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rahuld77778584
rahuld77778584
Level 2
January 23, 2019
Solved

Migration of SCR annotations to OSGi R6 annotations in AEM 6.3

  • January 23, 2019
  • 8 replies
  • 9821 views

I am migrating some SCR annotations based code base to OSGi R6.

The current code uses scr annotations and fields which are not available in R6.

For example: @references  and referenceInterface are not supported in R6

@Component

@References({

  @Reference(

  referenceInterface = SomeFactory.class,

  policy = ReferencePolicy.DYNAMIC,

  cardinality = ReferenceCardinality.OPTIONAL_MULTIPLE)

})

@Service

public class SomeResolverImpl implements SomeResolver { }

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    Best answer by Lokesh_Shivalingaiah

    Hi Rahul,

    We dont have @References with r6. Also, @Reference interface doesnt support  'referenceInterace' anymore (Refer this - https://osgi.org/javadoc/r6/residential/org/osgi/service/component/annotations/Reference.html )

    You may have to declare individual references within the class or if you are looking at referring interface, then you may also see if @Designate annotation works.

    8 replies

    smacdonald2008
    smacdonald2008
    Level 10
    January 23, 2019

    The best way to proceed here is to rebuild your project using Maven 12 Archetype. This project uses R6 annotations by default.

    Creating an Adobe Experience Manager 6.3 Project using Adobe Maven Archetype 12

    Notice in this article the use of 6.3 UBER JAR.

    Ratna_Kumar
    Ratna_Kumar
    Level 10
    January 23, 2019

    Hi Rahul,

    As Scott stated, the best way to learn how to use R6 annotations from the article: Creating an Adobe Experience Manager 6.3 Project using Adobe Maven Archetype 12

    Make sure you include Uber Jar in POM xml file.

    Thanks,

    Ratna Kumar.

    smacdonald2008
    smacdonald2008
    Level 10
    January 23, 2019

    Also -- here is a good overview of R6 - Official OSGi Declarative Services Annotations in AEM - Adobe Experience Manager | AEM/CQ | Apache Sling

    rahuld77778584
    rahuld77778584Author
    Level 2
    January 23, 2019

    smacdonald2008 Ratna Kumar

    Thanks for the reply. I have already checked articles you guys suggested.

    However, I am not able to find suitable annotations and field which were available in scr.

    Can you answer my specific question?

    @references  and referenceInterface are not supported in R6. How do I re implement it in R6?

    smacdonald2008
    smacdonald2008
    Level 10
    January 23, 2019

    In R6 - you can use @Reference. The fully qualified package is

    //DS Annotations

    import org.osgi.service.component.annotations.Component;

    import org.osgi.service.component.annotations.Reference;

    This works the same way - it injects an AEM Service. That way, you can use a service like DataSourcePool:

       

        @Reference

        private DataSourcePool source;

                   

    The other one you mention not in R6.

    https://osgi.org/javadoc/r4v43/cmpn/org/osgi/service/component/annotations/package-summary.html

    To see a step by step articel that uses @Reference - see this AEM 6.4 one that uses DataSourcePool

    Adobe Experience Manager Help | Querying MySQL data using an Adobe Experience Manager 6.4 DataSourcePool

    In fact - most of our AEM 6.4 articles use R6 annotations.

    Hope this helps.... 

    rahuld77778584
    rahuld77778584Author
    Level 2
    January 23, 2019

    If you see my example, I need to use @reference at class level. (Which was possible in SCR)

    I am able to use it at field level i.e. injecting OSGi service using @reference on a field.

    smacdonald2008
    smacdonald2008
    Level 10
    January 23, 2019

    Read here too - talks about @Refenence:

    Using OSGi R6 annotations (>= AEM6.2) - Experience Delivers

    Here is a good piece of information that should help you --

    https://blog.osoco.de/2016/05/migrating-from-the-apache-felix-scr-annotations-to-the-osgi-declarative-services-annotatio…

    It talks migrating from SRC annotations to R6.

    Looks like @References is not supported in R6.

    Lokesh_Shivalingaiah
    Lokesh_ShivalingaiahAccepted solution
    Level 10
    January 23, 2019

    Hi Rahul,

    We dont have @References with r6. Also, @Reference interface doesnt support  'referenceInterace' anymore (Refer this - https://osgi.org/javadoc/r6/residential/org/osgi/service/component/annotations/Reference.html )

    You may have to declare individual references within the class or if you are looking at referring interface, then you may also see if @Designate annotation works.

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