以下是错误信息
环境是华为云的 CentOS 8.2
java环境的jdk版本为16
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2021-08-30 13:52:21.091 INFO 8983 --- [ main] c.sunofbeaches.android.MainApplication : Starting MainApplication v1.0-SNAPSHOT on quietly with PID 8983 (/home/sob-android-mini-web-1.0.0.jar started by root in /home)
2021-08-30 13:52:21.095 INFO 8983 --- [ main] c.sunofbeaches.android.MainApplication : No active profile set, falling back to default profiles: default
2021-08-30 13:52:21.241 INFO 8983 --- [ main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@548ad73b: startup date [Mon Aug 30 13:52:21 CST 2021]; root of context hierarchy
2021-08-30 13:52:22.981 ERROR 8983 --- [ main] o.s.boot.SpringApplication : Application run failed
java.lang.IllegalStateException: Cannot load configuration class: com.sunofbeaches.android.MainApplication
at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:414) ~[spring-context-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanFactory(ConfigurationClassPostProcessor.java:254) ~[spring-context-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:284) ~[spring-context-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:128) ~[spring-context-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:694) ~[spring-context-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:532) ~[spring-context-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.0.3.RELEASE.jar!/:2.0.3.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) ~[spring-boot-2.0.3.RELEASE.jar!/:2.0.3.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:395) ~[spring-boot-2.0.3.RELEASE.jar!/:2.0.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:327) ~[spring-boot-2.0.3.RELEASE.jar!/:2.0.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1255) ~[spring-boot-2.0.3.RELEASE.jar!/:2.0.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1243) ~[spring-boot-2.0.3.RELEASE.jar!/:2.0.3.RELEASE]
at com.sunofbeaches.android.MainApplication.main(MainApplication.java:13) ~[classes!/:1.0-SNAPSHOT]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:567) ~[na:na]
at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) ~[sob-android-mini-web-1.0.0.jar:1.0-SNAPSHOT]
at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) ~[sob-android-mini-web-1.0.0.jar:1.0-SNAPSHOT]
at org.springframework.boot.loader.Launcher.launch(Launcher.java:50) ~[sob-android-mini-web-1.0.0.jar:1.0-SNAPSHOT]
at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:51) ~[sob-android-mini-web-1.0.0.jar:1.0-SNAPSHOT]
Caused by: java.lang.ExceptionInInitializerError: null
at org.springframework.context.annotation.ConfigurationClassEnhancer.newEnhancer(ConfigurationClassEnhancer.java:122) ~[spring-context-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer.enhance(ConfigurationClassEnhancer.java:110) ~[spring-context-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:403) ~[spring-context-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
... 20 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 @56cbfb61
at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:464) ~[spring-core-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:336) ~[spring-core-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:93) ~[spring-core-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:91) ~[spring-core-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54) ~[spring-core-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na]
at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61) ~[spring-core-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34) ~[spring-core-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:116) ~[spring-core-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:291) ~[spring-core-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at org.springframework.cglib.core.KeyFactory$Generator.create(KeyFactory.java:221) ~[spring-core-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at org.springframework.cglib.core.KeyFactory.create(KeyFactory.java:174) ~[spring-core-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at org.springframework.cglib.core.KeyFactory.create(KeyFactory.java:153) ~[spring-core-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at org.springframework.cglib.proxy.Enhancer.<clinit>(Enhancer.java:73) ~[spring-core-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
... 23 common frames omitted
Caused by: 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 @56cbfb61
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:357) ~[na:na]
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297) ~[na:na]
at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:199) ~[na:na]
at java.base/java.lang.reflect.Method.setAccessible(Method.java:193) ~[na:na]
at org.springframework.cglib.core.ReflectUtils$1.run(ReflectUtils.java:61) ~[spring-core-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at java.base/java.security.AccessController.doPrivileged(AccessController.java:554) ~[na:na]
at org.springframework.cglib.core.ReflectUtils.<clinit>(ReflectUtils.java:52) ~[spring-core-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at org.springframework.cglib.core.KeyFactory$Generator.generateClass(KeyFactory.java:243) ~[spring-core-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at org.springframework.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25) ~[spring-core-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:329) ~[spring-core-5.0.7.RELEASE.jar!/:5.0.7.RELEASE]
... 35 common frames omitted
2021-08-30 13:52:22.983 INFO 8983 --- [ main] ConfigServletWebServerApplicationContext : Closing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@548ad73b: startup date [Mon Aug 30 13:52:21 CST 2021]; root of context hierarchy
直接用网站的API学习吧，在顶部APIs。