MessageGateway is

[HanL]

Hi 
I am created an email servlet in AEM and it works fine when I tested it on my local 4502,

but when I test this servlet on company DEV environment, the messageGateway is always null

	    	MessageGateway<HtmlEmail> messageGateway = messageGatewayService.getGateway(HtmlEmail.class);

 Here's my code:

@component(service = Servlet.class,
property = {
"sling.servlet.methods=" + "GET",
"sling.servlet.paths =" + "/bin/test/email-content-report"})
public class ContentReportServlet extends SlingAllMethodsServlet {

    @reference
    MessageGatewayService messageGatewayService;
    @Override
    protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) {
    	try {
    		
			
	    	MessageGateway<HtmlEmail> messageGateway = messageGatewayService.getGateway(HtmlEmail.class);
	    	
	    	if(messageGateway != null) {
	    		HtmlEmail email = new HtmlEmail();
	    		email.setCharset("utf-8");
	    		
		    	email.addTo(recipientemail);
	    		email.setFrom("noreply@test.ca");
	    		email.setSubject("Email Testing");
	    		email.setHostName("mailgateway.uk.fid-intl.com");
	    		email.setSmtpPort(587);
	    		email.setSSLOnConnect(false);

	    		email.setHtmlMsg("Test message");
	    		
	    		ByteArrayDataSource dataSource = new ByteArrayDataSource(byteStream.toByteArray(), "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
	    		email.attach(dataSource, "filename.xlsx", "ContentReport", HtmlEmail.ATTACHMENTS);

	    		messageGateway.send(email);
	    		
	    	}
		} catch (Exception e) {
	        log.error("Error occurred while sending report by email: {}", e.getMessage(), e);
        }  

}
}

I found a few old posts with the same issue saying that I need to change the day cq mail service, I tried that but still doesn't work
here's the day cq mail service on my local

Here's the day cq mail service for the dev environment

Please advise. 
Thank you

[SureshDhulipudi]

Is the MessageGatewayService is active?

can you check that in configMgr.

Also make sure the annotations are used properly 

@reference

@component

keep some log statements to get more details and also can we get Service class code also?

[HanL]

Hi Suresh
For those two annotations, I am using:
import org.osgi.service.component.annotations.Component;
import org.apache.felix.scr.annotations.Reference;
In the log, an exception was thrown 

java.lang.NullPointerException: null

at

	    	MessageGateway<HtmlEmail> messageGateway = messageGatewayService.getGateway(HtmlEmail.class);

I tried to search MessageGatewayService in configMgr in both my local and DEV environments, can't find anything.

May I ask, what Service class do you mean?

Thank you

[SureshDhulipudi · Accepted solution]

use same OSGI annotation for Reference also.

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

That is the issue. instead of using from Felix.

[HanL]

That worked, thanks for the help!