求助ssh整合遇到的问题

HTTP Status 500 - Unable to instantiate Action, com.songbrid.controller.ShoppingCartAction, defined for 'cartListAction' in namespace '/'Error creating bean with name 'com.songbrid.controller.ShoppingCartAction': Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.songbrid.controller.ShoppingCartAction]: Constructor threw exception; nested exception is java.lang.NullPointerException

type Exception report

message Unable to instantiate Action, com.songbrid.controller.ShoppingCartAction, defined for 'cartListAction' in namespace '/'Error creating bean with name 'com.songbrid.controller.ShoppingCartAction': Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.songbrid.controller.ShoppingCartAction]: Constructor threw exception; nested exception is java.lang.NullPointerException

description The server encountered an internal error that prevented it from fulfilling this request.

exception

Unable to instantiate Action, com.songbrid.controller.ShoppingCartAction,  defined for 'cartListAction' in namespace '/'Error creating bean with name 'com.songbrid.controller.ShoppingCartAction': Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.songbrid.controller.ShoppingCartAction]: Constructor threw exception; nested exception is java.lang.NullPointerExceptioncom.opensymphony.xwork2.DefaultActionInvocation.createAction(DefaultActionInvocation.java:318)com.opensymphony.xwork2.DefaultActionInvocation.init(DefaultActionInvocation.java:399)com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:198)org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:61)org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:475)org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)

root cause

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.songbrid.controller.ShoppingCartAction': Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.songbrid.controller.ShoppingCartAction]: Constructor threw exception; nested exception is java.lang.NullPointerExceptionorg.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:288)org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1035)org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowire(AbstractAutowireCapableBeanFactory.java:339)com.opensymphony.xwork2.spring.SpringObjectFactory.buildBean(SpringObjectFactory.java:169)com.opensymphony.xwork2.spring.SpringObjectFactory.buildBean(SpringObjectFactory.java:144)com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:150)com.opensymphony.xwork2.ObjectFactory.buildAction(ObjectFactory.java:120)com.opensymphony.xwork2.DefaultActionInvocation.createAction(DefaultActionInvocation.java:299)com.opensymphony.xwork2.DefaultActionInvocation.init(DefaultActionInvocation.java:399)com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:198)org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:61)org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:475)org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)

root cause

org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.songbrid.controller.ShoppingCartAction]: Constructor threw exception; nested exception is java.lang.NullPointerExceptionorg.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:162)org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:110)org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:280)org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1035)org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowire(AbstractAutowireCapableBeanFactory.java:339)com.opensymphony.xwork2.spring.SpringObjectFactory.buildBean(SpringObjectFactory.java:169)com.opensymphony.xwork2.spring.SpringObjectFactory.buildBean(SpringObjectFactory.java:144)com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:150)com.opensymphony.xwork2.ObjectFactory.buildAction(ObjectFactory.java:120)com.opensymphony.xwork2.DefaultActionInvocation.createAction(DefaultActionInvocation.java:299)com.opensymphony.xwork2.DefaultActionInvocation.init(DefaultActionInvocation.java:399)com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:198)org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:61)org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:475)org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)

root cause

java.lang.NullPointerExceptioncom.songbrid.controller.ShoppingCartAction.init(ShoppingCartAction.java:106)com.songbrid.controller.ShoppingCartAction.<init>(ShoppingCartAction.java:30)sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)java.lang.reflect.Constructor.newInstance(Constructor.java:423)org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:147)org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:110)org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:280)org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1035)org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowire(AbstractAutowireCapableBeanFactory.java:339)com.opensymphony.xwork2.spring.SpringObjectFactory.buildBean(SpringObjectFactory.java:169)com.opensymphony.xwork2.spring.SpringObjectFactory.buildBean(SpringObjectFactory.java:144)com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:150)com.opensymphony.xwork2.ObjectFactory.buildAction(ObjectFactory.java:120)com.opensymphony.xwork2.DefaultActionInvocation.createAction(DefaultActionInvocation.java:299)com.opensymphony.xwork2.DefaultActionInvocation.init(DefaultActionInvocation.java:399)com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:198)org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:61)org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:475)org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)

note The full stack trace of the root cause is available in the Apache Tomcat/8.0.46 logs.