Refresh a Bean without configuration change with @RefreshScope

Question

I have a @Configuration class as follows:

@Configuration public class SampleKieConfiguration { @Bean public KieServices kieServices() { return KieServices.Factory.get(); } @Bean public KieContainer kieContainer() { ReleaseId releaseId = kieServices().newReleaseId("groupId", "artifactId", "version"); KieContainer kieContainer = kieServices().newKieContainer(releaseId); kieServices().newKieScanner(kieContainer).start(10_000); return kieContainer; } @Bean public KieBase kieBase() { KieBaseConfiguration kieBaseConfiguration = kieServices().newKieBaseConfiguration(); kieBaseConfiguration.setOption(EqualityBehaviorOption.EQUALITY); kieBaseConfiguration.setOption(EventProcessingOption.CLOUD); return kieContainer().newKieBase(kieBaseConfiguration); } }

kieServices().newKieScanner(kieContainer).start(10_000); line basically polls a remote maven repository and refreshes the kieContainer object every 10 seconds, if there's a new artifact.

And in somewhere in my upper layers (such as services layer), I have:

@Service @RefreshScope public class SampleService { @Autowired private KieBase kBase; }

The kBase object is not refreshed (at least not with the new kieContainer object) as far as I can see, when I make a call to /refresh endpoint. I don't have a centralized configuration, and I am getting a warning on it when I call /refresh. What I want to achieve is to have a new kBase object every time kieContainer is refreshed. How can I achieve this? Thanks!

spencergibb · Accepted Answer · 2017-02-24 16:00:26Z

2

Refresh doesn't traverse a hierarchy. It simply clears a cache and on the next reference (via the proxy it creates) the bean is recreated. In your case, since KieBase isn't @RefreshScope, it isn't recreated. So add @RefreshScope to the KieBase declaration. If SampleService doesn't really need to be recreated, remove the @RefreshScope annotation.

answered Feb 24, 2017 at 16:00

spencergibb

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3 Comments

Hasan Can Saral Over a year ago

Thanks, appreciate the answer. But now I am getting java.lang.ClassCastException: $Proxy11 cannot be cast to some.package.KnowledgeBaseImpl. Any thoughts?

dermoritz Over a year ago

is there any way to programmatically refresh the bean? i tried to get the bean from BeanFactory but it holds also the old one (not refreshed.)

spencergibb Over a year ago

There is the ability to refresh a bean by type github.com/spring-cloud/spring-cloud-commons/blob/…

Dirk Hoffmann · Accepted Answer · 2017-02-24 16:08:20Z

as the documentation states:

@RefreshScope works (technically) on an @Configuration class, but it might lead to surprising behaviour: e.g. it does not mean that all the @Beans defined in that class are themselves @RefreshScope. Specifically, anything that depends on those beans cannot rely on them being updated when a refresh is initiated, unless it is itself in @RefreshScope (in which it will be rebuilt on a refresh and its dependencies re-injected, at which point they will be re-initialized from the refreshed @Configuration).

So I guess you'd have to annotate a @RefreshScope also directly on the KieBase @Bean.

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