$Proxy25 cannot be cast to my class

[mujer_esponja]

Hello, I am getting this exception while running a Test (I am trying to configure aop in spring):

   java.lang.ClassCastException: $Proxy25 cannot be cast to path.UserDao
    	at com.path.TestCreateOntologyDB.testGenerateGlobalAnnotation(TestCreateOntologyDB.java:49)
    	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    	at java.lang.reflect.Method.invoke(Method.java:597)
    	at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:59)
    	at org.junit.internal.runners.MethodRoadie.runTestMethod(MethodRoadie.java:98)
    	at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:79)
    	at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:87)
    	at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:77)
    	at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:42)
    	at org.junit.internal.runners.JUnit4ClassRunner.invokeTestMethod(JUnit4ClassRunner.java:88)
    	at org.junit.internal.runners.JUnit4ClassRunner.runMethods(JUnit4ClassRunner.java:51)
    	at org.junit.internal.runners.JUnit4ClassRunner$1.run(JUnit4ClassRunner.java:44)
    	at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:27)
    	at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:37)
    	at org.junit.internal.runners.JUnit4ClassRunner.run(JUnit4ClassRunner.java:42)
    	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
    	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

UserDao.java

public class UserDao extends AbstractHibernateDAOSupport {
    
    	public UserDao() {
    		super();
    	}
    
    	/**
    	 * Insert a new User into the database.
    	 * 
    	 * @param user
    	 */
    	public void store(User user) throws DataAccessLayerException {
    		super.save(user);
    	}
    
    	/**
    	 * Delete a User from the database.
    	 * 
    	 * @param user
    	 */
    	public void delete(User user) throws DataAccessLayerException {
    		super.delete(user);
    	}
    
    	/**
    	 * Updates the state of a detached User.
    	 * 
    	 * @param user
    	 */
    	public void update(User user) throws DataAccessLayerException {
    		super.update(user);
    	}
    
    	public User findByID(String id) throws DataAccessLayerException {
    		return (User) this.find(User.class, id);
    
    	}
    	
    	/**
    	 * Finds all Users in the database.
    	 * 
    	 * @return
    	 */
    	public List findAll() throws DataAccessLayerException {
    		return super.findAll(User.class);
    	}

Spirng configuration files: applicationContext-dao.xml

<bean id="userDao" class="path.UserDao">
    		<property name="sessionFactory">
    			<ref bean="sessionFactory" />
    		</property>
    	</bean>

TestCreateOntologyDB.java

  ....  
    ApplicationContext ctx ;
    	
    	public TestCreateOntologyDB() {
    		ctx = new ClassPathXmlApplicationContext("/applicationContext.xml");
    	}
    	
    	@Test
    	public void testGenerateGlobalAnnotation(){
    		UserDao userDao = (UserDao)ctx.getBean("userDao");
    
    ...

And I haven't set up any UserDao additional propperty in any other configuration file. What could be the error?? Any help would be appreciated. Thanks in advance

[DaveyS]

You probably need to configure your transactions in you test context file.

Something like.

<tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true"/>

It looks like you are missing the proxy-target-class attribute.

[mujer_esponja]

If I am not wrong, I think I have already this configuration in another file: applicationContext-service.xml

<?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"
	xsi:schemaLocation="
	http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-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">

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

	<aop:aspectj-autoproxy />
	<tx:advice id="txAdvice" transaction-manager="transactionManager">
		<tx:attributes>
			<tx:method name="*" propagation="REQUIRED" />
		</tx:attributes>
	</tx:advice>

	<aop:config>
		<aop:pointcut id="serviceOperation"
			expression="execution(* path.**.*(..)) || execution(* path.**.*(..)) "  />
	-->
		<aop:advisor advice-ref="txAdvice" pointcut-ref="serviceOperation" />
	</aop:config>

	<bean id="ontologyDao" class="path.OntologyDao">
	
		<property name="sessionFactory" ref="sessionFactory" />
 
</beans>

[Marten Deinum]

I suggest the forum search, as this question has been answered numerous times before. As the previous poster stated enable class proxies or create proper interfaces and program to those.

[mujer_esponja]

Thanks, but before writting here my question I tried to find something in different forums which could help me, but without success...

I have realized that probably, the error is here:

<aop:config>
<aopointcut id="serviceOperation"
expression="execution(* path.model.**.*(..)) || execution(* path.dao.**.*(..)) " />
<aop:advisor advice-ref="txAdvice" pointcut-ref="serviceOperation" />

</aop:config>

maybe in the expression, but I can't solve it, because this point is not very clear for me, even reading documentations about that

[Marten Deinum]

Have you actually READ my post.

As the previous poster stated enable class proxies or create proper interfaces and program to those.

How to do that is documented in the reference guide. I also suggest a read on how proxies work and the difference between JDK Dynamic Proxies and class proxies.

[mujer_esponja]

Following your link, and also this example, I created a package in: path.services with the classes that will be working with aop, and also another package: path.services.impl, with the appropiate interfaces for them.

Then, I change the configurations file, writting on it:

<aop:config>
<aopointcut id="serviceOperation"
expression="execution(* path.services.**.*(..))" />

<aop:advisor advice-ref="txAdvice" pointcut-ref="serviceOperation" />

</aop:config>

The error is still there. I am new in aop, and in spring configuration for this, consider that, please.

Thanks your answer

[DaveyS]

I think this is the line you are missing:

<aop:aspectj-autoproxy proxy-target-class="true"/>

[mujer_esponja]

Yes, that was it!!
Thank you very much!!

I just had

<aop:aspectj-autoproxy/>

PS. I had also to add this dependency to my pom.xml

<dependency>
<groupId>cglib</groupId>
<artifactId>cglib</artifactId>
<version>2.2</version>
</dependency>

[DaveyS]

No probs. Glad you've got it fixed now.