Spring Aspect doesn't work if bean is instantiated manually first - spring

Question

I have a simple aspect like below
#Aspect
public class PersistentAspect {
#AfterReturning("#annotation(org.aspect.PersistentOperation)")
public void log(JoinPoint jp) {
System.out.println("aspect call");
}
}
and an AppConfig like below
public class AppConfig {
private Integer num;
private String text;
public Integer getNum() {
return num;
}
#PersistentOperation
public void setNum(Integer num) {
this.num = num;
}
public String getText() {
return text;
}
#PersistentOperation
public void setText(String text) {
this.text = text;
}
}
And configuration class like below
#EnableWs
#Configuration
public class WsConfig extends WsConfigurerAdapter {
#Override
public void addInterceptors(List<EndpointInterceptor> interceptors) {
AppConfig config = config();
interceptors.add(new CustomValidatingInterceptor(schema(), null));
}
#Bean
public AppConfig config() {
AppConfig config = null;
config = new AppConfig();
return config;
}
#Bean
public PersistentAspect persistentAspect() {
PersistentAspect persistentAspect = new PersistentAspect();
return persistentAspect;
}
}
If I use below in the addInterceptors
AppConfig config = config();
The Aspect will not work. The obvious solution I have is to change the code to
AppConfig config = new AppConfig();
Now what I want to understand is, is there a config in which AppConfig config = config(); could still be made working. I assume that when spring initiates the Bean, it can make an AOP proxy of the AppConfig, and when I initiate the bean it interferes with that process somehow. What is the spring/spring-boot way of handling this?
Below is the pom.xml, so basically latest Spring 5.0.5
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web-services</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
Edit-1
Before posting the I had already adding a #EnableAspectJAutoProxy, but that had not helped.
The git repo to try the issue is on below
https://github.com/tarunlalwani/spring-aop-so-50084308

Answer 1

Your AppConfig bean (which you initialize, correctly, using a method annotated with #Bean) needs to be wrapped in a proxy that then executes the aspect logic.
You have to enable this behavior by adding the #EnableAspectJAutoProxy annotation to your WsConfig class.
By the way: it is totally correct to use
AppConfig config = config();
in your addInterceptors method. Spring will return the bean that was created by the config method.