[jira] [Commented] (KARAF-6727) @Reference always null in business delegate

["Jean-Baptiste Onofré (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KARAF-6727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17111274#comment-17111274 ] 

Jean-Baptiste Onofré commented on KARAF-6727:
---------------------------------------------

Are you using SCR ? If you want to use SCR @Reference, you need @Component.

Instead of using JAXRS Whiteboard you can use directly SCR for REST as shown here: [https://github.com/apache/karaf/tree/master/examples/karaf-rest-example/karaf-rest-example-scr]

> @Reference always null in business delegate
> -------------------------------------------
>
>                 Key: KARAF-6727
>                 URL: https://issues.apache.org/jira/browse/KARAF-6727
>             Project: Karaf
>          Issue Type: Question
>          Components: karaf
>    Affects Versions: 4.2.8
>            Reporter: Nicolas Duminil
>            Assignee: Jean-Baptiste Onofré
>            Priority: Minor
>
> Hello,
> In a REST service deployed on Karaf 4.28, I'm trying to use a business delegate. The REST service starts well and I'm able to display the WADL, etc. But the business delegate reference is always null. Here is a code excerpt:
>     {color:#9e880d}@Path{color}({color:#067d17}"/customers"{color})
> {color:#9e880d}    @Produces{color}({color:#067d17}"application/xml"{color})
> {color:#9e880d}    @Consumes{color}({color:#067d17}"application/xml"{color})
> {color:#0033b3}    public class {color}{color:#000000}CustomerAPI
> {color}    {
>       {color:#9e880d}@Reference
> {color}      {color:#0033b3}private {color}{color:#000000}CustomerDataService {color}{color:#871094}customerDataService{color};
>       {color:#9e880d}@GET
> {color}      {color:#0033b3}public {color}{color:#000000}Response {color}{color:#00627a}getCustomers{color}()
>       {
>         {color:#0033b3}return {color}{color:#000000}Response{color}.ok().entity({color:#000000}Objects{color}.requireNonNull({color:#871094}customerDataService{color}, {color:#067d17}"CustomerDataService is null"{color}).getCustomers().stream().map({color:#000000}CustomerDto{color}:: {color:#0033b3}new{color}).collect({color:#000000}Collectors{color}.toList())).build();
>       }
>     ...
>     }
> Here above, an NPE is raised as the customersDataService property is null. The logfile displays the following:
>     java.lang.NullPointerException: CustomerDataService is null
>     at java.util.Objects.requireNonNull(Objects.java:246) ~[?:?]
>     at  fr.simplex_software.red_hat.fuse.osgi.standalone.customers.rest.CustomerAPI.getCustomers(CustomerAPI.java:26) ~[?:?]
> ...
> What did I miss here ? Many thanks in advance.
> Kind regards,
> Nicolas



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