java.lang.IllegalStateException: ApplicationEventMulticaster not initialized...

[AFiQ125zR]

My config class

package my.component.config;

import my.component.client.DataRepositoryImpl;
import my.component.domain.DataRepository;

import org.springframework.config.java.annotation.Bean;
import org.springframework.config.java.annotation.Configuration;
import org.springframework.config.java.annotation.ExternalValue;
import org.springframework.config.java.annotation.valuesource.PropertiesValueSource;

@Configuration
@PropertiesValueSource(locations={"classpath:my/component/config/my.properties"})
public class AppConfig 
{
	@ExternalValue("user.name")
	private String name;
	
	@ExternalValue("user.address")
	private String address;
	
	@Bean
	public DataRepository dataRepository()
	{
		return new DataRepositoryImpl(name, address);
	}
}

My main class

package my.component.client;

import my.component.config.AppConfig;
import my.component.domain.DataRepository;

import org.springframework.config.java.context.JavaConfigApplicationContext;

public class Client 
{
	private JavaConfigApplicationContext ctx;
	
	public Client() 
	{
		ctx = new JavaConfigApplicationContext(AppConfig.class);
	}

	public void execute()
	{
		DataRepository info = ctx.getBean(DataRepository.class);
		
		System.out.println(info.retrieveInfo());
	}
	
	public static void main(String[] args) 
	{
		Client client = new Client();
		
		client.execute();
	}
}

Exception in thread "main" java.lang.IllegalStateException: ApplicationEventMulticaster not initialized - call 'refresh' before multicasting events via the context: org.springframework.config.java.context.JavaConfigApplicationContext@87816d: startup date [Thu Feb 11 18:23:50 SGT 2010]; root of context hierarchy
	at org.springframework.context.support.AbstractApplicationContext.getApplicationEventMulticaster(AbstractApplicationContext.java:307)
	at org.springframework.context.support.AbstractApplicationContext.addListener(AbstractApplicationContext.java:827)
	at org.springframework.context.support.AbstractApplicationContext.addApplicationListener(AbstractApplicationContext.java:367)
	at org.springframework.config.java.internal.process.InternalConfigurationPostProcessor.wrapInternalBeanFactoryInApplicationContext(InternalConfigurationPostProcessor.java:103)
	at org.springframework.config.java.internal.process.InternalConfigurationPostProcessor.createInternalBeanFactory(InternalConfigurationPostProcessor.java:91)
	at org.springframework.config.java.internal.process.InternalConfigurationPostProcessor.postProcessBeanFactory(InternalConfigurationPostProcessor.java:74)
	at org.springframework.config.java.context.JavaConfigApplicationContext.invokeBeanFactoryPostProcessors(JavaConfigApplicationContext.java:121)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:398)
	at org.springframework.config.java.context.JavaConfigApplicationContext.<init>(JavaConfigApplicationContext.java:80)
	at my.component.client.Client.<init>(Client.java:14)
	at my.component.client.Client.main(Client.java:26)

What happen here? Can anyone explain this?