由于无法创建bean而获得空指针异常

Question

 <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" default-autowire="byName" xmlns:oxm="http://www.springframework.org/schema/oxm" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/oxm http://www.springframework.org/schema/oxm/spring-oxm-4.3.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd"> <bean id="userRoleDAOTarget" class="com.revguru.crs.security.dao.UserRoleDAOImpl" scope="prototype"> <property name="sessionFactory" ref="hsdSessionFactory" /> </bean> <bean id="userAuthDAOTarget" class="com.revguru.crs.security.dao.AuthenticationDAOImpl" scope="prototype"> <property name="sessionFactory" ref="hsdSessionFactory" /> </bean> <bean id="hotelUserDAOTarget" class="com.revguru.crs.security.dao.HotelUserDAOImpl" scope="prototype"> <property name="sessionFactory" ref="hsdSessionFactory" /> </bean> <bean id="userRoleDataObjprocessor" class="com.revguru.crs.security.service.UserRoleProcessor" scope="prototype"> <property name="userRoleDAO" ref="hsdSecurityObjectDAO" /> </bean> <bean id="userAuthDataObjprocessor" class="com.revguru.crs.security.service.AuthenticationProcessor" scope="prototype"> <property name="authenticationDAO" ref="hsdSecurityAuthObjectDAO" /> <property name="messages" ref="userSectionMessageSource"/> </bean> <bean id="hotelUserDataObjProcessor" class="com.revguru.crs.security.service.HotelUserProcessor" scope="prototype"> <property name="hotelUserDAO" ref="hsdHotelUserDAO" /> <property name="securitySectionLogger" ref="generalServiceLogger"/> </bean> <bean id="SECURITY_SERVICE" class="com.revguru.crs.core.service.sc.SecurityService" scope="prototype"> <property name="userRoleProcessor" ref="userRoleDataObjprocessor" /> <property name="userAuthProcessor" ref="userAuthDataObjprocessor" /> <property name="hotelUserProcessor" ref="hotelUserDataObjProcessor" /> </bean> <bean id="hsdSecurityObjectDAO" class="org.springframework.aop.framework.ProxyFactoryBean"> <property name="proxyInterfaces"> <value>com.revguru.crs.security.dao.UserRoleDAO </value> </property> <property name="interceptorNames"> <list> <value>hibernateInterceptor</value> <value>userRoleDAOTarget</value> </list> </property> </bean> <bean id="hsdSecurityAuthObjectDAO" class="org.springframework.aop.framework.ProxyFactoryBean"> <property name="proxyInterfaces"> <value>com.revguru.crs.security.dao.AuthenticationDAO </value> </property> <property name="interceptorNames"> <list> <value>hibernateInterceptor</value> <value>userAuthDAOTarget</value> </list> </property> </bean> <bean id="hsdHotelUserDAO" class="org.springframework.aop.framework.ProxyFactoryBean"> <property name="proxyInterfaces"> <value>com.revguru.crs.security.dao.HotelUserDAO </value> </property> <property name="interceptorNames"> <list> <value>hibernateInterceptor</value> <value>hotelUserDAOTarget</value> </list> </property> </bean> <bean id="userSectionMessageSource" class="org.springframework.context.support.ResourceBundleMessageSource" scope="prototype"> <property name="alwaysUseMessageFormat" value="true"/> <property name="basenames"> <list> <value>userauthResources/hsd_user_msg</value> </list> </property> </bean> </beans> 

这是我的bean文件，它正在引用hsdsessionFsctory，其中定义如下：

 <bean id="dataSource" destroy-method="close" class="org.apache.commons.dbcp.BasicDataSource"> <property name="driverClassName" value="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:mysql://127.0.0.1:3306/revguru"/> <property name="username" value="root" /> <property name="password" value="decoder" /> </bean> <bean id="hsdSessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="hibernateProperties"> 

