topic How to use "injected" services ? in Talend Studio

How to use "injected" services ?

FTB — Fri, 02 Jan 2026 14:45:42 GMT

Hi, I am no Java expert but I want some help to make a custom component. It's a processor component.

I got some questions here :

How to use injected services ? I try to find how but can't find a real answer.

For example, I want to use the RecordBuilderFactory. I can't create an instance of it since it's a interface and also there is this recommandation :

" If you create the instances yourself, you cannot benefit from these features, nor from the memory optimization done by the runtime. Prefer reusing the framework instances over custom ones. "

So there may be already existing instances of them.

If I declare a variable and use a method, I got the NULL pointer exception.

What I really want to know is how to create a Record( using string or any other type for example). In the documentation, there is an example :

public Record createRecord() {

return factory.newRecordBuilder()

.withString("name", "Gary")

.withDateTime("date", ZonedDateTime.of(LocalDateTime.of(2011, 2,

6, 8, 0), ZoneId.of("UTC")))

.build();

}

There is no explanation on how to have the factory instance.

And there is this recommandation :

" Record is a Java interface but never implement it yourself to ensure

compatibility with the different Talend products. Follow the guidelines

below. " means I should not implement myself the interfaces.

Re: How to use "injected" services ?

undx — Fri, 17 Sep 2021 09:37:52 GMT

Hi @Fabrice Balan ,

You don't have to create services by hand, just use the annotation `@Service` ( https://github.com/Talend/component-runtime/blob/master/component-api/src/main/java/org/talend/sdk/component/api/service/Service.java ) .

Here's a sample usage : https://github.com/Talend/connectors-se/blob/master/couchbase/src/main/java/org/talend/components/couchbase/service/CouchbaseService.java#L79-L83

Hope that it will help...

Best regards.

Re: How to use "injected" services ?

FTB — Fri, 17 Sep 2021 10:00:51 GMT

Thanks for your answer.

Should I declare them in Service class ?

Re: How to use "injected" services ?

undx — Thu, 23 Sep 2021 07:00:09 GMT

Hi @Fabrice Balan ,

Not necessary but usually in your business logic modules.

best regards.

Re: How to use "injected" services ?

FTB — Tue, 28 Sep 2021 12:19:08 GMT

Thank you