BeanFactoryPostProcessor allows client code to customize bean definitions. The method BeanFactoryPostProcessor.postProcessBeanFactory is called by Spring startup process just after all bean definitions have been loaded, but no beans have been instantiated yet.
The configuration class
package com.logicbig.example;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class MyConfig {
@Bean
public static MyBeanFactoryPostProcessor myConfigBean() {
return new MyBeanFactoryPostProcessor();
}
}
Implementing BeanFactoryPostProcessor
In this example we are registering a new bean instance programmatically.
package com.logicbig.example;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.support.GenericBeanDefinition;
public class MyBeanFactoryPostProcessor implements BeanFactoryPostProcessor {
@Override
public void postProcessBeanFactory(
ConfigurableListableBeanFactory beanFactory)
throws BeansException {
GenericBeanDefinition bd = new GenericBeanDefinition();
bd.setBeanClass(MyBean.class);
bd.getPropertyValues().add("strProp", "my string property");
((DefaultListableBeanFactory) beanFactory)
.registerBeanDefinition("myBeanName", bd);
}
}
The bean
package com.logicbig.example;
public class MyBean {
private String strProp;
public void setStrProp(String strProp) {
this.strProp = strProp;
}
public void doSomething() {
System.out.println("from MyBean: " + strProp);
}
}
The Main class
package com.logicbig.example;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class BeanFactoryPostProcessorExample {
public static void main(String[] args) {
AnnotationConfigApplicationContext context =
new AnnotationConfigApplicationContext(MyConfig.class);
MyBean bean = context.getBean(MyBean.class);
bean.doSomething();
}
}
Outputfrom MyBean: my string property
Example ProjectDependencies and Technologies Used: - spring-context 6.2.12 (Spring Context)
Version Compatibility: 3.2.3.RELEASE - 6.2.12 Version compatibilities of spring-context with this example: Versions in green have been tested.
- JDK 25
- Maven 3.9.11
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