org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userAction'

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在SSH中一个常见的Action创建异常，当启动Tomcat时：
严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListenerorg.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userAction' defined in class path resource [applicationContext.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.mstf.action.UserAction]: Constructor threw exception; nested exception is java.lang.NullPointerException    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:965)    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:911)    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:485)    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:580)    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895)    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425)    at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:276)    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:197)    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3827)    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4334)    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)    at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:920)    at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:883)    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)    at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1138)    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)    at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)    at org.apache.catalina.core.StandardService.start(StandardService.java:516)    at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)    at org.apache.catalina.startup.Catalina.start(Catalina.java:566)    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)    at java.lang.reflect.Method.invoke(Method.java:606)    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)Caused by: org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.mstf.action.UserAction]: Constructor threw exception; nested exception is java.lang.NullPointerException    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:141)    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:74)    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:958)    ... 37 moreCaused by: java.lang.NullPointerException    at org.apache.struts2.ServletActionContext.getResponse(ServletActionContext.java:130)    at com.mstf.action.BaseAction.getResponse(BaseAction.java:42)    at com.mstf.action.BaseAction.getWrite(BaseAction.java:56)    at com.mstf.action.UserAction.<init>(UserAction.java:86)    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:126)    ... 39 more
常见的原因是因为在初始化的构造方法中（Action方法之外），当服务一启动就执行了关于HttpServlet的方法，只要删除即可
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