Adobe@Adobe

There are many ways to define an OSGI service.
This is the preferred coding style for CQ version 5.5-5.6 that we follow on our team.

Registering the servlet by path

import org.apache.felix.scr.annotations.Properties;
import org.apache.felix.scr.annotations.Property;
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 javax.servlet.ServletException;
import java.io.IOException;

@SlingServlet(
    paths={"/services/unicom/v1/"}
)
@Properties({
    @Property(name="service.pid", value="com.adobe.unicom.v1.servlets.OmnnitureLoggingServlet",propertyPrivate=false),
    @Property(name="service.description",value="Omniture service call logging servlet", propertyPrivate=false),
    @Property(name="service.vendor",value="Adobe Systems Incorporated - Adobe@Adobe Team", propertyPrivate=false)
})
public class OmnnitureLoggingServlet extends SlingAllMethodsServlet
{
    @Override
    protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException
    {
        //Do something fun here
    }

    @Override
    protected void doPost(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException
    {
        //Do something fun here
    }
}

OR  registering the servlet by resource type and extension
import org.apache.felix.scr.annotations.Properties;
import org.apache.felix.scr.annotations.Property;
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 javax.servlet.ServletException;
import java.io.IOException;

@SlingServlet(
    resourceTypes = {".api"},
    methods = {"GET", "POST"}
)
@Properties({
    @Property(name="service.pid", value="com.adobe.unicom.v1.servlets.OmnnitureLoggingServlet",propertyPrivate=false),
    @Property(name="service.description",value="Omniture service call logging servlet", propertyPrivate=false),
    @Property(name="service.vendor",value="Adobe Systems Incorporated - Adobe@Adobe Team", propertyPrivate=false)
})
public class OmnnitureLoggingServlet extends SlingAllMethodsServlet
{
    @Override
    protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException
    {
        //Do something fun here
    }

    @Override
    protected void doPost(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException
    {
        //Do something fun here
    }
}

For more details on the Felix Annotations see