Get osgi service reference from pure osgi bundle in Liferay portlet

Question

I have successfully register the org.amdatu.mongo service in apche felix like shown below,

Bundle is shown below which export the service which is in active/running state.

Now I want to use this service in my portlet and I have return below code,

 package com.example.portlet;
import com.liferay.portal.kernel.portlet.bridges.mvc.MVCPortlet;

import java.io.IOException;

import javax.portlet.Portlet;
import javax.portlet.PortletException;
import javax.portlet.RenderRequest;
import javax.portlet.RenderResponse;

import org.amdatu.mongo.MongoDBService;
import org.apache.felix.dm.annotation.api.ServiceDependency;
import org.osgi.service.component.annotations.Component;
@Component(
    immediate = true,
    property = {
        "com.liferay.portlet.display-category=category.sample",
        "com.liferay.portlet.instanceable=true",
        "javax.portlet.display-name=loveworld Portlet",
        "javax.portlet.init-param.template-path=/",
        "javax.portlet.init-param.view-template=/view.jsp",
        "javax.portlet.resource-bundle=content.Language",
        "javax.portlet.security-role-ref=power-user,user"
    },
    service = Portlet.class
)
public class LoveworldmvcportletPortlet extends MVCPortlet {
     @ServiceDependency
     private volatile MongoDBService m_mongoDbService;



    @Override
    public void doView(RenderRequest renderRequest, RenderResponse renderResponse)
            throws IOException, PortletException {
        System.out.println( m_mongoDbService);//**getting NULL**
        super.doView(renderRequest, renderResponse);
    }
}

I have tried with annotation @ServiceDependency no luck getting null.My mongoDb server is running fine!!

I have Menifest.mf file as below,

Manifest-Version: 1.0

Bnd-LastModified: 1469380000381

Bundle-ManifestVersion: 2

Bundle-Name: loveworld

Bundle-SymbolicName: loveworld

Bundle-Version: 1.0.0

Created-By: 1.8.0_51 (Oracle Corporation)

Import-Package: com.liferay.portal.kernel.portlet.bridges.mvc;version=

 "[1.0,2)",javax.portlet;version="[2.0,3)",javax.servlet,javax.servlet

 .http,org.amdatu.mongo;version="1.0.0"

Javac-Debug: on

Javac-Deprecation: off

Javac-Encoding: UTF-8

Private-Package: com.example.portlet,content

Provide-Capability: osgi.service;objectClass:List<String>="javax.portl

 et.Portlet",liferay.resource.bundle;bundle.symbolic.name=loveworld;re

 source.bundle.base.name="content.Language"

Require-Capability: osgi.extender;filter:="(&(osgi.extender=jsp.taglib

 )(uri=http://java.sun.com/portlet_2_0))",osgi.extender;filter:="(&(os

 gi.extender=jsp.taglib)(uri=http://liferay.com/tld/aui))",osgi.extend

 er;filter:="(&(osgi.extender=jsp.taglib)(uri=http://liferay.com/tld/p

 ortlet))",osgi.extender;filter:="(&(osgi.extender=jsp.taglib)(uri=htt

 p://liferay.com/tld/theme))",osgi.extender;filter:="(&(osgi.extender=

 jsp.taglib)(uri=http://liferay.com/tld/ui))",osgi.ee;filter:="(&(osgi

 .ee=JavaSE)(version=1.8))"

Service-Component: OSGI-INF/com.example.portlet.LoveworldmvcportletPor

 tlet.xml

Tool: Bnd-3.2.0.201605172007

bnd.bnd file is as below,

Bundle-SymbolicName: loveworld
Bundle-Version: 1.0.0
Import-Package: com.liferay.portal.kernel.portlet.bridges.mvc;version="[1.0,2)",javax.portlet;version="[2.0,3)",javax.servlet,javax.servlet.http,org.amdatu.mongo;version="1.0.0"

Portlet which consume the service is as shown below,

But here it shows that we can use directly take a look.http://www.amdatu.org/components/mongodb.html — Abhishek Suthar, Jul 25 '16 at 03:01

score 1 · Answer 1 · answered Jul 24 '16 at 18:36

1

You are using the following two annotations:

import org.apache.felix.dm.annotation.api.ServiceDependency;
import org.osgi.service.component.annotations.Component;

One of them is the standard OSGi annotation for Declarative Services components, the other one from the Felix Dependency Manager project. Be sure that you use annotations only from org.osgi.service.component.annotations package.

