测试spring和Hibernate整合 空指针异常错误

Question

hibernatespring指针异常测试

Answer 1

EmployeeServiceImpl头上加注解@Service,还有你把你的beans.xml文件内容贴出来.

Answer 2

<?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:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
          http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
          http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">
 
 <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
     <property name="driverClassName" value="org.gjt.mm.mysql.Driver"/>
     <property name="url" value="jdbc:mysql://localhost:3306/bettertaste?useUnicode=true&amp;characterEncoding=UTF-8"/>
     <property name="username" value="root"/>
     <property name="password" value="root"/>
      <!-- 连接池启动时的初始值 -->
   <property name="initialSize" value="1"/>
   <!-- 连接池的最大值 -->
   <property name="maxActive" value="500"/>
   <!-- 最大空闲值.当经过一个高峰时间后，连接池可以慢慢将已经用不到的连接慢慢释放一部分，一直减少到maxIdle为止 -->
   <property name="maxIdle" value="2"/>
   <!--  最小空闲值.当空闲的连接数少于阀值时，连接池就会预申请一些连接，以避免洪峰来时再申请而造成的性能开销 -->
   <property name="minIdle" value="1"/>
   </bean>
  
   <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
      <property name="dataSource" ref="dataSource"/>
      <property name="mappingResources">
      <list>
        <value>cn/itcast/bean/Employee.hbm.xml</value>
      </list>
      </property>
      <property name="hibernateProperties">
      <value>
          hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
          hibernate.hbm2ddl.auto=update
          hibernate.show_sql=false
          hibernate.format_sql=false
          hibernate.cache.use_second_level_cache=true
                hibernate.cache.use_query_cache=false
             hibernate.cache.provider_class=org.hibernate.cache.EhCacheProvider
        </value>
     </property>
 </bean>
   <bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory"/>
   </bean>
  <!-- 采用@Transactional注解方式使用事务 -->
  <tx:annotation-driven transaction-manager="txManager"/>
</beans>@Service我加了呢~

Answer 3

你用的spring-beans-2.5啊,2.5需要手动创建配置Bean的啊!你换成3.x的吧

Answer 4

2.5支持注解的，按以下修改试试：@service("employeeDao") //这里尽量这样写
public class EmployeeDaoImpl implements EmployeeDao{}@service("employeeService") //这里尽量这样写
public class EmployeeServiceImpl implements EmployeeService{
@Autowired
private EmployeeDaoImpl employeeDao; //这里的属性名就要写employeeDao了@Override
public void save(Employee employee) {
employeeDao.save(employee);
}
}//bean.xml里需要声明包扫描(包名的位置取决于dao和service层最小共同包名)：
<context:component-scan base-package="包名"/>//测试这么写
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
employeeService = (EmployeeService)ctx.getBean("employeeService");//注意：这里写employeeService