ssh项目在Action中实例化的Biz对象为null，找不到Biz报空指针异常

解决办法

1。可能是在action和biz中没写set方法

 private NewsBiz  newsBiz;
    public void setNewsBiz(NewsBiz newsBiz) {
        this.newsBiz = newsBiz;
    }

 private NewsDao newsDao;

    public void setNewsDao(NewsDao newsDao) {
        this.newsDao = newsDao;
    }

 

2。applicationContext中没配置

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="configurationClass" value="org.hibernate.cfg.AnnotationConfiguration" />
        <property name="configLocation" value="classpath:hibernate.cfg.xml" />

        <property name="mappingResources">
            <list>
                <value>com/accp/pojo/News.hbm.xml</value>
                <value>com/accp/pojo/Vacation.hbm.xml</value>
                <value>com/accp/pojo/ExceptionOrder.hbm.xml</value>
            </list>
        </property>
    </bean>

<!-- News dao -->
    <bean id="NewsDaoImpl" class="com.accp.dao.impl.NewsDaoImpl">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>

    <!-- biz -->
    <bean id="NewsBizImpl" class="com.accp.biz.impl.NewsBizImpl">
        <property name="newsDao" ref="NewsDaoImpl" />
    </bean>

    <!-- action -->
    <bean id="NewsAction" class="com.accp.action.NewsAction" scope="prototype">
        <property name="newsBiz" ref="NewsBizImpl" />
    </bean>

3.status中class写了全路径

错误代码

        <action name="new*" class="com.accp.action.NewsAction" method="{1}">
            <result name="selectFirstPage">/news.jsp</result>
            <result name="selectNextPage">/news.jsp</result>
            <result name="newsupdate" type="redirectAction">newselectFirstPage</result>
            <result name="add" type="redirectAction">newselectFirstPage</result>
            <result name="delete" type="redirectAction">newselectFirstPage</result>
            <result name="updatejsp">/news_update.jsp</result>
            <result name="error">/error.jsp</result>
        </action>

 

正确代码

    <!--selectFirstPage-->
        <action name="new*" class="NewsAction" method="{1}">
            <result name="selectFirstPage">/news.jsp</result>
            <result name="selectNextPage">/news.jsp</result>
            <result name="newsupdate" type="redirectAction">newselectFirstPage</result>
            <result name="add" type="redirectAction">newselectFirstPage</result>
            <result name="delete" type="redirectAction">newselectFirstPage</result>
            <result name="updatejsp">/news_update.jsp</result>
            <result name="error">/error.jsp</result>
        </action>