【debug】getAnnotation(Class.class) 为空问题

最新推荐文章于 2023-12-26 10:54:27 发布
原创 最新推荐文章于 2023-12-26 10:54:27 发布 · 2.3k 阅读 · 3 ·
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#anotation #注解拿不到对象 #getAnnotation

本文讲述了在自定义类名与系统内置类名相同情况下，如何避免类导入错误的问题。通过检查和确认导入类的具体类型，避免因类加载器不同或切面编程导致的错误。

出现这种情况的原因有很多，

今天我遇到的是最坑的一种情况：

import 错误的类

我自定义了一个Person，可系统本身有2个Person类。

所以，解决办法：确认要 getAnotation(params) 中 params 类型是你要的类型。

导包还是要自己导啊。

其他问题参考：

1. 类加载器不同导致

2.切面编程的坑

一个小技巧，喜欢请点赞。（一股快手风 --!）

（排坑）自定义注解通过Method类‘getAnnotation()’取值为‘NULL’
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Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@323ebcc6] 2025-08-28 10:06:27.938 DEBUG 24804 --- [ main] o.s.a.aspectj.AspectJExpressionPointcut : Could not access current invocation - matching with limited context: java.lang.IllegalStateException: No MethodInvocation found: Check that an AOP invocation is in progress and that the ExposeInvocationInterceptor is upfront in the interceptor chain. Specifically, note that advices with order HIGHEST_PRECEDENCE will execute before ExposeInvocationInterceptor! 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org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@623a8092, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@157853da, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizerFactory$Customizer@306cf3ea], resourceBasePath = 'src/main/webapp', contextLoader = 'org.springframework.boot.test.context.SpringBootContextLoader', parent = [null]]] 2025-08-28 10:06:27.948 DEBUG 24804 --- [ main] org.springframework.test.context.cache : Spring test ApplicationContext cache statistics: [DefaultContextCache@41058886 size = 1, maxSize = 32, parentContextCount = 0, hitCount = 6, missCount = 1] 2025-08-28 10:06:27.950 DEBUG 24804 --- [ main] c.DefaultCacheAwareContextLoaderDelegate : Retrieved ApplicationContext [8996952] 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org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@623a8092, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@157853da, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizerFactory$Customizer@306cf3ea], resourceBasePath = 'src/main/webapp', contextLoader = 'org.springframework.boot.test.context.SpringBootContextLoader', parent = [null]]] 2025-08-28 10:06:27.955 DEBUG 24804 --- [ main] org.springframework.test.context.cache : Spring test ApplicationContext cache statistics: [DefaultContextCache@41058886 size = 1, maxSize = 32, parentContextCount = 0, hitCount = 10, missCount = 1] 2025-08-28 10:06:27.957 DEBUG 24804 --- [ main] c.DefaultCacheAwareContextLoaderDelegate : Retrieved ApplicationContext [8996952] 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'{org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true}', contextCustomizers = set[org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@313b2ea6, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@623a8092, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@157853da, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizerFactory$Customizer@306cf3ea], resourceBasePath = 'src/main/webapp', contextLoader = 'org.springframework.boot.test.context.SpringBootContextLoader', parent = [null]], attributes = map['org.springframework.test.context.web.ServletTestExecutionListener.activateListener' -> true, 'org.springframework.test.context.web.ServletTestExecutionListener.populatedRequestContextHolder' -> true, 'org.springframework.test.context.web.ServletTestExecutionListener.resetRequestContextHolder' -> true]], class annotated with @DirtiesContext [false] with mode [null], method annotated with @DirtiesContext [false] with mode [null]. 