报错情况
1月 08, 2021 6:14:16 下午 org.springframework.context.support.AbstractApplicationContext refresh
警告: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [beanPostProcessorExample] for bean with name 'helloWorld' defined in class path resource [Beans.xml]; nested exception is java.lang.ClassNotFoundException: beanPostProcessorExample
Exception in thread "main" org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [beanPostProcessorExample] for bean with name 'helloWorld' defined in class path resource [Beans.xml]; nested exception is java.lang.ClassNotFoundException: beanPostProcessorExample
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1382)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineTargetType(AbstractAutowireCapableBeanFactory.java:663)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:630)
at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1491)
at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1014)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:828)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:865)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:548)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:144)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:85)
at beanPostProcessorExample.MainApp.main(MainApp.java:7)
Caused by: java.lang.ClassNotFoundException: beanPostProcessorExample
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:606)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:168)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
at org.springframework.util.ClassUtils.forName(ClassUtils.java:275)
at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:437)
at org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1430)
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1374)
... 10 more
工程文件
错误原因
在看到报错信息中
java.lang.ClassNotFoundException: beanPostProcessorExample
我查看了所有用到该包的代码，最后发现Beans.xml中的class属性缺失类名
于是我补充了类名
运行成功！
结论：查看错误信息内造成原因（Caused by ...），如果是缺失类，可以查看所有用到类的代码，添加即可。