当我运行我的项目时，我得到空指针异常

 public class UserLoginController { private FacesContext facesContext = FacesContext.getCurrentInstance(); HttpSession session = (HttpSession)FacesContext.getCurrentInstance().getExternalContext().getSession(true); private SecurityService securityService; public void setSecurityService(SecurityService securityService) { this.securityService = securityService; } public SecurityService getSecurityService() { return this.securityService; } /** * Authenticate the User * @return */ public String authenticate() { if(session.getAttribute("menus") != null) { session.removeAttribute("menus"); } if (session.getAttribute("CommonGlobalBean") != null) { session.removeAttribute("CommonGlobalBean"); } CommonGlobalBean commonGlobalBean = new CommonGlobalBean(); commonGlobalBean.setTimeZone(TimeZone.getDefault().getID()); UserLogin userLogin =(UserLogin)session.getAttribute("UserLogin"); String username = userLogin.getUserName(); String password = userLogin.getPassword(); UserInformation userInformation = null; System.out.println("security serv ice is "); if(securityService==null){ System.out.println("security serv ice is null:"); securityService= new SecurityService(); } if (userLogin != null) { System.out.println("username is:"+username); System.out.println("password is:"+password); if (securityService.authenticate(username,password)) { Util.log("Get User Object by Email"); UserDataObject userDataObject = securityService.getUserObjectByEmail(userLogin.getUserName()); Util.log("User name : "+userDataObject.getUserFirstName()); userInformation = (UserInformation)session.getAttribute("UserObject"); if (userInformation != null) { session.removeAttribute("UserObject"); } userInformation = getUserInformation(userDataObject); session.setAttribute("UserObject", userInformation); if(!checkUserAsHotelRole(userInformation)) { Util.log("User does not have hotel role."); Util.reportError(facesContext, "login_user_not_valid_password", null); } HotelDataObject hotelDataObject = getAssignedHotel(userInformation); session.setAttribute("hotelDataObjectInSession", hotelDataObject); List<Menu> menus = new ArrayList<Menu>(); for (FeatureDataObject feature : userInformation.getFeatureDataObjects()) { if (feature.getParentFeatureId() == null && feature.getFeatureTypeId().getId().intValue() == HSDServiceConstants.MENU && feature.getShowFeature() == 1) { List<MenuItem> menuItems = getMenuItems(feature.getId(), userInformation.getFeatureDataObjects()); menus.add(new Menu(feature.getId(), feature.getFeatureName(), "", menuItems)); } } String languageCode = userLogin.getLanguageCode(); if (languageCode == null) { userLogin.setLanguageCode("en"); facesContext.getViewRoot().setLocale(Locale.ENGLISH); } else { if(languageCode.equals("fr")) { facesContext.getViewRoot().setLocale(Locale.FRENCH); } else { facesContext.getViewRoot().setLocale(Locale.ENGLISH); } } Util.log(":: languageCode :: " + userLogin.getLanguageCode()); session.setAttribute("menus", menus); session.setAttribute("CommonGlobalBean", commonGlobalBean); /** * get hotel general info details */ GeneralHotelController generalHotelController = new GeneralHotelController(); generalHotelController.loadGeneralInformation(); /** * return to hotel general info page */ return "generalInfo"; } else { Util.log("Invalid User."); Util.reportError(facesContext, "login_user_not_valid_password", null); } } return ""; } 

调用另一个方法进行分类如下

 public boolean authenticate(String email, String password) { log.info("Authenticating : " + email); UserDataObject user = getUserObjectByEmail(email); if (user == null) { log.info("User does not exist for email id :" + email); return false; } return checkPassword(password, user.getPassword()); } 

当我在Spring Explorer中看到它时，表明我的Bean ref是未知的

这是我的堆栈跟踪

 javax.servlet.ServletException: java.lang.NullPointerException javax.faces.webapp.FacesServlet.service(FacesServlet.java:659) io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85) io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129) org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:357) io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84) io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62) io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78) io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131) io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57) io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46) io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64) io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60) io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77) io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50) io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43) io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61) io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292) io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81) io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138) io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135) io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48) io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43) io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44) io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44) io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44) io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44) io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44) io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272) io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81) io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104) io.undertow.server.Connectors.executeRootHandler(Connectors.java:202) io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:805) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) java.lang.Thread.run(Thread.java:745) 

我的春季浏览器中的红色标记是什么

而其他人没有

Answer 1

UserLoginController没有在XML中配置为Bean（至少在您发布的XML中没有配置），因此Spring对此一无所知，也没有注入。

尝试添加此内容（当然还有完整的软件包）：

<bean id="loginController" class="com.revguru.crs.security.dao.AuthenticationDAOImpl" scope="prototype">
        <property name="securityService" ref="SECURITY_SERVICE" />
</bean>