liferay error not showing portlet

Question

1. Created workspace
2. Created service builder and added entity
3. Created DemoPortlet
4. I'am trying to get data from DB and system.out in doView method in DemoPortlet.
5. When i use CountryLocalServiceUtil (CountryLocalServiceUtil.getCountriesCount()) - ERROR [http-bio-8080-exec-10][render_portlet_jsp:132] null

I read that I can use CountryLocalService, @Reference etc.? Is this code ok? I can see that my portlet is Active, but it is not showing in Sample widget. Can you provide code, hot to call getCountriesCount() using CountryLocalService?

  @Component(
        immediate = true,
        property = {
            "com.liferay.portlet.display-category=category.sample",
            "com.liferay.portlet.instanceable=true",
            "javax.portlet.init-param.template-path=/",
            "javax.portlet.init-param.view-template=/view.jsp",
            "javax.portlet.name=" + DemoPortletKeys.Demo,
            "javax.portlet.resource-bundle=content.Language",
            "javax.portlet.security-role-ref=power-user,user"
        },
        service = Portlet.class
    )
    public class DemoPortlet extends MVCPortlet {

        private CountryLocalService countryLocalService;


        @Override
        public void doView(RenderRequest renderRequest, RenderResponse renderResponse)
                throws IOException, PortletException {
            // TODO Auto-generated method stub

            System.out.println("********" + getCountryLocalService().getCountriesCount() + " ********************");

            super.doView(renderRequest, renderResponse);
        }

        public CountryLocalService getCountryLocalService() {
            return countryLocalService;
            }

        @Reference(unbind = "-")
        public void setCountryLocalService(CountryLocalService countryLocalService) {
        this.countryLocalService = countryLocalService;
        }
    }

Answer 1

You don't specify which exact version of Liferay you're using, it's just obvious that it's either 7.0 or 7.1. In the current codebase I don't see any CountryLocalService, but there's a com.liferay.portal.kernel.service.CountryService.

The following code, that is almost identical to your code, works for me on Liferay DXP 7.0, the portlet deploys, appears in the sample category, and was created by just starting from the mvc-portlet template in Liferay Developer Studio. The only file I've edited is the one shown here.

package com.example.country.portlet.portlet;

import com.example.country.portlet.constants.CountryPortletKeys;
import com.liferay.portal.kernel.portlet.bridges.mvc.MVCPortlet;
import com.liferay.portal.kernel.service.CountryService;

import java.io.IOException;

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

import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;

@Component(
    immediate = true,
    property = {
        "com.liferay.portlet.display-category=category.sample",
        "com.liferay.portlet.instanceable=true",
        "javax.portlet.display-name=countryportlet Portlet",
        "javax.portlet.init-param.template-path=/",
        "javax.portlet.init-param.view-template=/view.jsp",
        "javax.portlet.name=" + CountryPortletKeys.Country,
        "javax.portlet.resource-bundle=content.Language",
        "javax.portlet.security-role-ref=power-user,user"
    },
    service = Portlet.class
)
public class CountryPortlet extends MVCPortlet {
    private CountryService countryService;

    @Override
    public void doView(RenderRequest renderRequest, RenderResponse renderResponse)
            throws IOException, PortletException {
        System.out.println("************* " + countryService.getCountries().size() + " ***************");
        super.doView(renderRequest, renderResponse);
    }

    @Reference
    public void setCountryService(CountryService cs) {
        this.countryService = cs;
    }
}