Hi -

I have a DAO layer with a sample DAO class like the following :

public class PersonDao extends DAOBase<Person> {
....
}

I would like to enhance the DAO layer with implementing an additional interface. I plan to do this using Introduction (@DeclareParents). The interface is defined as follows :

public interface ICounter {
<Context, T extends DTOBase> int count(Context ctx,
DAOBase<T> dao,
ICriteria cri);
}

It also has a default implementation CounterImpl.

The aspect class which I call DAODecorator is as follows :

@Aspect
public class DAODecorator {

@DeclareParents(value="com.x.y.z.dao.*+",
defaultImpl=CounterImpl.class)
public ICounter mixin;
}

The corresponding entries in config file are :

<aop:aspectj-autoproxy/>

<bean id="daoMixin"
class="com.x.y.z.dao.DAODecorator">
</bean>

<bean id="daoImpl"
class="com.x.y.z.DAOJPAImpl">
</bean>

<bean id="entreeDao"
class="com.x.y.z.dao.EntreeDao"
lazy-init="true"
factory-method="makeDAO">
<constructor-arg index="0"><ref bean="daoImpl"/></constructor-arg>
</bean>

Now when I run I get the following exception :

org.springframework.beans.factory.BeanCreationExce ption: Error creating bean with name 'com.x.y.z.EntreeDaoTests': Error setting property values; nested exception is PropertyAccessExceptionsException (1 errors)
Caused by: PropertyAccessExceptionsException (1 errors)
org.springframework.beans.TypeMismatchException: Failed to convert property value of type [$Proxy14] to required type [com.x.y.z.dao.EntreeDao] for property 'entreeDao'; nested exception is java.lang.IllegalArgumentException: No matching editors or conversion strategy found
Caused by: java.lang.IllegalArgumentException: No matching editors or conversion strategy found
at org.springframework.beans.PropertyTypeConverter.co nvertIfNecessary(PropertyTypeConverter.java:209)
at org.springframework.beans.PropertyTypeConverter.co nvertIfNecessary(PropertyTypeConverter.java:108)
at org.springframework.beans.BeanWrapperImpl.setPrope rtyValue(BeanWrapperImpl.java:723)
at org.springframework.beans.BeanWrapperImpl.setPrope rtyValue(BeanWrapperImpl.java:575)
at org.springframework.beans.AbstractPropertyAccessor .setPropertyValue(AbstractPropertyAccessor.java:49 )
at org.springframework.beans.AbstractPropertyAccessor .setPropertyValues(AbstractPropertyAccessor.java:6 8)
at org.springframework.beans.AbstractPropertyAccessor .setPropertyValues(AbstractPropertyAccessor.java:5 7)
at org.springframework.beans.factory.support.Abstract AutowireCapableBeanFactory.applyPropertyValues(Abs tractAutowireCapableBeanFactory.java:816)
at org.springframework.beans.factory.support.Abstract AutowireCapableBeanFactory.populateBean(AbstractAu towireCapableBeanFactory.java:592)
at org.springframework.beans.factory.support.Abstract AutowireCapableBeanFactory.autowireBeanProperties( AbstractAutowireCapableBeanFactory.java:237)
at org.springframework.test.AbstractDependencyInjecti onSpringContextTests.setUp(AbstractDependencyInjec tionSpringContextTests.java:201)
at junit.framework.TestCase.runBare(TestCase.java:125 )
at org.springframework.test.ConditionalTestCase.runBa re(ConditionalTestCase.java:69)
at org.springframework.test.annotation.AbstractAnnota tionAwareTransactionalTests.access$001(AbstractAnn otationAwareTransactionalTests.java:44)
at org.springframework.test.annotation.AbstractAnnota tionAwareTransactionalTests$1.run(AbstractAnnotati onAwareTransactionalTests.java:112)
at org.springframework.test.annotation.AbstractAnnota tionAwareTransactionalTests.runTest(AbstractAnnota tionAwareTransactionalTests.java:177)
at org.springframework.test.annotation.AbstractAnnota tionAwareTransactionalTests.runTestTimed(AbstractA nnotationAwareTransactionalTests.java:150)
at org.springframework.test.annotation.AbstractAnnota tionAwareTransactionalTests.runBare(AbstractAnnota tionAwareTransactionalTests.java:108)
at org.springframework.test.jpa.AbstractJpaTests.runB are(AbstractJpaTests.java:156)
at org.springframework.test.jpa.AbstractJpaTests.runB are(AbstractJpaTests.java:235)
at junit.framework.TestResult$1.protect(TestResult.ja va:106)
at junit.framework.TestResult.runProtected(TestResult .java:124)
at junit.framework.TestResult.run(TestResult.java:109 )
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:2 08)
at junit.framework.TestSuite.run(TestSuite.java:203)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRu nner.runTests(RemoteTestRunner.java:478)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRu nner.run(RemoteTestRunner.java:344)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRu nner.main(RemoteTestRunner.java:196)


Any help will be appreciated. Also any pointer to a tutorial for using @DeclareParents and the entries in the config file will be appreciated. I went thru the example in Reference Documentation, but could not fix the problem.

Best.
- Debasish