Spring BeanPostProcessor BeanCreationException runtime error - spring

Question

I'm unable to launch hello world app with Spring 4.3.6 Please, help, I don't even know what may be wrong.
Without bean messageService and aop section everything works. But I got this error with config as it is
WARNING: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'printer' defined in class path resource [config.xml]: BeanPostProcessor before instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.aop.aspectj.AspectJPointcutAdvisor#0': Cannot create inner bean '(inner bean)#c273d3' of type [org.springframework.aop.aspectj.AspectJMethodBeforeAdvice] while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#c273d3': Cannot create inner bean '(inner bean)#1423665' of type [org.springframework.aop.config.MethodLocatingFactoryBean] while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#1423665': Initialization of bean failed; nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [MessagePrinterService] for bean with name 'messageService' defined in class path resource [config.xml]; nested exception is java.lang.ClassNotFoundException: MessagePrinterService
Related cause: org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [MessagePrinterService] for bean with name 'messageService' defined in class path resource [config.xml]; nested exception is java.lang.ClassNotFoundException: MessagePrinterService
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'printer' defined in class path resource [config.xml]: BeanPostProcessor before instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.aop.aspectj.AspectJPointcutAdvisor#0': Cannot create inner bean '(inner bean)#c273d3' of type [org.springframework.aop.aspectj.AspectJMethodBeforeAdvice] while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#c273d3': Cannot create inner bean '(inner bean)#1423665' of type [org.springframework.aop.config.MethodLocatingFactoryBean] while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#1423665': Initialization of bean failed; nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [MessagePrinterService] for bean with name 'messageService' defined in class path resource [config.xml]; nested exception is java.lang.ClassNotFoundException: MessagePrinterService
Related cause: org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [MessagePrinterService] for bean with name 'messageService' defined in class path resource [config.xml]; nested exception is java.lang.ClassNotFoundException: MessagePrinterService
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:479)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
Xml config:
<?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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd">
<bean id="printer" class="helloword.MessagePrinter">
<constructor-arg ref="message"></constructor-arg>
</bean>
<bean id="message" class="helloword.HelloWordMessage">
<constructor-arg value="Hello Spring World!"></constructor-arg>
</bean>
<bean id="messageService" class="MessagePrinterService">
</bean>
<aop:config>
<aop:aspect ref="messageService">
<aop:pointcut id="print" expression="execution(* *.print(..))"/>
<aop:before pointcut-ref="print" method="preMsg"/>
<aop:after pointcut-ref="print" method="postMsg"/>
</aop:aspect>
</aop:config>
</beans>
Classes, all is separate files:
public class HelloWordMessage implements Message{
private String msg;
public HelloWordMessage(String s) {
msg = s;
}
#Override
public String getText() {
return msg;
}
}
public class MessagePrinter implements Printer {
private Message msg;
public MessagePrinter(Message m){
msg = m;
}
#Override
public void print(){
System.out.println(msg.getText());
}
}
public class MessagePrinterService {
public MessagePrinterService(){
System.out.println("MessagePrinterService created");
}
public void preMsg(){
System.out.println("Message alert!:");
}
public void postMsg(){
System.out.println("End of message.");
}
}
public class Aplication {
public static void main(String[] args) {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("config.xml");
MessagePrinter printer = context.getBean(MessagePrinter.class);
printer.print();
context.close();
}
}

Answer 1

java.lang.ClassNotFoundException: MessagePrinterService
Spring cannot load the class MessagePrinterService.
Put it into a specific package and change the configuration accordingly. It should work then.