Problem with the Sample Spring AOP application

[Keerthi Kumar]

Dear all,

I am new to spring aop and trying to execute one sample program from the net. But I am getting the below error:

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'businesslogicbean' defined in file [D:\kk_workspace\SpringAOP\build\springconfig.xml]: Initialization of bean failed; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert property value of type [java.lang.String] to required type [java.lang.Class[]] for property 'proxyInterfaces'; nested exception is java.lang.IllegalArgumentException: Cannot find class [IBusinessLogic]. Root cause: java.lang.ClassNotFoundException: IBusinessLogic
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:547)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:485)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:455)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:251)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:169)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:248)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:170)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:407)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:735)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:369)
	at org.springframework.context.support.FileSystemXmlApplicationContext.<init>(FileSystemXmlApplicationContext.java:124)
	at org.springframework.context.support.FileSystemXmlApplicationContext.<init>(FileSystemXmlApplicationContext.java:68)
	at com.Spring.AOP.Demo.SpringAOPDemo.main(SpringAOPDemo.java:10)
Caused by: org.springframework.beans.TypeMismatchException: Failed to convert property value of type [java.lang.String] to required type [java.lang.Class[]] for property 'proxyInterfaces'; nested exception is java.lang.IllegalArgumentException: Cannot find class [IBusinessLogic]. Root cause: java.lang.ClassNotFoundException: IBusinessLogic
	at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:395)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1313)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1285)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1042)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539)
	... 13 more
Caused by: java.lang.IllegalArgumentException: Cannot find class [IBusinessLogic]. Root cause: java.lang.ClassNotFoundException: IBusinessLogic
	at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:252)
	at org.springframework.beans.propertyeditors.ClassArrayEditor.setAsText(ClassArrayEditor.java:66)
	at org.springframework.beans.TypeConverterDelegate.doConvertTextValue(TypeConverterDelegate.java:341)
	at org.springframework.beans.TypeConverterDelegate.doConvertValue(TypeConverterDelegate.java:325)
	at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:192)
	at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:138)
	at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:390)

springConfig.xml:

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

<beans>

  <!--CONFIG-->
  <bean id="businesslogicbean"
  class="org.springframework.aop.framework.ProxyFactoryBean">
    <property name="proxyInterfaces">
      <value>IBusinessLogic</value>
    </property>
    <property name="target">
      <ref local="beanTarget"/>
    </property>
    <property name="interceptorNames">
      <list>
        <value>theTracingBeforeAdvisor</value>
        <value>theTracingAfterAdvisor</value>
      </list>
    </property>
  </bean>

  <!--CLASS-->
  <bean id="beanTarget"
  class="BusinessLogic"/>

  <!--ADVISOR-->
  <!--Note: An advisor assembles pointcuts and advice-->
  <bean id="theTracingBeforeAdvisor"
  class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">
    <property name="advice">
      <ref local="theTracingBeforeAdvice"/>
    </property>
    <property name="pattern">
      <value>.*</value>
    </property>
  </bean>
  
  <!--ADVISOR-->
  <!--Note: An advisor assembles pointcuts and advice-->
  <bean id="theTracingAfterAdvisor"
  class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">
    <property name="advice">
      <ref local="theTracingAfterAdvice"/>
    </property>
    <property name="pattern">
      <value>.*</value>
    </property>
  </bean>

  <!--ADVICE-->
  <bean id="theTracingBeforeAdvice"
  class="TracingBeforeAdvice"/>
  <bean id="theTracingAfterAdvice"
  class="TracingAfterAdvice"/>
</beans>

Request you all to please help me out to resolve this issue.

Thanks,
Keerthi Kumar N

[David Newton]

Caused by: java.lang.IllegalArgumentException: Cannot find class [IBusinessLogic]. Root cause: java.lang.ClassNotFoundException: IBusinessLogic

Where's that class?

[Keerthi Kumar]

Hi,

I have made an entry for IBusinessLogic (which is an interface).

[David Newton]

Yeah, okay, but where is it? Is it in a package? Is it being deployed? Because it's not there at runtime--that's why you're getting the error message.

[Keerthi Kumar]

Hi,

Yes. I had defined that java file in the same package. Also injected in the springConfig.xml too.

[David Newton]

*What* package?

[Keerthi Kumar]

Hi,

It is being defined in the following package: package com.Spring.AOP.Demo;

[David Newton]

Okay, why wouldn't you use the fully-qualified class name in the Spring config? It's not going to *guess* where the class is.