II have a servlet (example" localhost:4502/bin/my-servlet-here) where I would need to access an OSGI service.
I've tried several stuff I saw online but I cannot get access/reference to the OSGI service from my servlet.
Any ideas on how it can be done?
In the code servlet class below, I was debugging in my IDE (IntelliJ) and it's hanging/not responding on the line that starts with "ServiceReference reference"
Thanks
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my servlet class
package com.myhost.core.servlets;
import com.myhost.core.services.MyService;
import javax.annotation.Resource;
import javax.inject.Inject;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import org.apache.felix.scr.annotations.sling.SlingServlet;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.servlets.SlingAllMethodsServlet;
import org.apache.sling.commons.json.JSONException;
import org.apache.sling.commons.json.JSONObject;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
@SlingServlet(paths = "/bin/myservlet", methods = "GET", metatype = true)
public class MyServlet extends SlingAllMethodsServlet {
@Resource(name="BundleContext")
private BundleContext context;
@Override
protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException {
ServiceReference reference = context.getServiceReference(MyService.class.getName());
MyService service = (MyService)context.getService(reference);
response.setCharacterEncoding("UTF-8");
response.setContentType("application/json;charset=UTF-8");
// the code the populates the JSON variable has been taken out
printWriter.write(jsonObject.toString());
}
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my service class
package com.myhost.core.services;
public interface MyService {
String getPassword(String type);
}
---------
my service class implementation
package com.myhost.core.services.impl;
import com.myhost.core.services.MyService;
import org.apache.felix.scr.annotations.Activate;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Property;
import org.apache.felix.scr.annotations.Service;
import org.apache.sling.commons.osgi.PropertiesUtil;
import java.util.Map;@Service
@Component(metatype = true, label = "My Service Implementation")
public class MyServiceImpl implements MyService {
@Property(label = "property1")private static final String Property1 = "com.myhost.core.services.MyService.property1";
private String property1;
@Property(label = "property2")
private static final String Property2 = "com.myhost.core.services.MyService.property2";
private String property2;
@Activate
protected void activate(Map<String, Object> properties) {
this.property1 = PropertiesUtil.toString(properties.get(Property1), null);
this.property2 = PropertiesUtil.toString(properties.get(Property2), null);
}
@Override
public String getProperty(int temp) {
switch (temp) {
case 1:
return property1;
case 2:
return property2;
default:
return "";
}
}
}
It seems that you want to use R4 for this implementation..
Did you try using @Reference annotation in servlet?
@Reference
private MyService myService;
Add immediate=true in service
you may not need the following lines unless you have a specific requirement:
I did try @reference also (didn't write that in the original post) and service variable was null. But I also didn't have immediate=true. Trying your suggestion now.
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If you don't want to use this service outside bundle then remove @Service annotation from MyServiceImpl and use @Reference annotation as suggested by Gaurav.
@Reference
private MyService myService;
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