java spring+jpa @service 注解不起作用 我在业务层用了@service 注解 测试类里面得不到相应的Bean,求解释

测试代码（关键部分）：
public static void setUpBeforeClass() throws Exception {
try {
ApplicationContext act = new ClassPathXmlApplicationContext(
"applicationContext.xml");
productSortService = (ProductSortService) act
.getBean("ProductSortServiceImpl");
} catch (RuntimeException e) {
e.printStackTrace();
}
}

配置文件:

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
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">


class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">


class="org.springframework.orm.jpa.JpaTransactionManager">
ref="entityManagerFactory" />




bean代码：

@Service
@Transactional
public class ProductSortServiceImpl extends DaoSupport implements
ProductSortService {

}

productSortService = (ProductSortService) act.getBean("ProductSortServiceImpl");
改为productSortService = (ProductSortService) act.getBean("productSortServiceImpl");
spring的注解@service默认的名字是驼峰命名法，你也可以指定bean的名字@service(“beanName”)。

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