jar包，另外你用的不是JUnit4,而是JUnit5，但是
JUnit 5 = JUnit Platform + JUnit Jupiter + JUnit Vintage

JUnit Platform是提供了运行（测试框架）环境的平台
JUnit Jupiter 是新的Junit5（子项目提供了一个基于平台测试运行Jupiter的测试引擎）
JUnit Vintage提供了Junit3/4的测试引擎（向前兼容）

看看你是不是缺少哪个依赖项，然后百度进行下载缺少的依赖进行，导入