AEM6.4 @Reference not working in SlingServlet

Forum|Forum|6 years ago
April 1, 2019
23 replies
24983 views

Hi All,

My sling servlet is not working as soon as i add

@Reference in it, otherwise it works fine

Below is the servlet code, i have create custom configuration as per the AEM6.4 standards(one @Interface class, one Interface class, one Impl class with proper annotations(org.osgi.service.component.annotations))

@Component(service = Servlet.class,

property = { Constants.SERVICE_DESCRIPTION + "=Simple Demo Servlet",

"sling.servlet.methods=" + HttpConstants.METHOD_GET,

"sling.servlet.paths=" + "/bin/testservlet" }

)

public class TestServlet extends SlingAllMethodsServlet {

private static final long serialVersionUID = 1L;

@Reference

MySimpleService mySimpleService;

private static final Logger logger =

LoggerFactory.getLogger(TestServlet.class);

@Override

protected void doGet(final SlingHttpServletRequest req, final

SlingHttpServletResponse resp) throws ServletException, IOException {

logger.info("Inside doGet!!!");

try {

logger.info("Name ::: "+mySimpleService.getMyName());

resp.getWriter().write(mySimpleService.getMyName()); }

catch(Exception ex) {

logger.error("Error in doGet ::: ", ex);

}

Please advise, any help is highly appreciated.

Thanks,

Pradeep

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Best answer by smacdonald2008

Look at our SOLR Article. This one closely matches your requirement. We have a class named MySimpleService that reads OSGi config values.

In the Servlet in this article - we use a @Refence to get config values:

@Reference

SolrServerConfiguration solrConfigurationService;

This shows the proper way of getting OSGI configuration information within an AEM Servlet. Never try and read OSGI config information directly from a servlet. Write a separate class - as shown in this development article.

Adobe Experience Manager Help | Integrating SOLR with Adobe Experience Manager 6.4

Hope this clear this issue up. Notice the Java code in this Servlet. We use the CONFIG values to perform SOLR actions - such as getting the URL to the SOLR server.

final String protocol = solrConfigurationService.getSolrProtocol();

final String serverName = solrConfigurationService.getSolrServerName();

final String serverPort = solrConfigurationService.getSolrServerPort();

final String coreName = solrConfigurationService.getSolrCoreName();

final String pagesResourcePath = solrConfigurationService

I would go through this entire article so you understand.

Hope this helps you.