初始化失败_Destroying singletons_destroying singletons in org.springframework.beans-优快云博客

本文链接：https://blog.youkuaiyun.com/gwpJava/article/details/30121659

博客讲述了作者在配置Spring Bean时遇到的问题，由于缺少无参构造函数导致初始化单例失败，浪费了较长时间解决这个问题。异常信息显示在尝试创建'department' bean时，依赖的'employee1' bean无法实例化，原因是找不到类com.gwp.zcc.domain.Employee的默认构造函数。

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这个错误的根源是因为我没有提供无参的构造函数靠搞得浪费了我大概三个多小时的时间。。。。啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊。。。。。。。

信息: Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1a42792: defining beans [department,employee1,employee2,employee4]; root of factory hierarchy
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'department' defined in class path resource [com/gwp/zcc/test/beans.xml]: Cannot resolve reference to bean 'employee1' while setting bean property 'empList' with key [0]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'employee1' defined in class path resource [com/gwp/zcc/test/beans.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.gwp.zcc.domain.Employee]: No default constructor found; nested exception is java.lang.NoSuchMethodException: com.gwp.zcc.domain.Employee.<init>()
   at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:275)
   at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:104)
   at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveManagedList(BeanDefinitionValueResolver.java:287)
   at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:126)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1245)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1010)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:472)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
   at java.security.AccessController.doPrivileged(Native Method)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
   at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
   at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:221)
   at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
   at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
   at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
   at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:429)
   at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:729)
   at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:381)
   at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
   at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
   at com.gwp.zcc.test.TestMain.main(TestMain.java:24)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'employee1' defined in class path resource [com/gwp/zcc/test/beans.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.gwp.zcc.domain.Employee]: No default constructor found; nested exception is java.lang.NoSuchMethodException: com.gwp.zcc.domain.Employee.<init>()
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:883)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:839)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:440)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
   at java.security.AccessController.doPrivileged(Native Method)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
   at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
   at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:221)
   at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
   at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
   at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
   at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:269)
   ... 20 more
Caused by: org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.gwp.zcc.domain.Employee]: No default constructor found; nested exception is java.lang.NoSuchMethodException: com.gwp.zcc.domain.Employee.<init>()
   at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:58)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:877)
   ... 31 more
Caused by: java.lang.NoSuchMethodException: com.gwp.zcc.domain.Employee.<init>()
   at java.lang.Class.getConstructor0(Class.java:2706)
   at java.lang.Class.getDeclaredConstructor(Class.java:1985)
   at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:54)
   ... 32 more