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
Solved! Go to Solution.
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.
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Hi @SanketJa1
Please check the imports
import org.osgi.service.component.annotations.Reference;
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I finally solved this, though it was very weird, first we have to save the configuration then servlet will become in 'satisfied' state.
Once servlet is in satisfied state we can call the same in url.
Thanks everyone for helping me on this.
Regards,
Pradeep
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The reason is your not setting default value of configuration and service returning null.
You can use the configuration like I mentioned to set default value of property and servlet will work without saving osgi value.
example code I posted in last comment.
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I had set default value(i have shared all my code in post), still i have to open the configuration and save once to bring servlet in satisfied state.
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Hi,
you were using below which was returning null
@AttributeDefinition(name = "Test Namel", defaultValue="Pradeep", description = "Read my name")
String name();
But I changed your config class like below, I was getting results
@AttributeDefinition(
name = "Test Name",
description = "Read my Name",
type = AttributeType.STRING
)
String getName() default "Pradeep";
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