Spring Proxy exception - Proxy13

[AlexElba]

Hello

I have problem which was not able to solve so far. I am getting Proxy13 exception during execution.

Please can someone help me with solving this?

Here are my classes

public class MainExecutor {

	DoStuff consumer;

	public static void main() {
		this.consumer = (DoStuff) applicationContext.getBean("doConsumer",
				DoStuff.class);
		ExecutorService executorService = Executors
				.newFixedThreadPool(numOfThreads * 2);
		for (int i = 0; i < numOfThreads; i++) {
			executorService.execute(consumer);
		}
	}
}

public class DoStuff implements Runnable, Serializable {
	@Override
	@Transactional
	public void run() {
		doLotOfStuff();
	}

	private void doLotOfStuff() {
		System.out.println("Hello world");
	}

}

from Application Context
....

    <bean id="doConsumer"
        class="player.controller.DoStuff" >
    </bean>

....

After executing main method I am getting folowing exception

Exception in thread "main" org.springframework.beans.factory.BeanCreationExce ption: Error creating bean with name 'doConsumer' defined in class path resource [applicationContext.xml]: Initialization of bean failed; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert property value of type [$Proxy13 implementing java.lang.Runnable,java.io.Serializable,org.spring framework.aop.SpringProxy,org.springframework.aop. framework.Advised] to required type [player.controller.DoStuff] for property 'doConsumer'; nested exception is java.lang.IllegalArgumentException: Cannot convert value of type [$Proxy13 implementing java.lang.Runnable,java.io.Serializable,org.spring framework.aop.SpringProxy,org.springframework.aop. framework.Advised] to required type [player.controller.DoStuff] for property 'doConsumer': no matching editors or conversion strategy found
at org.springframework.beans.factory.support.Abstract AutowireCapableBeanFactory.doCreateBean(AbstractAu towireCapableBeanFactory.java:480)
at org.springframework.beans.factory.support.Abstract AutowireCapableBeanFactory$1.run(AbstractAutowireC apableBeanFactory.java:409)
at java.security.AccessController.doPrivileged(Native Method)
at org.springframework.beans.factory.support.Abstract AutowireCapableBeanFactory.createBean(AbstractAuto wireCapableBeanFactory.java:380)
at org.springframework.beans.factory.support.Abstract BeanFactory$1.getObject(AbstractBeanFactory.java:2 64)
at org.springframework.beans.factory.support.DefaultS ingletonBeanRegistry.getSingleton(DefaultSingleton BeanRegistry.java:222)
at org.springframework.beans.factory.support.Abstract BeanFactory.doGetBean(AbstractBeanFactory.java:261 )
at org.springframework.beans.factory.support.Abstract BeanFactory.getBean(AbstractBeanFactory.java:185)
at org.springframework.beans.factory.support.Abstract BeanFactory.getBean(AbstractBeanFactory.java:164)
at org.springframework.beans.factory.support.DefaultL istableBeanFactory.preInstantiateSingletons(Defaul tListableBeanFactory.java:429)
at org.springframework.context.support.AbstractApplic ationContext.finishBeanFactoryInitialization(Abstr actApplicationContext.java:728)
at org.springframework.context.support.AbstractApplic ationContext.refresh(AbstractApplicationContext.ja va:380)
at org.springframework.context.support.ClassPathXmlAp plicationContext.<init>(ClassPathXmlApplicationCon text.java:139)
at org.springframework.context.support.ClassPathXmlAp plicationContext.<init>(ClassPathXmlApplicationCon text.java:93)
at player.main(MainExecutor.java:117)
Caused by: org.springframework.beans.TypeMismatchException: Failed to convert property value of type [$Proxy13 implementing java.lang.Runnable,java.io.Serializable,org.spring framework.aop.SpringProxy,org.springframework.aop. framework.Advised] to required type [player.controller.DoStuff] for property 'doConsumer'; nested exception is java.lang.IllegalArgumentException: Cannot convert value of type [$Proxy13 implementing java.lang.Runnable,java.io.Serializable,org.spring framework.aop.SpringProxy,org.springframework.aop. framework.Advised] to required type [player.controller.DoStuff] for property 'doConsumer': no matching editors or conversion strategy found
at org.springframework.beans.BeanWrapperImpl.convertF orProperty(BeanWrapperImpl.java:391)
at org.springframework.beans.factory.support.Abstract AutowireCapableBeanFactory.convertForProperty(Abst ractAutowireCapableBeanFactory.java:1289)
at org.springframework.beans.factory.support.Abstract AutowireCapableBeanFactory.applyPropertyValues(Abs tractAutowireCapableBeanFactory.java:1250)
at org.springframework.beans.factory.support.Abstract AutowireCapableBeanFactory.populateBean(AbstractAu towireCapableBeanFactory.java:1010)
at org.springframework.beans.factory.support.Abstract AutowireCapableBeanFactory.doCreateBean(AbstractAu towireCapableBeanFactory.java:472)
... 14 more
Caused by: java.lang.IllegalArgumentException: Cannot convert value of type [$Proxy13 implementing java.lang.Runnable,java.io.Serializable,org.spring framework.aop.SpringProxy,org.springframework.aop. framework.Advised] to required type [player.controller.DoStuff] for property 'doConsumer': no matching editors or conversion strategy found
at org.springframework.beans.TypeConverterDelegate.co nvertIfNecessary(TypeConverterDelegate.java:231)
at org.springframework.beans.TypeConverterDelegate.co nvertIfNecessary(TypeConverterDelegate.java:138)
at org.springframework.beans.BeanWrapperImpl.convertF orProperty(BeanWrapperImpl.java:386)
... 18 more

[Marten Deinum]

I suggest you read chapter 6 of the reference guide, that explains how spring utilizes AOP. Spring uses a proxy based approach and by default it uses a proxy based approach based on interfaces.

There is a dynamic class created which implements Serializable and Runnable (the 2 interfaces you implements) to the dynamic class is a Runnable and Serializable it is NOT a DoStuff class anymore (as the classcast already suggests).

You have 3 choices
1) Cast to a Runnable instead of a DoStuff (the executor service needs a runnable(
2) Switch to class proxing (chapter 6 explains this)
3) Make DoStuff an interface and your class DoStuffImpl that way DoStuff will be part of the list of interfaces implemented by the dynamic proxy.