SpringBoots这个显示错误是哪个地方有问题，刚学照不出来

2021-04-07 05:04:16 304 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

手把手教你解决knife4j在SpringBoot中的404问题：从排查到修复全流程本文详细解析了在SpringBoot项目中集成knife4j时遇到的404问题，特别是访问doc.html页面时的常见错误。通过分析WebMvcConfigurationSupport的影响、静态资源路径配置等五大诱因，提供了四种实用解决方案，帮助开发者快速修复问题并优化knife4j的使用体验。阅读详情

警告: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'key' defined in class path resource [applicationContext.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [cn.edu.qztc.software20.KeyBoard]: No default constructor found; nested exception is java.lang.NoSuchMethodException: cn.edu.qztc.software20.KeyBoard.<init>()
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'key' defined in class path resource [applicationContext.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [cn.edu.qztc.software20.KeyBoard]: No default constructor found; nested exception is java.lang.NoSuchMethodException: cn.edu.qztc.software20.KeyBoard.<init>()
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1155)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1099)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at cn.edu.qztc.software20.TestIOC.main(TestIOC.java:12)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [cn.edu.qztc.software20.KeyBoard]: No default constructor found; nested exception is java.lang.NoSuchMethodException: cn.edu.qztc.software20.KeyBoard.<init>()
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:85)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1147)
... 13 more
Caused by: java.lang.NoSuchMethodException: cn.edu.qztc.software20.KeyBoard.<init>()
at java.lang.Class.getConstructor0(Unknown Source)
at java.lang.Class.getDeclaredConstructor(Unknown Source)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:80)
... 14 more