请教一个问题,困扰我5天了。
使用this.getHibernateTemplate()后DEGUB getHibernateTemplate()为NULL,报java.lang.NullPointerException错误
以下是我的web,xml配置:
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>
<servlet>
<servlet-name>action</servlet-name>
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
</init-param>
<init-param>
<param-name>debug</param-name>
<param-value>3</param-value>
</init-param>
<init-param>
<param-name>detail</param-name>
<param-value>3</param-value>
</init-param>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>/index1.jsp</welcome-file>
</welcome-file-list>
<jsp-config>
<taglib>
<taglib-uri>/WEB-INF/struts-html.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-html.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-logic.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-bean.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
</taglib>
</jsp-config>
<login-config>
<auth-method>BASIC</auth-method>
</login-config>
</web-app>这是我的applicationContext配置:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean name="/manage/checklogin" class="com.skvia.login.Action.LoginAction">
</bean> <bean id="dataSource"
class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName"><value>com.mysql.jdbc.Driver</value>
</property>
<property name="url"><value>jdbc:mysql://localhost:3306/skvia</value>
</property>
<property name="username"><value>root</value></property>
<property name="password"><value>123456</value></property>
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource">
<ref bean="dataSource" />
</property>
<property name="mappingResources">
<list>
<value>com/skvia/login/loginmodel/UserInfo.hbm.xml</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">
org.hibernate.dialect.MySQLDialect
</prop>
</props>
</property>
</bean>
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>
<!-- 用户数据访问对象 -->
<bean id="logincheck" class="com.skvia.login.personImpl.PersonDAOImpl">
<property name="hibernateTemplate" ref="hibernateTemplate"/>
</bean>
</beans>
这是我的PersonDAOImpl代码
public class PersonDAOImpl extends HibernateDaoSupport implements PersonDAO{
//通过用户名查询单个用户
public List checklogin(UserInfo userinfo) throws DataAccessException {
String HQL = "FROM UserInfo where username = ?";
Object[] object = new Object[1];
String name = userinfo.getUsername();
object[0] = name;
List list = this.getHibernateTemplate().find(HQL, object);
return list;
}
}请教大家哪错了,,,,,十分感谢
使用this.getHibernateTemplate()后DEGUB getHibernateTemplate()为NULL,报java.lang.NullPointerException错误
以下是我的web,xml配置:
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>
<servlet>
<servlet-name>action</servlet-name>
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
</init-param>
<init-param>
<param-name>debug</param-name>
<param-value>3</param-value>
</init-param>
<init-param>
<param-name>detail</param-name>
<param-value>3</param-value>
</init-param>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>/index1.jsp</welcome-file>
</welcome-file-list>
<jsp-config>
<taglib>
<taglib-uri>/WEB-INF/struts-html.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-html.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-logic.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-bean.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
</taglib>
</jsp-config>
<login-config>
<auth-method>BASIC</auth-method>
</login-config>
</web-app>这是我的applicationContext配置:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean name="/manage/checklogin" class="com.skvia.login.Action.LoginAction">
</bean> <bean id="dataSource"
class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName"><value>com.mysql.jdbc.Driver</value>
</property>
<property name="url"><value>jdbc:mysql://localhost:3306/skvia</value>
</property>
<property name="username"><value>root</value></property>
<property name="password"><value>123456</value></property>
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource">
<ref bean="dataSource" />
</property>
<property name="mappingResources">
<list>
<value>com/skvia/login/loginmodel/UserInfo.hbm.xml</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">
org.hibernate.dialect.MySQLDialect
</prop>
</props>
</property>
</bean>
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>
<!-- 用户数据访问对象 -->
<bean id="logincheck" class="com.skvia.login.personImpl.PersonDAOImpl">
<property name="hibernateTemplate" ref="hibernateTemplate"/>
</bean>
</beans>
这是我的PersonDAOImpl代码
public class PersonDAOImpl extends HibernateDaoSupport implements PersonDAO{
//通过用户名查询单个用户
public List checklogin(UserInfo userinfo) throws DataAccessException {
String HQL = "FROM UserInfo where username = ?";
Object[] object = new Object[1];
String name = userinfo.getUsername();
object[0] = name;
List list = this.getHibernateTemplate().find(HQL, object);
return list;
}
}请教大家哪错了,,,,,十分感谢
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ApplicationContext ctx = new ClassPathXmlApplicationContext(
"applicationContext.xml");
HibernateTemplate ht= (HibernateTemplate) ctx.getBean("hibernateTemplate");
看看,能否获得,如果不行,就是配置的问题啦
用以下代码成功了:
String HQL = "FROM UserInfo where username = ?";
Object[] object = new Object[1];
String name = userinfo.getUsername();
object[0] = name;
ApplicationContext ctx = new ClassPathXmlApplicationContext("file:D:/Program Files/Apache Software Foundation/Tomcat 6.0/webapps/Skvia/WEB-INF/applicationContext.xml");
HibernateTemplate ht= (HibernateTemplate) ctx.getBean("hibernateTemplate");
List list = ht.find(HQL, object);
return list;
请帮我分析一下,问题出在哪里?
感谢,,
我刚用PersonDAOImpl pb = (PersonDAOImpl) ctx.getBean("logincheck");
List list = pb.getHibernateTemplate().find(HQL, object);
也能够实现,为什么用this.getHibernateTemplate().find(HQL, object);不行呢
<property name="sessionFactory" ref="sessionFactory"> </property>
</bean>
<!-- 用户数据访问对象 -->
<bean id="logincheck" class="com.skvia.login.personImpl.PersonDAOImpl">
<property name="hibernateTemplate" ref="hibernateTemplate"/>
</bean>
</beans> 这里配置有问题吧!直接下面的就可以了
<bean id="logincheck" class="com.skvia.login.personImpl.PersonDAOImpl">
<property name="sessionFactory" ref="sessionFactory"> </property>
</bean>
</beans>
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource">
<ref bean="dataSource" />
</property> <!--加上-->
<property name="mappingDirectoryLocations">
<value>pojo的hbm.xml</value>
</property>
<!-- --></bean>