2025-08-28 10:06:27.958 DEBUG 24804 --- [ main] o.s.t.c.w.ServletTestExecutionListener : Resetting RequestContextHolder for test context [DefaultTestContext@4758820d testClass = SyncBmsDataTestServicess, testInstance = com.depower.SyncBmsDataTestServicess@6362dcf2, testMethod = syncDataTest@SyncBmsDataTestServicess, testException = java.lang.NullPointerException, mergedContextConfiguration = [WebMergedContextConfiguration@74eb909f testClass = SyncBmsDataTestServicess, locations = '{}', classes = '{class com.depower.DepowerApplication}', contextInitializerClasses = '[]', activeProfiles = '{}', propertySourceLocations = '{}', propertySourceProperties = '{org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true}', contextCustomizers = set[org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@313b2ea6, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@623a8092, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@157853da, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizerFactory$Customizer@306cf3ea], resourceBasePath = 'src/main/webapp', contextLoader = 'org.springframework.boot.test.context.SpringBootContextLoader', parent = [null]], attributes = map['org.springframework.test.context.web.ServletTestExecutionListener.activateListener' -> true, 'org.springframework.test.context.web.ServletTestExecutionListener.populatedRequestContextHolder' -> true, 'org.springframework.test.context.web.ServletTestExecutionListener.resetRequestContextHolder' -> true]]. 2025-08-28 10:06:27.965 DEBUG 24804 --- [ main] c.DefaultCacheAwareContextLoaderDelegate : Retrieved ApplicationContext [8996952] from cache with key [[WebMergedContextConfiguration@74eb909f testClass = SyncBmsDataTestServicess, locations = '{}', classes = '{class com.depower.DepowerApplication}', contextInitializerClasses = '[]', activeProfiles = '{}', propertySourceLocations = '{}', propertySourceProperties = '{org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true}', contextCustomizers = set[org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@313b2ea6, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@623a8092, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@157853da, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizerFactory$Customizer@306cf3ea], resourceBasePath = 'src/main/webapp', contextLoader = 'org.springframework.boot.test.context.SpringBootContextLoader', parent = [null]]] 2025-08-28 10:06:27.965 DEBUG 24804 --- [ main] org.springframework.test.context.cache : Spring test ApplicationContext cache statistics: [DefaultContextCache@41058886 size = 1, maxSize = 32, parentContextCount = 0, hitCount = 12, missCount = 1] 2025-08-28 10:06:27.965 DEBUG 24804 --- [ main] tractDirtiesContextTestExecutionListener : After test class: context [DefaultTestContext@4758820d testClass = SyncBmsDataTestServicess, testInstance = [null], testMethod = [null], testException = [null], mergedContextConfiguration = [WebMergedContextConfiguration@74eb909f testClass = SyncBmsDataTestServicess, locations = '{}', classes = '{class com.depower.DepowerApplication}', contextInitializerClasses = '[]', activeProfiles = '{}', propertySourceLocations = '{}', propertySourceProperties = '{org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true}', contextCustomizers = set[org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@313b2ea6, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@623a8092, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@157853da, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizerFactory$Customizer@306cf3ea], resourceBasePath = 'src/main/webapp', contextLoader = 'org.springframework.boot.test.context.SpringBootContextLoader', parent = [null]], attributes = map['org.springframework.test.context.web.ServletTestExecutionListener.activateListener' -> true, 'org.springframework.test.context.support.DependencyInjectionTestExecutionListener.reinjectDependencies' -> true]], class annotated with @DirtiesContext [false] with mode [null]. 