Spring 3.1.2: ApplicationEventPublisher not being set

Question

I have a class defined like this:

public class MyClass extends SimpleChannelInboundHandler<DataFrame<ByteBuf>> implements ApplicationEventPublisherAware

(SimpleChannelInboundHandler is an io.netty class.)

Then, in my xml file I define the MyClass like this:

<bean id="MyClass" class="com.mypackage.MyClass" />

According to the documentation:

At configuration time, the Spring container will detect that EmailService implements ApplicationEventPublisherAware and will automatically call setApplicationEventPublisher().

But it's null when I run this.

Any ideas why?

Thanks

what do you mean with "its null"? is the method called with a null argument? — adrobisch

adrobisch adrobisch · Accepted Answer · 2014-06-18T21:35:19

A common usage pattern for ApplicationEventPublisherAware looks like this:

package example;

import org.springframework.stereotype.*;
import org.springframework.context.*;

@Component
public class MyBean implements ApplicationEventPublisherAware {
  ApplicationEventPublisher applicationEventPublisher;

  public void setApplicationEventPublisher(ApplicationEventPublisher applicationEventPublisher) {
    System.out.println("publisher: " + applicationEventPublisher);
    this.applicationEventPublisher = applicationEventPublisher;
  }

  ... (use applicationEventPublisher in methods)
}

You just need to make sure the bean is really added to the context via component scan / configuration / <bean> tag, try to inject it into another bean to check that.

Spring 3.1.2: ApplicationEventPublisher not being set

2 Answers