Autoproxying

**leaqui** · Jun 8th, 2007, 03:12 PM

Hi, I have a problem with autoproxying. Can I use autoproxying and manual proxying (by xml) on the same beans? Where can I find more information than in the reference about how does autoproxying work?
My problem is that when I try to autoproxy a proxyed bean, an exception is thrown.

Code:

17:02:19,187 - ERROR - [] - [org.springframework.web.context.ContextLoader] - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'urlMapping' defined in class path resource [Spring-ServiceMappings.xml]: Can't resolve reference to bean 'urlMappingsFactoryBean' while setting property 'urlMap'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'urlMappingsFactoryBean': FactoryBean threw exception on object creation; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entidadesBasicas.domain.MapeoServicioInstitucionCRUDService' defined in class path resource [Spring-EntidadesBasicasServiceProxies.xml]: Initialization of bean failed; nested exception is org.aopalliance.aop.AspectException: null
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'urlMappingsFactoryBean': FactoryBean threw exception on object creation; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entidadesBasicas.domain.MapeoServicioInstitucionCRUDService' defined in class path resource [Spring-EntidadesBasicasServiceProxies.xml]: Initialization of bean failed; nested exception is org.aopalliance.aop.AspectException: null
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entidadesBasicas.domain.MapeoServicioInstitucionCRUDService' defined in class path resource [Spring-EntidadesBasicasServiceProxies.xml]: Initialization of bean failed; nested exception is org.aopalliance.aop.AspectException: null
java.lang.IllegalArgumentException: Cannot subclass final class class $Proxy49

Thanks!!!!

Leandro

**Jörg Heinicke** · Jun 8th, 2007, 08:28 PM

Proxying a proxy can be problematic. In your case it even seems to be impossible. Your manual proxy seems to be a CGLib one, not one based on JDK dynamic proxies. From what I understand it's final and not further on sub classable. Isn't it possible to apply multiple advisors in one proxying step? Both chapter 6 and chapter 7 are about AOP, 7.9 in particular is about autoproxying.

Jörg

**karldmoore** · Jun 9th, 2007, 10:47 AM

Is it possible to see what you are actually trying to do in the configuration?

**leaqui** · Jun 11th, 2007, 07:42 AM

Yes, this is the autoproxy configuration:

Code:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>
	<bean id="logAutoProxyCreator"
		class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
		<property name="beanNames">
			<value>*ServiceTarget</value>
		</property>
		<property name="interceptorNames">
			<idref bean="logAdvice" />
		</property>
		<property name="proxyTargetClass">
			<value>true</value>
		</property>
	</bean>
</beans>

I've added the proxyTargetClass property and now the exception is:

Code:

09:28:10,140 - ERROR - [] - [org.springframework.web.context.ContextLoader] - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'urlMapping' defined in class path resource [Spring-ServiceMappings.xml]: Can't resolve reference to bean 'urlMappingsFactoryBean' while setting property 'urlMap'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'urlMappingsFactoryBean': FactoryBean threw exception on object creation; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'loginService' defined in class path resource [Spring-SeguridadServiceProxies.xml]: Can't resolve reference to bean 'loginServiceTarget' while setting property 'target'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'loginServiceTarget' defined in class path resource [Spring-SeguridadServiceImpls.xml]: Initialization of bean failed; nested exception is org.aopalliance.aop.AspectException: null
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'urlMappingsFactoryBean': FactoryBean threw exception on object creation; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'loginService' defined in class path resource [Spring-SeguridadServiceProxies.xml]: Can't resolve reference to bean 'loginServiceTarget' while setting property 'target'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'loginServiceTarget' defined in class path resource [Spring-SeguridadServiceImpls.xml]: Initialization of bean failed; nested exception is org.aopalliance.aop.AspectException: null
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'loginService' defined in class path resource [Spring-SeguridadServiceProxies.xml]: Can't resolve reference to bean 'loginServiceTarget' while setting property 'target'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'loginServiceTarget' defined in class path resource [Spring-SeguridadServiceImpls.xml]: Initialization of bean failed; nested exception is org.aopalliance.aop.AspectException: null
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'loginServiceTarget' defined in class path resource [Spring-SeguridadServiceImpls.xml]: Initialization of bean failed; nested exception is org.aopalliance.aop.AspectException: null
java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
	at net.sf.cglib.proxy.Enhancer.emitConstructors(Enhancer.java:718)
	at net.sf.cglib.proxy.Enhancer.generateClass(Enhancer.java:499)
	at net.sf.cglib.transform.TransformingClassGenerator.generateClass(TransformingClassGenerator.java:33)
	at net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
	at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216)
	at net.sf.cglib.proxy.Enhancer.createHelper(Enhancer.java:377)
	at net.sf.cglib.proxy.Enhancer.create(Enhancer.java:285)
	at org.springframework.aop.framework.Cglib2AopProxy.getProxy(Cglib2AopProxy.java:199)
	at org.springframework.aop.framework.Cglib2AopProxy.getProxy(Cglib2AopProxy.java:156)
	at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:70)
	at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.createProxy(AbstractAutoProxyCreator.java:375)
	at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:237)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:267)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:364)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:226)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:147)
	at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:176)
	at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:105)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1013)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:824)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:345)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:226)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:147)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getType(AbstractBeanFactory.java:342)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.isBeanTypeMatch(DefaultListableBeanFactory.java:249)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:144)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:198)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:192)
	at org.springframework.context.support.AbstractApplicationContext.getBeansOfType(AbstractApplicationContext.java:608)

