SSH项目整合——XML文档流
发布时间：2020-12-16 09:09:27 所属栏目：百科 来源：网络整理
导读：?? 编程中总会遇到头疼的问题，各种莫名奇妙的错误，这个错误调试了一下午，终于在老师的帮助下解决了。 错误信息： org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'loginBean' defined in ServletContext resou
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编程中总会遇到头疼的问题，各种莫名奇妙的错误，这个错误调试了一下午，终于在老师的帮助下解决了。
错误信息： org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'loginBean' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Cannot resolve reference to bean 'userDAo' while setting bean property 'userDAO'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userDAo' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Cannot resolve reference to bean 'dataSource' while setting bean property 'dataSource'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.aop.aspectj.AspectJPointcutAdvisor': Cannot resolve reference to bean 'txAdvice' while setting bean property 'advice'; 这个错误竟然是因为ApplicationContext.xml文件中bean标签的顺序问题，将自己的bean定义放在了sessionFactory的bean的上面，而XML文档流是由上向下寻找节点的，hibernate是先建立sessionFactory，再由sessionFactory实例化其他bean，所以自己的bean定义要放在sessionFactory定义的下面，才能正确实例化。 例： Appli <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" xsi:schemaLocation=" http://www.springframework.org/schema/beans; classpath:org/springframework/beans/factory/xml/spring-beans.xsd http://www.springframework.org/schema/aop; classpath:org/springframework/aop/config/spring-aop.xsd http://www.springframework.org/schema/tx classpath:org/springframework/transaction/config/spring-tx.xsd"> <!-- 定义数据源 --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <!-- 指定连接数据库的JDBC驱动 --> <property name="driverClass" value="com.mysql.jdbc.Driver"> </property> <!-- 连接数据库所用的URL --> <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/user?useUnicode=true&characterEncoding=utf-8"> </property> <!-- 连接数据库的用户名 --> <property name="user" value="root"> </property> <!-- 连接数据库的密码 --> <property name="password" value="root"> </property> <!-- 设置数据库连接池的最大连接数 --> <property name="maxPoolSize" value="20"> </property> <!-- 设置数据库连接池的最小连接数 --> <property name="minPoolSize" value="2"> </property> <!-- 设置数据库连接池的初始化连接数 --> <property name="initialPoolSize" value="2"> </property> <!-- 设置数据库连接池的连接的最大空闲时间,单位为秒 --> <property name="maxIdleTime" value="20"> </property> </bean> <!-- 定义sessionFactory --> <bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"> <property name="dataSource"> <ref bean="dataSource" /> </property> <!-- 配置hibernate实体映射关系 --> <property name="annotatedClasses"> <list> <value>com.freedom.bean.User</value> </list> </property> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop> <prop key="hibernate.show_sql">true</prop> <prop key="hibernate.format_sql">true</prop> <prop key="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</prop> <!--<prop key="hibernate.cache.use_second_level_cache">false</prop> <prop key="hibernate.cache.use_structured_entries">false</prop> <prop key="hibernate.jdbc.use_scrollable_resultset">true</prop>--> <prop key="hibernate.cache.use_query_cache">false</prop> </props> </property> <!--hibernate search配置--> <!-- <property name="eventListeners"> <map> <entry key="post-update"> <bean class="org.hibernate.search.event.FullTextIndexEventListener"/> </entry> <entry key="post-insert"> <bean class="org.hibernate.search.event.FullTextIndexEventListener"/> </entry> <entry key="post-delete"> <bean class="org.hibernate.search.event.FullTextIndexEventListener"/> </entry> </map> </property> --> </bean> <!-- 定义数据源 end --> <!-- 定义事务 --> <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"> <property name="sessionFactory"> <ref bean="sessionFactory" /> </property> </bean> <!-- 定义事务 end --> <!--bean的定义要放在SessionFactory的下面 --> <bean id="loginBean" class="com.freedom.action.LoginAction"> <property name="userDAO" ref="userDAo"></property> </bean> <bean id="userDAo" class="com.freedom.dao.UserDao"> <property name="sessionFactory" ref="sessionFactory" /> </bean> <!-- 配置spring事务特性，配置add,delete,update开始的方法，事务传播特性为required --> <tx:advice id="txAdvice" transaction-manager="transactionManager"> <tx:attributes> <tx:method name="add*" propagation="REQUIRED"/> <tx:method name="delete*" propagation="REQUIRED"/> <tx:method name="update*" propagation="REQUIRED"/> <!-- <tx:method name="*" propagation="REQUIRED" /> --> </tx:attributes> </tx:advice> <!-- 配置哪些类的方法行进事务管理，当前com.model包中的子包,类中所有方法需要，还需要参考tx:advice的设置 --> <aop:config> <aop:pointcut id="interceptorPointCuts" expression="execution(* com.freedom.dao.*.*(..))" /> <aop:advisor advice-ref="txAdvice" pointcut-ref="interceptorPointCuts" /> </aop:config> </beans> （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |