[CAMEL-17492] CamelBeanPostProcessor fails if @Producer is used in EventNotifier

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.12.0, 3.13.0, 3.14.0
• Fix Version/s: 3.14.1, 3.15.0
• Component/s: camel-core, camel-spring-boot
• Estimated Complexity: Unknown
• Assignee: Claus Ibsen
• Reporter: Michael Rambichler
• Created: 14/Jan/22 15:25
• Updated: 28/Jan/22 08:07
• Resolved: 15/Jan/22 08:50

Description

If you use a @Produce annotation in an EventNotifier Camel fails at startup.

Reproducable with: Custom EventNotifier in a plain Camel + Springboot Routebuilder.
I have reproduced it with the spring boot example: https://github.com/apache/camel-spring-boot-examples/tree/main/spring-boot and added the EventNotifier below.
 
Fails since Camel > 3.11
 
Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error post processing bean: testEventNotifier; nested exception is java.lang.NullPointerException
....
Caused by: org.springframework.beans.factory.BeanCreationException: Error post processing bean: testEventNotifier; nested exception is java.lang.NullPointerException
at org.apache.camel.spring.spi.CamelBeanPostProcessor.postProcessBeforeInitialization(CamelBeanPostProcessor.java:160) ~[camel-spring-3.14.0.jar:3.14.0]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:440) ~[spring-beans-5.3.14.jar:5.3.14]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1796) ~[spring-beans-5.3.14.jar:5.3.14]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:620) ~[spring-beans-5.3.14.jar:5.3.14]
... 122 common frames omitted

 

 

Example

https://github.com/apache/camel-spring-boot-examples/tree/main/spring-boot and added the EventNotifier below.

TestEventNotifier.java

 

@Component
public class TestEventNotifier extends EventNotifierSupport {

   @Produce("stream:out")
   TestProducer producer;

   @Override
   public void notify(CamelEvent event) throws Exception {
      System.err.println(event);
      //producer.publish("some notification");
   }
}

---------------------------------------------------

TestProducer.java:

import org.apache.camel.InOnly;

@InOnly
public interface TestProducer {
   void publish(String event);
}