And this is the manual configuration on loginServiceTarget:

Code:

	<bean id="loginServiceTarget"
		class="seguridad.service.LoginServiceImpl">
		<constructor-arg>
			<ref bean="hibernateRepository" />
		</constructor-arg>
		<property name="novellLDAPDAO">
			<ref bean="novellLDAPDAO" />
		</property>
		<property name="loginPolicyValidator">
			<ref bean="loginPolicyValidator" />
		</property>
	</bean>

and loginService:

Code:

	<bean id="loginService"
		class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
		<property name="target">
			<ref bean="loginServiceTarget" />
		</property>
		<property name="transactionManager">
			<ref bean="transactionManager" />
		</property>
		<property name="transactionAttributes">
			<props>
				<prop key="*">PROPAGATION_REQUIRED</prop>
			</props>
		</property>
		<property name="preInterceptors">
			<list>
				<ref bean="logAdvisor" />
				<ref bean="exceptionAdvisor" />
			</list>
		</property>
		<property name="postInterceptors">
			<list>
				<ref bean="soloLogEventAdvisor" />
			</list>
		</property>
	</bean>

Thanks!!

Leandro

**karldmoore** · Jun 11th, 2007, 12:17 PM

Why can't you add the "logAdvice" to either the TransactionProxyFactoryBean's interceptors instead of using the autowiring?

**leaqui** · Jun 11th, 2007, 12:47 PM

Because I want to add the logAdvice to all my services.

Leandro

**karldmoore** · Jun 11th, 2007, 12:53 PM

I would guess that you are using JDK dynamic proxies for the TransactionProxyFactoryBean and as I understand it, these are final. Have you tried proxyTargetClass="true" on this as well?
http://java.sun.com/j2se/1.5.0/docs/...ion/proxy.html

**Jörg Heinicke** · Jun 11th, 2007, 06:26 PM

Originally Posted by karldmoore

I would guess that you are using JDK dynamic proxies for the TransactionProxyFactoryBean and as I understand it, these are final. Have you tried proxyTargetClass="true" on this as well?

Actually it must be the other way around. CGLib proxies need a default constructor which the class obviously does not have:

Code:

java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
	at net.sf.cglib.proxy.Enhancer.emitConstructors(Enhancer.java:718)
	at net.sf.cglib.proxy.Enhancer.generateClass(Enhancer.java:499)
	at net.sf.cglib.transform.TransformingClassGenerator.generateClass(TransformingClassGenerator.java:33)

(Also the stacktrace points to CGLib, Karl

)

So he needs to switch to JDK dynamic proxies - or provide a default constructor.

Jörg

**leaqui** · Jun 13th, 2007, 07:35 AM

Yes, the problem was the lack of the default constructor...
But now I've a new one...

Code:

