Injecting CDI Bean into Camel RouteBuilder

[ozkin]

Invoking a Bean component from a Camel component is not a problem in Switchyard, if you use a component reference and invoke the bean via to("switchyard://BeanService").

But what if you want to use bean's methods directly in the route's code for one reason or another, for example as below. Is it then possible to simply inject a bean?

    @Inject

    private InternalService service;

    public void configure() {

        from("switchyard://CamelTestService")

            .log("CAMEL!!!")

            .process(new Processor() {

                @Override

                public void process(Exchange exchange) throws Exception {

                    service.foo(); // <- here service is null !!

                }

            });

    }

It doesn't work for me. It seems InternalService doesn't get injected. At least, when this route is invoked, "service" is null.

Similar approach works fine for Bean switchyard components.

I attached a complete project. SwitchYard is 1.1.

[igarashitm]

You may want to take a look at this quickstart - https://github.com/jboss-switchyard/switchyard/blob/master/quickstarts/demos/multiApp/web/src/main/resources/META-INF/switchyard.xml

It's injecting SwitchYard service reference into  ItemEntry, a plain CDI bean. Note that the ItemEntry is specified as a SwitchYard bean service in the switchyard.xml. It's required to get service reference injected.

However, if you just want to use that bean as a plain CDI bean but not as a SwitchYard service reference, then you just need to add @Named onto that CDI bean and use bean ref in the route.

Apache Camel: Bean

[ozkin]

Yes, the idea was to use a bean as a plain CDI bean. And I know that .to("bean: and .bean( works fine in Camel route. But intention was to use a bean as a java object in the code, as I demonstrated in the original post. Imagine there is more complex logic and you need to invoke different methods on a bean inside the route, say inside Processor(), or inside different statements, like setHeader(), setBody(), to() and whatnot. Sometimes it might be useful when such a bean represents a configuration service and you are getting different parameters.

I could solve this issue by doing: private InternalService service = new InternalService();

but I wanted to do this with injection instead.

[igarashitm]

It's not possible right now because SwitchYard runtime instantiates the RouteBuilder class directly. In order to do that we would need to add an option to lookup a RouteBuilder instance from BeanManager like we're already doing for transformer/validator. Feel free to file a enhancement JIRA.

[igarashitm]

Filed a JIRA - [SWITCHYARD-2904] Enable CDI resolution for camel service Java DSL - JBoss Issue Tracker