Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass

从 Github 中下载 Demo 时遇到问题

java.lang.IllegalStateException: Cannot load configuration class: com.cxytiandi.sharding.ShardingDbTableApplicationat org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:414) ~[spring-context-5.0.10.RELEASE.jar:5.0.10.RELEASE]at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanFactory(ConfigurationClassPostProcessor.java:254) ~[spring-context-5.0.10.RELEASE.jar:5.0.10.RELEASE]at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:282) ~[spring-context-5.0.10.RELEASE.jar:5.0.10.RELEASE]at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:126) ~[spring-context-5.0.10.RELEASE.jar:5.0.10.RELEASE]at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:692) ~[spring-context-5.0.10.RELEASE.jar:5.0.10.RELEASE]at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:530) ~[spring-context-5.0.10.RELEASE.jar:5.0.10.RELEASE]at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.0.6.RELEASE.jar:2.0.6.RELEASE]at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) ~[spring-boot-2.0.6.RELEASE.jar:2.0.6.RELEASE]at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:386) ~[spring-boot-2.0.6.RELEASE.jar:2.0.6.RELEASE]at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) ~[spring-boot-2.0.6.RELEASE.jar:2.0.6.RELEASE]at org.springframework.boot.SpringApplication.run(SpringApplication.java:1242) ~[spring-boot-2.0.6.RELEASE.jar:2.0.6.RELEASE]at org.springframework.boot.SpringApplication.run(SpringApplication.java:1230) ~[spring-boot-2.0.6.RELEASE.jar:2.0.6.RELEASE]at com.cxytiandi.sharding.ShardingDbTableApplication.main(ShardingDbTableApplication.java:18) ~[classes/:na]
Caused by: java.lang.ExceptionInInitializerError: nullat org.springframework.context.annotation.ConfigurationClassEnhancer.newEnhancer(ConfigurationClassEnhancer.java:122) ~[spring-context-5.0.10.RELEASE.jar:5.0.10.RELEASE]at org.springframework.context.annotation.ConfigurationClassEnhancer.enhance(ConfigurationClassEnhancer.java:110) ~[spring-context-5.0.10.RELEASE.jar:5.0.10.RELEASE]at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:403) ~[spring-context-5.0.10.RELEASE.jar:5.0.10.RELEASE]... 12 common frames omitted
Caused by: org.springframework.cglib.core.CodeGenerationException: java.lang.reflect.InaccessibleObjectException-->Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @4f209819at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:464) ~[spring-core-5.0.10.RELEASE.jar:5.0.10.RELEASE]at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:336) ~[spring-core-5.0.10.RELEASE.jar:5.0.10.RELEASE]at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:93) ~[spring-core-5.0.10.RELEASE.jar:5.0.10.RELEASE]at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:91) ~[spring-core-5.0.10.RELEASE.jar:5.0.10.RELEASE]at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54) ~[spring-core-5.0.10.RELEASE.jar:5.0.10.RELEASE]at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na]at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61) ~[spring-core-5.0.10.RELEASE.jar:5.0.10.RELEASE]at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34) ~[spring-core-5.0.10.RELEASE.jar:5.0.10.RELEASE]at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:116) ~[spring-core-5.0.10.RELEASE.jar:5.0.10.RELEASE]at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:291) ~[spring-core-5.0.10.RELEASE.jar:5.0.10.RELEASE]at org.springframework.cglib.core.KeyFactory$Generator.create(KeyFactory.java:221) ~[spring-core-5.0.10.RELEASE.jar:5.0.10.RELEASE]at org.springframework.cglib.core.KeyFactory.create(KeyFactory.java:174) ~[spring-core-5.0.10.RELEASE.jar:5.0.10.RELEASE]at org.springframework.cglib.core.KeyFactory.create(KeyFactory.java:153) ~[spring-core-5.0.10.RELEASE.jar:5.0.10.RELEASE]at org.springframework.cglib.proxy.Enhancer.<clinit>(Enhancer.java:73) ~[spring-core-5.0.10.RELEASE.jar:5.0.10.RELEASE]... 15 common frames omitted

这是由于 JDK 8 中有关反射相关的功能，从 JDK 9 开始就已经被限制了。

为了兼容原先的版本，需要在 “Edit Configurations” 中 ——> “VM options” 输入框中输入添加 --add-opens java.base/java.lang=ALL-UNNAMED 选项来开启这种默认不被允许的行为。

除了添加VM启动参数外，如果 pom.xml 文件中含有 <java.version> 标签，需要一并将 java8 改为当前 java 版本

<properties><java.version>17</java.version>
</properties>

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