where ware the "new" annotations for servlets? | Community
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TB3dock
New Participant
April 18, 2021
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where ware the "new" annotations for servlets?

  • April 18, 2021
  • 1 reply
  • 655 views

This page: https://sling.apache.org/documentation/the-sling-engine/servlets.html has an embeded presentation which has servlet declarations like this:

 

@SlingServiceResourceTypes(resourceTypes="xx/yy/zz") etc.

 

However, all the examples and AEM docs seem to only support this older format:

 

@8220494(service = Servlet.class, property = { Constants.SERVICE_DESCRIPTION + "=something",

"sling.servlet.methods=" + HttpConstants.METHOD_GET, "sling.servlet.paths=" + "/bin/api/mypath" })

 

Is this new format available in the latest cloud SDK, and are there any examples of it does anyone know?

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Best answer by Asutosh_Jena_

Hi @tb3dock 

 

OSGi DS 1.4 (R7) component property type annotations for Sling Servlets (recommended) is supported from bnd-maven-plugin 4.1.0+ and maven-bundle-plugin 4.1.0+ and this is the recommended approach to write the Servlet. I personally am using this on my AEM 6.5.5.0 instance and it's not specific to AEM as Cloud SDK.

 

@Component(service = {Servlet.class})
@SlingServletResourceTypes(
        resourceTypes = "/apps/my/type",
        methods = "GET",
        extensions = "html",
        selectors = "hello")
public class MyServlet extends SlingSafeMethodsServlet {

    @Override
    protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException {
        ...
    }
}

 

Simple OSGi DS 1.2 annotations were used earlier and also can be used now only if we cannot use the above approach which I believe will never be a case 🙂

All the articles that are written so far are before DS 1.4 was released and it's never updated. But we should always refer the Sling document for updates.

 

@Component(service = {Servlet.class},
        property = {
                ServletResolverConstants.SLING_SERVLET_RESOURCE_TYPES + "=/apps/my/type"
                ServletResolverConstants.SLING_SERVLET_METHODS + "=GET",
                ServletResolverConstants.SLING_SERVLET_EXTENSIONS + "=html",
                ServletResolverConstants.SLING_SERVLET_SELECTORS + "=hello",
        }
)
public class MyServlet extends SlingSafeMethodsServlet {

    @Override
    protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException {
        ...
    }
}

 

I will suggest that you should go with DS 1.4 version.

 

Hope this helps!

Thanks

1 reply

Asutosh_Jena_
Asutosh_Jena_Accepted solution
New Participant
April 18, 2021

Hi @tb3dock 

 

OSGi DS 1.4 (R7) component property type annotations for Sling Servlets (recommended) is supported from bnd-maven-plugin 4.1.0+ and maven-bundle-plugin 4.1.0+ and this is the recommended approach to write the Servlet. I personally am using this on my AEM 6.5.5.0 instance and it's not specific to AEM as Cloud SDK.

 

@Component(service = {Servlet.class})
@SlingServletResourceTypes(
        resourceTypes = "/apps/my/type",
        methods = "GET",
        extensions = "html",
        selectors = "hello")
public class MyServlet extends SlingSafeMethodsServlet {

    @Override
    protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException {
        ...
    }
}

 

Simple OSGi DS 1.2 annotations were used earlier and also can be used now only if we cannot use the above approach which I believe will never be a case 🙂

All the articles that are written so far are before DS 1.4 was released and it's never updated. But we should always refer the Sling document for updates.

 

@Component(service = {Servlet.class},
        property = {
                ServletResolverConstants.SLING_SERVLET_RESOURCE_TYPES + "=/apps/my/type"
                ServletResolverConstants.SLING_SERVLET_METHODS + "=GET",
                ServletResolverConstants.SLING_SERVLET_EXTENSIONS + "=html",
                ServletResolverConstants.SLING_SERVLET_SELECTORS + "=hello",
        }
)
public class MyServlet extends SlingSafeMethodsServlet {

    @Override
    protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException {
        ...
    }
}

 

I will suggest that you should go with DS 1.4 version.

 

Hope this helps!

Thanks

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