@Transactional error - .IllegalArgumentException: Can not set xxx field xxxDAO

[shinokamparos]

Hi,

I am getting this error when I add a @Transactional annotation to my DAO class:

Caused by: java.lang.IllegalArgumentException: Can not set xxx.DAOHibernateImpl field xxx.DAOHibernateImpl.userDAO to $Proxy20

When I remove @Transactional there is no error.

My applicationContext is as follows:

<?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:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"

	xsi:schemaLocation="
	    http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.0.xsd
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
        http://www.springframework.org/schema/tx 
        http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
        ">


	<!-- autodetect these classes and register the corresponding beans  -->
	<context:component-scan base-package="com.accounts" />

	<!-- tells Spring annotations are used -->
	<context:annotation-config />

	<!-- DATABASE STUFF -->

	<!--
		This defines a Hibernate Session Factory. This Hibernate Session holds
		objects that it manages while they are in use. A list of annotated
		classes must be given to the Session Factory. The datasource defined
		above is used for this session. Finally, the hibernate.dialect
		property is set to the MySQL dialect.
	-->
	<bean id="sessionFactory" name="sessionFactory"
		class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"
		destroy-method="destroy">
		<property name="annotatedClasses">
			<list>
				<value>com.accounts.client.domain.BankAccount</value>
				<value>com.accounts.client.domain.BankTransaction</value>
				<value>com.accounts.client.domain.Purchase</value>
				<value>com.accounts.client.domain.Sale</value>
				<value>com.accounts.client.domain.User</value>
			</list>
		</property>

		<property name="dataSource" ref="dataSource" />

		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.dialect">org.hibernate.dialect.HSQLDialect</prop>

				<prop key="hibernate.transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory
				</prop>
			</props>
		</property>
	</bean>


	<!--
		The datasource bean tells Spring how to connect to MySQL. There is a
		driver name, the username and password, a JDBC URL to the accounts
		database and an initial, max, and idle connection pool size. The Pool
		is managed by dbcp's BasicDataSource from our Maven Dependencies
		declarations.
	-->

	<bean id="dataSource" name="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/accounts</value>
		</property>
		<property name="username">
			<value>root</value>
		</property>
		<property name="password">
			<value></value>
		</property>
		<property name="initialSize">
			<value>2</value>
		</property>
		<property name="maxActive">
			<value>5</value>
		</property>
		<property name="maxIdle">
			<value>2</value>
		</property>
	</bean>


	<!--
		The Transaction Manager is needed to track the start and end of
		database transactions. Spring comes with its own transaction manager
		specifically for Hibernate.
	-->

	<!-- TRANSACTION MANAGER -->
	<bean id="transactionManager" name="transactionManager"
		class="org.springframework.orm.hibernate3.HibernateTransactionManager">
		<property name="sessionFactory" ref="sessionFactory" />
	</bean>

	<!--
		Here we tell Spring that we are going to manage Transactions through
		annotations (and we will have a @Transactional annotation in this
		project, so we need this).
	-->
	<!-- ANNOTATION DRIVEN TRANSACTIONS -->
	<tx:annotation-driven transaction-manager="transactionManager" />
</beans>

An example DAO class is:

@Repository("baseObjectDAOHibernateImpl")
public class BaseObjectDAOHibernateImpl implements BaseObjectDAO {

	private static final Log log = LogFactory
			.getLog(BaseObjectDAOHibernateImpl.class);

	@Autowired
	@Qualifier("sessionFactory")
	public SessionFactory sessionFactory;
        
        public BaseObject save(BaseObject baseObject) {
		log.debug("persisting one instance of baseobject");
		try {
			sessionFactory.getCurrentSession().saveOrUpdate(
					baseObject);
			log.debug("persist one instance successful");

		} catch (RuntimeException re) {
			log.error("persist one instance failed", re);
			throw re;
		}
		return baseObject;
	}

Any help would be greatly appreciated.

[pdurcek]

Were you able to solve your problem? We are experiencing something very similar.

- P

Follow-up: We did get around the problem by putting an interface in front of the injected class.