Also, you should add a bind method to your component for the service reference.

answered Jul 24 '16 at 18:36

Balazs Zsoldos

6,036
2
23
31

Thanks for the reply Balazs.Understand your point...It would be helpful if you provide two or three line code... – Abhishek Suthar Jul 24 '16 at 18:56
I have tried with bundleActivator interface by implementing start stop method just for verification..return the code to get the mongoservice ...but In that case also Im getting null. – Abhishek Suthar Jul 24 '16 at 19:04
Here is a tutorial for Declarative Services: http://enroute.osgi.org/services/org.osgi.service.component.html – Balazs Zsoldos Jul 25 '16 at 06:14
Its saying use reference annotation ...for any service but still im getting null – Abhishek Suthar Jul 25 '16 at 13:30
Do you have a bind method for the member variable (e.g.: a setter)? Did you specify the annotation on the bind method? – Balazs Zsoldos Jul 25 '16 at 13:33
Means I have to define bind method as well in addition to reference annotation? Can you provide snippet for the same... – Abhishek Suthar Jul 25 '16 at 14:14
If you put the Reference annotation over a setter, the setter will be handled as the bind method. It means, that the setter will be called during the activation of the component. – Balazs Zsoldos Jul 25 '16 at 14:17
I have to create setter ?Right...Ill do that and update the question – Abhishek Suthar Jul 25 '16 at 14:20
You don't need a bind method if you are using DS 1.3. Direct injection into fields is supported. – Neil Bartlett Jul 26 '16 at 07:09

score 0 · Accepted Answer · answered Jul 24 '16 at 20:07

0

First problem: the service provided by your bundle is of type ManagedServiceFactory. You are trying to inject a service of type MongoDBService. This obviously doesn't match.

Second problem: you should not be trying to directly consume ManagedServiceFactory yourself... it is part of the Config Admin specification, and should only be consumed by Config Admin itself.

Third problem: as Balazs points out, you are using annotations from a mixture of different frameworks: Declarative Services (DS) and Dependency Manager (DM). These cannot be mixed within a single component... pick one!

answered Jul 24 '16 at 20:07

Neil Bartlett

23,743
4
44
77

I'll change the annonation to @reference???But here it shows that we can use directly take a look.http://www.amdatu.org/components/mongodb.html – Abhishek Suthar Jul 25 '16 at 03:04
@AbhishekSuthar In the example the Component annotation comes from org.apache.felix.dm.annotation.api package. The first issue was that you mixed the two technologies (Declarative Services and Dependency Manager). – Balazs Zsoldos Jul 25 '16 at 17:15
Yes you should use @Reference but even if you do this you still need to address the other two problems. – Neil Bartlett Jul 25 '16 at 18:24
Ok but how to tackle second problem...how to get service from config admin? – Abhishek Suthar Jul 26 '16 at 03:36
You don't get services from config admin. You get the service of the type you're actually looking for, which is probably `MongoDBService`. Is there such a service? – Neil Bartlett Jul 26 '16 at 07:09
I think so because on this link they have provided the code how to use that service http://www.amdatu.org/components/mongodb.html and they are using like the way I have written. – Abhishek Suthar Jul 26 '16 at 18:01
There is no need to guess about this. Can you see a `MongoDBService` service listed in the console, or can't you? – Neil Bartlett Jul 26 '16 at 18:45

Get osgi service reference from pure osgi bundle in Liferay portlet

2 Answers2