2025-08-28 10:06:27.972 DEBUG 24804 --- [extShutdownHook] o.s.c.support.DefaultLifecycleProcessor : Stopping beans in phase 2147483647 2025-08-28 10:06:27.972 DEBUG 24804 --- [extShutdownHook] o.s.c.support.DefaultLifecycleProcessor : Bean 'documentationPluginsBootstrapper' completed its stop procedure 2025-08-28 10:06:27.974 INFO 24804 --- [extShutdownHook] o.s.s.c.ThreadPoolTaskScheduler : Shutting down ExecutorService 'taskScheduler' 2025-08-28 10:06:27.975 DEBUG 24804 --- [extShutdownHook] o.s.d.r.l.RedisMessageListenerContainer : Stopped RedisMessageListenerContainer 2025-08-28 10:06:27.975 INFO 24804 --- [extShutdownHook] o.s.s.concurrent.ThreadPoolTaskExecutor : Shutting down ExecutorService 'applicationTaskExecutor' 2025-08-28 10:06:27.980 INFO 24804 --- [extShutdownHook] o.s.s.quartz.SchedulerFactoryBean : Shutting down Quartz Scheduler 2025-08-28 10:06:27.980 INFO 24804 --- [extShutdownHook] org.quartz.core.QuartzScheduler : Scheduler DepowerScheduler_$_D213791756346770213 shutting down. 2025-08-28 10:06:27.980 INFO 24804 --- [extShutdownHook] org.quartz.core.QuartzScheduler : Scheduler DepowerScheduler_$_D213791756346770213 paused. 2025-08-28 10:06:27.981 DEBUG 24804 --- [extShutdownHook] org.quartz.simpl.SimpleThreadPool : Shutting down threadpool... 2025-08-28 10:06:27.981 DEBUG 24804 --- [extShutdownHook] org.quartz.simpl.SimpleThreadPool : Shutdown of threadpool complete. 2025-08-28 10:06:27.981 DEBUG 24804 --- [extShutdownHook] o.s.s.quartz.LocalDataSourceJobStore : JobStore background threads shutdown. 2025-08-28 10:06:27.981 INFO 24804 --- [extShutdownHook] org.quartz.core.QuartzScheduler : Scheduler DepowerScheduler_$_D213791756346770213 shutdown complete. 2025-08-28 10:06:27.987 DEBUG 24804 --- [extShutdownHook] io.lettuce.core.RedisClient : Initiate shutdown (100, 100, MILLISECONDS) 2025-08-28 10:06:27.995 DEBUG 24804 --- [extShutdownHook] i.l.c.resource.DefaultClientResources : Initiate shutdown (0, 2, SECONDS) 2025-08-28 10:06:27.996 DEBUG 24804 --- [extShutdownHook] i.l.c.r.DefaultEventLoopGroupProvider : Initiate shutdown (0, 2, SECONDS) 2025-08-28 10:06:28.005 DEBUG 24804 --- [extShutdownHook] o.a.s.spring.LifecycleBeanPostProcessor : Destroying bean [securityManager]... 2025-08-28 10:06:28.015 DEBUG 24804 --- [eduler_Worker-5] org.quartz.simpl.SimpleThreadPool : WorkerThread is shut down. 2025-08-28 10:06:28.015 DEBUG 24804 --- [eduler_Worker-3] org.quartz.simpl.SimpleThreadPool : WorkerThread is shut down. 2025-08-28 10:06:28.015 DEBUG 24804 --- [eduler_Worker-7] org.quartz.simpl.SimpleThreadPool : WorkerThread is shut down.
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这个aop拦截的是ServiceImpl的一个方法，然后这个ServiceImpl又启动了事务管理，而事务管理又是基于AOP的。 也就是说，这个权限的@Around的切面拦截的是个代理对象的方法，而代理对象的方法是不会把原来父类中的方法的注解加上去的，所以这里这个注解的对象为null。 private String getOperationOfTheAnnotation(Proceeding...
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weixin_42376589的博客
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如果存在注解，则java.lang.reflect.AccessibleObject.getAnnotation(Class annotationClass)方法返回此元素的指定类型的注解，否则返回null。声明以下是java.lang.reflect.AccessibleObject.getAnnotation(Class annotationClass)方法的声明。public T getA...
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zhangxucumt的博客
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定义一个注解： @Target(ElementType.TYPE)//作用于类上的注解 public @interface pro { String classname(); String methodname(); } 测试这个注解 @pro(classname = "com.zxinform.demo1",methodname = "show")//给注解里面的属性赋值 public class testAnno { public static void main(Strin
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yshen99的博客
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工作中实际遇到，此处 ignoreToken 始终取不到值，一直为null，找了好久，最后问题出在webmvc的配置上 对比一下，换成 extends WebMvcConfigurationSupport 拦截器问题解决， 具体问题没有深究，应该出来sprngboot的版本问题上 我目前使用的版本 <parent> <groupId>org.springframework.boot</groupId> <art...
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我们不生产任何代码 只做代码的搬运工
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java.lang.Package.getAnnotation(Class annotationClass) 方法返回这个元素的注解指定类型，如果这样的注释，否则返回null。 声明 以下是java.lang.Package.getAnnotation()方法的声明 public A extends Annotation> A getAnnotation(ClassA> an
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