Problem

Using Spring3 @Configuration to create an application configuration file like below :

import org.springframework.context.annotation.Configuration;
 
@Configuration
public class AppConfig {
 
	@Bean
   //...
 
}

However, when run it, it hits following error message :

org.springframework.context.support.AbstractApplicationContext prepareRefresh
//...
Exception in thread "main" java.lang.IllegalStateException: 
CGLIB is required to process @Configuration classes. 
Either add CGLIB to the classpath or remove the following 
@Configuration bean definitions: [appConfig]
//...
at com.mkyong.core.App.main(App.java:12)

Solution

To use @Configuration in Spring 3, you need to include the CGLIB library manually, just declares it in Maven pom.xml file.

	<dependency>
		<groupId>cglib</groupId>
		<artifactId>cglib</artifactId>
		<version>2.2.2</version>
	</dependency>
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