升级至Oracle JDK 11后TestNG无法实例化测试类问题

原本在Oracle JDK8+Eclipse环境正常运行的TestNG测试用例，升级到Oracle JDK11后抛出org.testng.TestNGException: Cannot instantiate class com.aa.bb.test.SomeTest异常。

现有依赖配置 #

pom.xml中相关依赖：

<dependency>
    <groupId>org.testng</groupId>
    <artifactId>testng</artifactId>
    <version>6.8</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-core</artifactId>
    <version>1.7.3</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-api-mockito2</artifactId>
    <version>1.7.3</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-module-testng</artifactId>
    <version>1.7.3</version>
    <scope>test</scope>
</dependency>

已尝试升级TestNG到7.x.x、PowerMock相关依赖到2.x.x，但问题依旧。

完整堆栈信息 #

org.testng.TestNGException: 
Cannot instantiate class com.aa.bb.test.SomeTest
    at org.testng.internal.ObjectFactoryImpl.newInstance(ObjectFactoryImpl.java:38)
    at org.testng.internal.ClassHelper.createInstance1(ClassHelper.java:387)
    at org.testng.internal.ClassHelper.createInstance(ClassHelper.java:299)
    at org.testng.internal.ClassImpl.getDefaultInstance(ClassImpl.java:110)
    at org.testng.internal.ClassImpl.getInstances(ClassImpl.java:186)
    at org.testng.internal.TestNGClassFinder.<init>(TestNGClassFinder.java:120)
    at org.testng.TestRunner.initMethods(TestRunner.java:409)
    at org.testng.TestRunner.init(TestRunner.java:235)
    at org.testng.TestRunner.init(TestRunner.java:205)
    at org.testng.TestRunner.<init>(TestRunner.java:160)
    at org.testng.remote.support.RemoteTestNG6_5$1.newTestRunner(RemoteTestNG6_5.java:27)
    at org.testng.remote.support.RemoteTestNG6_5$DelegatingTestRunnerFactory.newTestRunner(RemoteTestNG6_5.java:63)
    at org.testng.SuiteRunner$ProxyTestRunnerFactory.newTestRunner(SuiteRunner.java:561)
    at org.testng.SuiteRunner.init(SuiteRunner.java:157)
    at org.testng.SuiteRunner.<init>(SuiteRunner.java:111)
    at org.testng.TestNG.createSuiteRunner(TestNG.java:1273)
    at org.testng.TestNG.createSuiteRunners(TestNG.java:1260)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1114)
    at org.testng.TestNG.run(TestNG.java:1031)
    at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:115)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:251)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:77)
Caused by: java.lang.reflect.InvocationTargetException
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
    at org.testng.internal.ObjectFactoryImpl.newInstance(ObjectFactoryImpl.java:29)

1. 补充JDK9+必需的PowerMock代理依赖 #

PowerMock 2.x.x支持JDK11，但必须添加powermock-module-testng-agent依赖，这是JDK模块化环境下的核心配置，之前大概率遗漏了这个依赖。更新后的依赖示例：

<!-- TestNG 7.x 兼容PowerMock 2.x -->
<dependency>
    <groupId>org.testng</groupId>
    <artifactId>testng</artifactId>
    <version>7.7.1</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-core</artifactId>
    <version>2.0.9</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-api-mockito2</artifactId>
    <version>2.0.9</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-module-testng</artifactId>
    <version>2.0.9</version>
    <scope>test</scope>
</dependency>
<!-- JDK9+必须添加的TestNG代理依赖 -->
<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-module-testng-agent</artifactId>
    <version>2.0.9</version>
    <scope>test</scope>
</dependency>

2. 配置TestNG使用PowerMock的实例化工厂 #

在测试类中添加@ObjectFactory注解，指定PowerMock的对象工厂替代TestNG默认实现，解决类实例化失败问题：

import org.powermock.modules.testng.PowerMockObjectFactory;
import org.testng.annotations.ObjectFactory;

public class SomeTest {

    @ObjectFactory
    public ObjectFactory getObjectFactory() {
        return new PowerMockObjectFactory();
    }

    // 测试方法...
}

3. Eclipse中添加JDK11模块访问权限参数 #

如果项目是模块化结构（含module-info.java），需要在TestNG运行配置中添加VM参数，允许PowerMock访问JDK内部模块：

--add-opens java.base/java.lang=ALL-UNNAMED
--add-opens java.base/java.reflect=ALL-UNNAMED
--add-opens java.base/java.util=ALL-UNNAMED

添加路径：Eclipse → Run Configurations → 对应TestNG配置 → Arguments → VM arguments中粘贴上述内容。

4. 清理重建项目 #

• 执行mvn clean install清理旧依赖和编译文件
• Eclipse中执行Project → Clean清除本地编译缓存
• 重新运行测试用例

内容的提问来源于stack exchange，提问作者7msseven