09:02:06,234 - ERROR - [] - [org.springframework.web.context.ContextLoader] - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'urlMapping' defined in class path resource [Spring-ServiceMappings.xml]: Can't resolve reference to bean 'urlMappingsFactoryBean' while setting property 'urlMap'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'urlMappingsFactoryBean': FactoryBean threw exception on object creation; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mapeoServicioInstitucionServiceImpl' defined in class path resource [Spring-EntidadesBasicasServiceProxies.xml]: Can't resolve reference to bean 'mapeoServicioInstitucionServiceImplTarget' while setting property 'target'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mapeoServicioInstitucionServiceImplTarget' defined in class path resource [Spring-EntidadesBasicasServiceImpls.xml]: Error setting property values; nested exception is org.springframework.beans.PropertyAccessExceptionsException: PropertyAccessExceptionsException (1 errors); nested propertyAccessExceptions are: [org.springframework.beans.TypeMismatchException: Failed to convert property value of type [$Proxy29] to required type [services.crud.AbstractCRUDService] for property 'servicioInstitucionCRUDService']
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'urlMappingsFactoryBean': FactoryBean threw exception on object creation; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mapeoServicioInstitucionServiceImpl' defined in class path resource [Spring-EntidadesBasicasServiceProxies.xml]: Can't resolve reference to bean 'mapeoServicioInstitucionServiceImplTarget' while setting property 'target'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mapeoServicioInstitucionServiceImplTarget' defined in class path resource [Spring-EntidadesBasicasServiceImpls.xml]: Error setting property values; nested exception is org.springframework.beans.PropertyAccessExceptionsException: PropertyAccessExceptionsException (1 errors); nested propertyAccessExceptions are: [org.springframework.beans.TypeMismatchException: Failed to convert property value of type [$Proxy29] to required type [services.crud.AbstractCRUDService] for property 'servicioInstitucionCRUDService']
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mapeoServicioInstitucionServiceImpl' defined in class path resource [Spring-EntidadesBasicasServiceProxies.xml]: Can't resolve reference to bean 'mapeoServicioInstitucionServiceImplTarget' while setting property 'target'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mapeoServicioInstitucionServiceImplTarget' defined in class path resource [Spring-EntidadesBasicasServiceImpls.xml]: Error setting property values; nested exception is org.springframework.beans.PropertyAccessExceptionsException: PropertyAccessExceptionsException (1 errors); nested propertyAccessExceptions are: [org.springframework.beans.TypeMismatchException: Failed to convert property value of type [$Proxy29] to required type [services.crud.AbstractCRUDService] for property 'servicioInstitucionCRUDService']
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mapeoServicioInstitucionServiceImplTarget' defined in class path resource [Spring-EntidadesBasicasServiceImpls.xml]: Error setting property values; nested exception is org.springframework.beans.PropertyAccessExceptionsException: PropertyAccessExceptionsException (1 errors); nested propertyAccessExceptions are: [org.springframework.beans.TypeMismatchException: Failed to convert property value of type [$Proxy29] to required type [services.crud.AbstractCRUDService] for property 'servicioInstitucionCRUDService']
PropertyAccessExceptionsException (1 errors)
org.springframework.beans.TypeMismatchException: Failed to convert property value of type [$Proxy29] to required type [services.crud.AbstractCRUDService] for property 'servicioInstitucionCRUDService'
	at org.springframework.beans.BeanWrapperImpl.doTypeConversionIfNecessary(BeanWrapperImpl.java:839)
	at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:584)
	at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:469)
	at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:626)
	at org.springframework.beans.BeanWrapperImpl.setPropertyValues(BeanWrapperImpl.java:653)
	at org.springframework.beans.BeanWrapperImpl.setPropertyValues(BeanWrapperImpl.java:642)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1023)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:824)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:345)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:226)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:147)
	at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:176)
	at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:105)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1013)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:824)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:345)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:226)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:147)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getType(AbstractBeanFactory.java:342)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.isBeanTypeMatch(DefaultListableBeanFactory.java:249)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:144)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:198)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:192)
	at org.springframework.context.support.AbstractApplicationContext.getBeansOfType(AbstractApplicationContext.java:608)

This is the new autoproxy configuration:

Code:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>
	<bean id="logAutoProxyCreator"
		class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
		<property name="beanNames">
			<value>*ServiceTarget, *ServiceImplTarget</value>
		</property>
		<property name="interceptorNames">
			<idref bean="logAdvice" />
		</property>
		<property name="proxyTargetClass">
			<value>true</value>
		</property>
	</bean>
</beans>

This the target configuration:

Code:

	<bean id="mapeoServicioInstitucionServiceImplTarget" class="entidadesBasicas.services.impl.MapeoServicioInstitucionServiceImpl">
		<property name="mapeoServicioInstitucionCRUDService">
			<ref bean="entidadesBasicas.domain.MapeoServicioInstitucionCRUDService" />
		</property>
		<property name="aperturaProgramaticaCRUDService">
			<ref bean="entidadesBasicas.domain.AperturaProgramaticaCRUDService" />
		</property>
		<property name="imputacionFisicaCRUDService">
			<ref bean="entidadesBasicas.domain.ImputacionFisicaCRUDService" />
		</property>
		<property name="servicioInstitucionCRUDService">
			<ref bean="tablasBasicas.ElementoBasicoCRUDService" />
		</property>
	</bean>

and this is the proxy configuration:

Code:

	<bean id="mapeoServicioInstitucionServiceImpl"
class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
		<property name="target">
			<ref bean="mapeoServicioInstitucionServiceImplTarget" />
		</property>
		<property name="transactionManager">
			<ref bean="transactionManager" />
		</property>
		<property name="preInterceptors">
			<list>
				<ref bean="logAdvisor" />
				<ref bean="exceptionAdvisor" />
				<ref bean="dataAccessExceptionInterceptor" />
			</list>
		</property>
		<property name="postInterceptors">
			<list>
				<ref
bean="entidadesBasicasBusinessServiceValidationAdvisor" />
			</list>
		</property>
		<property name="transactionAttributes">
			<props>
				<prop key="mapear">PROPAGATION_REQUIRED</prop>
			</props>
		</property>
	</bean>

Do you know how can I resolve it?
Thanks!!!!!!!

Leandro

**Jörg Heinicke** · Jun 13th, 2007, 08:04 AM

Now you are at the point having JDK dynamic proxies where you actually need CGLib proxies since you don't program to interfaces. As Karl described it (actually he is ahead of the times, he did see this problem coming!

) you have to add the property proxyTargetClass="true" to TransactionProxyFactoryBean.

But I guess you will run into another problem since you are proxying your object using the BeanNameAutoProxyCreator and the TransactionProxyFactoryBean. So you end up with twice proxied objects. It really should be avoided if it works at all.

(From a recent thread I got that CGLib proxies are actually final classes and can't be extended. Since they are themselves based on extending the original class your setup would fail. I haven't confirmed that myself though.)

Jörg

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