项目启动时报错Instantiation of bean failed; nested exception is java.lang.ExceptionInInitializerError

Posted 2020-10-16 我们的问题主要是读书不多而想得太多

问题详细：

启动项目时，报错：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘searchIPAttributionService‘ defined in file [***\service\SearchIPAttributionService.class]: 
Instantiation of bean failed; nested exception is java.lang.ExceptionInInitializerError
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1013)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:959)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:490)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:461)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:295)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:626)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
	at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:651)
	at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:599)
	at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:665)
	at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:518)
	at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:459)
	at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
	at javax.servlet.GenericServlet.init(GenericServlet.java:158)
	at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1284)
	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1197)
	at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1087)
	at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5266)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5554)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1263)
	at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1948)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.ExceptionInInitializerError
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
	at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:148)
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:87)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1006)
	... 33 more
Caused by: java.lang.NullPointerException
	at ***.service.SearchIPAttributionService.load(SearchIPAttributionService.java:133)
	at ***.service.SearchIPAttributionService.load(SearchIPAttributionService.java:66)
	at ***.service.SearchIPAttributionService.<clinit>(SearchIPAttributionService.java:28)
	... 40 more

 

解决过程：

1、检查配置，反反复复看了很多遍，确认没有问题。

2、 网上找了很多资料，类似的问题很多，看过答案以后依旧不得其要领。只好继续看报错代码，直到看到这一句：

Caused by: java.lang.NullPointerException
	at ***.service.SearchIPAttributionService.load(SearchIPAttributionService.java:133)
	at ***.service.SearchIPAttributionService.load(SearchIPAttributionService.java:66)
	at ***.service.SearchIPAttributionService.<clinit>(SearchIPAttributionService.java:28)

 问题应该在本身的代码上，但是，我记得代码是测试过的，没有问题。但是，没有其他办法，只能顺着提示一步步寻找问题所在。最终，确实问题出在代码上。Spring在实例化这个类的时候，先执行静态方法时，某个类还未实例化，故而报了这个空指针错误。

经验教训：

1、解决问题，不要急躁，要淡定，淡定，淡定。

2、仔细看报错信息。

3、每次修改过代码以后，都要记得进行测试，确保修改是正确的。