Error while Proxying DAO Classes

[Vivek Kr Singh]

I am pasting this after searching the forum and not finding a suitable answer for this. I am using spring-2.5.6 and implementing AOP in my application.

Below is my Spring Config:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

	<bean id="dataSource"
		class="org.springframework.jdbc.datasource.DriverManagerDataSource">
		<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />
		<property name="url" value="jdbc:oracle:thin:@127.0.0.1:1521:XE" />
		<property name="username" value="hr" />
		<property name="password" value="hr" />
	</bean>

	<bean id="sessionFactory"
		class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
		<property name="dataSource" ref="dataSource" />
		<property name="annotatedClasses">
			<list>
				<value>com.vivek.spring.employee.vo.Employee
				</value>
			</list>
		</property>
		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.dialect">org.hibernate.dialect.OracleDialect
				</prop>
				<prop key="hibernate.show_sql">true</prop>
			</props>
		</property>
	</bean>


	<bean id="hibernateEmployeeDAO"
		class="com.vivek.spring.employee.hibernate.dao.HibernateEmployeeDAO">
		<property name="sessionFactory" ref="sessionFactory" />
	</bean>

	<bean id="jdbcEmployeeDAO" class="com.vivek.spring.employee.jdbc.dao.EmployeeDAO">
		<property name="dataSource" ref="dataSource" />
	</bean>

	<bean id="employeesService" class="com.vivek.spring.employee.service.EmployeesService">
		<property name="employeeDAO" ref="jdbcEmployeeDAO" />
		<property name="hibernateEmployeeDAO" ref="hibernateEmployeeDAO" />
	</bean>

	<bean id="interceptor" class="com.vivek.spring.advice.LoggingAdvice" />

	<bean id="proxyCreator"
		class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
		<property name="beanNames">
			<list>
				<value>*DAO</value>
				<value>*Service</value>
			</list>
		</property>
		<property name="frozen">
			<value>true</value>
		</property>
		<property name="interceptorNames">
			<list>
				<value>interceptor</value>
			</list>
		</property>
	</bean>

</beans>

On container init the following error is generated:
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'employeesService' defined in class path resource [springConfig.xml]: Initialization of bean failed; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert property value of type [$Proxy10 implementing org.springframework.beans.factory.InitializingBean,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised] to required type [com.vivek.spring.employee.jdbc.dao.EmployeeDAO] for property 'employeeDAO'; nested exception is java.lang.IllegalArgumentException: Cannot convert value of type [$Proxy10 implementing org.springframework.beans.factory.InitializingBean,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised] to required type [com.vivek.spring.employee.jdbc.dao.EmployeeDAO] for property 'employeeDAO': no matching editors or conversion strategy found

This error is not generated when i am proxying only the Service classes using "*Service".

Snippet of Service Class

  public class EmployeesService {

	private EmployeeDAO employeeDAO;

	private HibernateEmployeeDAO hibernateEmployeeDAO;

	public EmployeeDAO getEmployeeDAO() {
		return employeeDAO;
	}

	public void setEmployeeDAO(EmployeeDAO employeeDAO) {
		this.employeeDAO = employeeDAO;
	}

	public HibernateEmployeeDAO getHibernateEmployeeDAO() {
		return hibernateEmployeeDAO;
	}

	public void setHibernateEmployeeDAO(
			HibernateEmployeeDAO hibernateEmployeeDAO) {
		this.hibernateEmployeeDAO = hibernateEmployeeDAO;
	}

It would be great if spring guru's can point out the mistake in configuration.

Mod's it is a long message i have posted. Please let me know if this need to be split into 2-3 posts.

[Hong Anderson]

You proxy both Dao and Service, and also inject (proxy)Dao to Service so TypeMismatchException happens.

[Vivek Kr Singh]

Thanks for the answer. Is there any way AOP can be applied on the DAO classes ?