@Reference(“(service.label=TESTCALL)”) Felix SCR annotation error | Community
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K
Kkkrish
Level 4
March 9, 2017
Solved

@Reference(“(service.label=TESTCALL)”) Felix SCR annotation error

  • March 9, 2017
  • 16 replies
  • 7633 views

am trying to implement an OSGI service which can serve me as ConfigurationFactory the service implementation has just two properties as shown below.

@Property(value="this is service variable property value") static final String MY_SERVICE_VARIABLE = "service.variable"; @Property(description="Label for this MyService") private static final String MY_SERVICE_LABEL = "service.label";

and am retrieving this service configuration data from an OSGI servlet where i am trying to call this service by below code which compiles fine and retrieves data randomly from the multiple service configuration.

@Reference MyService myservice;


But when i wanted to get each configuration data by using the service.label and am calling the service by using below code snippet in my OSGI servlet, while compiling am facing the below Error.

@Reference("(service.label=TESTCALL)") MyService myservice;


cannot find symbol [ERROR] symbol: method value() [ERROR] location: @interface org.apache.felix.scr.annotations.Reference.

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    Best answer by smacdonald2008

    Daniel is correct - i went through this and this works: 

    public class SimpleServlet extends org.apache.sling.api.servlets.SlingAllMethodsServlet {
         private static final long serialVersionUID = 2598426539166789515L;
            
         @Reference(target = "(mailservice.label=InternetA)")
         MailService mailService;    

    We are turning this all into a HELPX Article so all the steps are included. 

    16 replies

    Daniel_H__A__Li
    Daniel_H__A__Li
    Level 2
    March 9, 2017

    Hi.

    Have you tried

    @Reference(target = "(service.label=TESTCALL)")

    instead?

    @Reference annotation

    Regards,

    Daniel.

    Feike_Visser1
    Adobe Employee
    Feike_Visser1Adobe Employee
    Adobe Employee
    March 9, 2017

    Why are you not setting these properties on the @Component annotation?

    K
    KkkrishAuthor
    Level 4
    March 9, 2017

    Feike Visser wrote...

    Why are you not setting these properties on the @Component annotation?

     

    Hi Feike Visser,

    1. @Reference("(service.label=TESTCALL)")
    2. MyService myservice;

    This above code snippet i am using in a servlet where i need to create a service reference that is being used to call for retrieving configuration data from OSGI FELIX Factory console, am referring https://cqdump.wordpress.com/2014/08/05/managing-multiple-instances-of-services-osgi-service-factories/ this article to create multiple instances of services via OSGI Service Factory. where as with above code its giving compilation error. and without any parameter to @Reference annotation it is compiled.

    Is there any way that can help me in achieving  " how to retrieve OSGI multi services data from Service factory " ?

     

    Kk

    smacdonald2008
    smacdonald2008
    Level 10
    March 9, 2017

    In your use case - are you setting up multiple service configurations - as opposed to 1 service with 1 configuration. This is an interesting use case. We do not have any examples on this. 

    I will go through this too and see if I get the same results. Maybe something needs to be updated. I will post back. 

    Daniel_H__A__Li
    Daniel_H__A__Li
    Level 2
    March 9, 2017
            Hi, Kk. As I've said before, you are missing the attribute called "target" in the annotation. @Reference doesn't accept an attribute called "value" (the default one). You must use target = "your LDAP filter to selected a specific service component". It's very straigthforward... Regards, Daniel.
    smacdonald2008
    smacdonald2008Accepted solution
    Level 10
    March 9, 2017

    Daniel is correct - i went through this and this works: 

    public class SimpleServlet extends org.apache.sling.api.servlets.SlingAllMethodsServlet {
         private static final long serialVersionUID = 2598426539166789515L;
            
         @Reference(target = "(mailservice.label=InternetA)")
         MailService mailService;    

    We are turning this all into a HELPX Article so all the steps are included. 

    K
    KkkrishAuthor
    Level 4
    March 9, 2017

    Daniel Henrique Alves Lima wrote...

    Hi, Kk. As I've said before, you are missing the attribute called "target" in the annotation. @Reference doesn't accept an attribute called "value" (the default one). You must use target = "your LDAP filter to selected a specific service component". It's very straigthforward... Regards, Daniel.

     

    Hi Daniel,

    This works, sorry to post back very late.

    Regards,

    Kkkrish

    Var
    Var
    Level 4
    March 9, 2017

    Hi Kkkrish,

    As Daniel mentioned this should work, i have used it in one of my POC learnings, have uploaded the code at my github for your reference.

    @Reference(target = "(service.label=TESTCALL)")

    ~VAr

      Daniel_H__A__Li
      Daniel_H__A__Li
      Level 2
      March 9, 2017
      No problem, kk. I've done something similar before. It's also possible to dynamically set the target property (making the value used as a LDAP filter configurable), but I'm far away from my computer to send you a running sample. Regards, Daniel.
      K
      KkkrishAuthor
      Level 4
      March 9, 2017

      Daniel Henrique Alves Lima wrote...

      No problem, kk. I've done something similar before. It's also possible to dynamically set the target property (making the value used as a LDAP filter configurable), but I'm far away from my computer to send you a running sample. Regards, Daniel.

       

      Thanks Daniel, providing running sample would be great help.

      Regards,

      Kk

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