我的日常報錯學習記錄（1）
阿新 • • 發佈：2019-01-11
專案中遇到此錯誤，極其簡單，但還是找了很久不知道怎麼解決，搜查結果都是說是bean配置等錯，無法解決我的錯誤，現貼出錯誤程式碼如下：
1 org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'filePController': Failed to introspect bean class [com.scd.emails.controller.FilePController] for lookup method metadata: could not find classView Codethat it depends on; nested exception is java.lang.NoClassDefFoundError: org/json/JSONObject 2 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors(AutowiredAnnotationBeanPostProcessor.java:269) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]3 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineConstructorsFromBeanPostProcessors(AbstractAutowireCapableBeanFactory.java:1118) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE] 4 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1091) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]5 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE] 6 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE] 7 at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE] 8 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE] 9 at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE] 10 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE] 11 at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE] 12 at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE] 13 at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE] 14 at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE] 15 at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE] 16 at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE] 17 at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE] 18 at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE] 19 at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE] 20 at com.scd.emails.SendEmailsApplication.main(SendEmailsApplication.java:17) [classes/:na] 21 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_144] 22 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_144] 23 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_144] 24 at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_144] 25 at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-1.5.8.RELEASE.jar:1.5.8.RELEASE] 26 Caused by: java.lang.NoClassDefFoundError: org/json/JSONObject 27 at java.lang.Class.getDeclaredMethods0(Native Method) ~[na:1.8.0_144] 28 at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) ~[na:1.8.0_144] 29 at java.lang.Class.getDeclaredMethods(Class.java:1975) ~[na:1.8.0_144] 30 at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:613) ~[spring-core-4.3.12.RELEASE.jar:4.3.12.RELEASE] 31 at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:524) ~[spring-core-4.3.12.RELEASE.jar:4.3.12.RELEASE] 32 at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:510) ~[spring-core-4.3.12.RELEASE.jar:4.3.12.RELEASE] 33 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors(AutowiredAnnotationBeanPostProcessor.java:247) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE] 34 ... 23 common frames omitted 35 Caused by: java.lang.ClassNotFoundException: org.json.JSONObject 36 at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_144] 37 at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_144] 38 at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335) ~[na:1.8.0_144] 39 at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_144] 40 at org.springframework.boot.devtools.restart.classloader.RestartClassLoader.loadClass(RestartClassLoader.java:151) ~[spring-boot-devtools-1.5.8.RELEASE.jar:1.5.8.RELEASE] 41 at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_144] 42 ... 30 common frames omitted
解決方法：
因為寫程式碼時eclipse提示新增異常，再次開啟之後，報以上錯誤，因此刪去異常throws JSONException
不要忘記刪導進去的包
刪除完畢之後，我發現還是報錯，最後發現匯入的json包是錯的，這才是真正的錯誤所在嗎？？
刪掉，重新匯入：
之後不再報錯，完美解決，儲存即可。