Caused by: java.lang.VerifyError: Cannot inherit from final class

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本文记录了在引入多个测试客户端包后，运行测试案例时出现的 Spring Bean 创建失败错误，并详细描述了排查过程及最终解决方案。

背景：引入多个测试的client包后，运行TC时，报错：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'aeProductPostPropertyCacheDao' defined in URL [jar:file:/Users/jinyun/.m2/repository/com/aliexpress/category/open.aecategory.pyramidclient/1.0.38-SNAPSHOT/open.aecategory.pyramidclient-1.0.38-20171219.162546-8.jar!/biz/spring/spring_py_client_dal.xml]: Initialization of bean failed; nested exception is java.lang.VerifyError: Cannot inherit from final class
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:480)
	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:222)
	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.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:254)
	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)
	... 43 more
Caused by: java.lang.VerifyError: Cannot inherit from final class
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:425)

排查过程：

1）确定aeProductPostPropertyCacheDao 没有继承final的方法；

2）怀疑是类冲突导致，全局搜索aeProductPostPropertyCacheDao，仅找到一个实现类

3）gogle发现有人有同样问题，继续排查是否有重复的包依赖。最后，将提报的测试包，依次删除，仅留单个包时，TC运行通过。

确认是冲突导致的。

后打印依赖树，确实果然有重复依赖。

解决方式：

1）根据依赖树，原来提报的修改过的二方包有7个，这样在pom中只引入2个二方包即可，其余的已通过这2个包间接引入。

遗留问题：

1）既然有冲突，为什么，全局搜索的时候，仅搜到了一个aeProductPostPropertyCacheDao类；

2）发生的具体原理见下方参考

查了很多参考文献，最后根据这个解决：https://stackoverflow.com/questions/40829949/java-lang-verifyerror-cannot-inherit-from-final-class-when-using-spring-boot-da