Unable to deploy SlingServlet in CQ

Question

I'm trying to create a servlet in CQ to access some back-end services. Then from my page will make an AJAX call to get the response from servlet.

@Component(immediate = true, metatype = false, label = "feedServlet")
@Service(Servlet.class)
@Properties(value = {
    @org.apache.felix.scr.annotations.Property(name = "sling.servlet.methods", value = "POST"),
    @org.apache.felix.scr.annotations.Property(name = "sling.servlet.resourceTypes", value ="/bin/feedServlet/"),
    @org.apache.felix.scr.annotations.Property(name = "sling.servlet.selectors", value ="POST"),
    @org.apache.felix.scr.annotations.Property(name = "sling.servlet.extensions", value ="html")
})
/**
 * This servlet returns search results in json format.
 */
public class FeedServlet extends SlingAllMethodsServlet {

    private static final long serialVersionUID = -2139716879248038562L;

    /*
     * Inject the service in to the servlet.
     */
    // @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY, policy = ReferencePolicy.STATIC)
    // private SearchService searchService;

    // @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY, policy = ReferencePolicy.STATIC)
    // private FeedGeneratorService feedService;

    /*
     * @Reference private SlingRepository repository;
     */

    /**
     * Bind repository.
     * 
     * @param repository the repository
     */
    /*
     * public void bindRepository(SlingRepository repository) { this.repository = repository; }
     */

    /*
     * (non-Javadoc)
     * 
     * @see org.apache.sling.api.servlets.SlingAllMethodsServlet#doPost(org.apache.sling.api.SlingHttpServletRequest,
     * org.apache.sling.api.SlingHttpServletResponse)
     */
    @Override
    protected void doPost(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServerException,
            IOException {

        String feed = "test test test";

        response.getWriter().write(feed);
    }

And from my page,

$(document).ready(function(){
  $("#button1").click(function(){
      alert(0);
      var formData = 'tcc=123';
      $.ajax({
            url : '/bin/feedServlet/',
            type: 'POST',
           data : formData,
         success: function(data, textStatus, jqXHR)
         {
             alert("1 : "+data);
            // alert(eval(jqXHR));
            //data - response from server
        },
        error: function (jqXHR, textStatus, errorThrown)
        {
            alert(errorThrown);
        }
      });
  });

});

But, while making the request I'm getting an error:

18.04.2014 00:25:51.185 *ERROR* [0:0:0:0:0:0:0:1 [1397805951183] POST /bin/feedServlet/ HTTP/1.1] org.apache.sling.servlets.post.impl.operations.ModifyOperation Unable to create resource named feedServlet in /bin
18.04.2014 00:25:51.185 *ERROR* [0:0:0:0:0:0:0:1 [1397805951183] POST /bin/feedServlet/ HTTP/1.1] org.apache.sling.servlets.post.impl.operations.ModifyOperation Exception during response processing. javax.jcr.nodetype.ConstraintViolationException: No child node definition for feedServlet found in node /bin
    at org.apache.jackrabbit.core.NodeImpl.addNode(NodeImpl.java:1276)
    at org.apache.jackrabbit.core.session.AddNodeOperation.perform(AddNodeOperation.java:111)
    at org.apache.jackrabbit.core.session.AddNodeOperation.perform(AddNodeOperation.java:37)
    at org.apache.jackrabbit.core.session.SessionState.perform(SessionState.java:216)
    at org.apache.jackrabbit.core.ItemImpl.perform(ItemImpl.java:91)
    at org.apache.jackrabbit.core.NodeImpl.addNodeWithUuid(NodeImpl.java:1814)
    at org.apache.jackrabbit.core.NodeImpl.addNode(NodeImpl.java:1766)
    at org.apache.sling.jcr.resource.internal.helper.jcr.JcrResourceProvider.create(JcrResourceProvider.java:439)
    at org.apache.sling.resourceresolver.impl.ResourceResolverImpl.create(ResourceResolverImpl.java:1076)
    at org.apache.sling.servlets.post.impl.operations.AbstractCreateOperation.deepGetOrCreateNode(AbstractCreateOperation.java:530)
    at org.apache.sling.servlets.post.impl.operations.AbstractCreateOperation.processCreate(AbstractCreateOperation.java:104)
    at org.apache.sling.servlets.post.impl.operations.ModifyOperation.doRun(ModifyOperation.java:91)
    at org.apache.sling.servlets.post.AbstractPostOperation.run(AbstractPostOperation.java:92)
    at org.apache.sling.servlets.post.impl.SlingPostServlet.doPost(SlingPostServlet.java:202)
    at org.apache.sling.api.servlets.SlingAllMethodsServlet.mayService(SlingAllMethodsServlet.java:148)
    at org.apache.sling.api.servlets.SlingSafeMethodsServlet.service(SlingSafeMethodsServlet.java:344)
    at org.apache.sling.api.servlets.SlingSafeMethodsServlet.service(SlingSafeMethodsServlet.java:375)
    at org.apache.sling.engine.impl.request.RequestData.service(RequestData.java:508)
    at org.apache.sling.engine.impl.filter.SlingComponentFilterChain.render(SlingComponentFilterChain.java:45)
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:64)
    at com.day.cq.wcm.core.impl.WCMDebugFilter.doFilter(WCMDebugFilter.java:146)
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
    at com.day.cq.wcm.core.impl.WCMComponentFilter.filterRootInclude(WCMComponentFilter.java:356)
    at com.day.cq.wcm.core.impl.WCMComponentFilter.doFilter(WCMComponentFilter.java:168)
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
    at com.day.cq.personalization.impl.TargetComponentFilter.doFilter(TargetComponentFilter.java:96)
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
    at org.apache.sling.engine.impl.SlingRequestProcessorImpl.processComponent(SlingRequestProcessorImpl.java:254)
    at org.apache.sling.engine.impl.filter.RequestSlingFilterChain.render(RequestSlingFilterChain.java:49)
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:64)
    at com.day.cq.wcm.core.impl.AuthoringUIModeServiceImpl.doFilter(AuthoringUIModeServiceImpl.java:301)
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
    at com.day.cq.wcm.core.impl.warp.TimeWarpFilter.doFilter(TimeWarpFilter.java:106)
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
    at com.day.cq.wcm.mobile.core.impl.redirect.RedirectFilter.doFilter(RedirectFilter.java:290)
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
    at org.apache.sling.engine.impl.debug.RequestProgressTrackerLogFilter.doFilter(RequestProgressTrackerLogFilter.java:64)
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
    at com.day.cq.wcm.foundation.forms.impl.FormsHandlingServlet.doFilter(FormsHandlingServlet.java:221)
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
    at com.day.cq.theme.impl.ThemeResolverFilter.doFilter(ThemeResolverFilter.java:76)
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
    at com.adobe.granite.optout.impl.OptOutFilter.doFilter(OptOutFilter.java:74)
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
    at com.day.cq.wcm.core.impl.WCMRequestFilter.doFilter(WCMRequestFilter.java:90)
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
    at com.adobe.cq.history.impl.HistoryRequestFilter.doFilter(HistoryRequestFilter.java:107)
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
    at com.day.cq.wcm.designimporter.CanvasPageDeleteRequestFilter.doFilter(CanvasPageDeleteRequestFilter.java:88)
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
    at org.apache.sling.rewriter.impl.RewriterFilter.doFilter(RewriterFilter.java:83)
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
    at org.apache.sling.i18n.impl.I18NFilter.doFilter(I18NFilter.java:127)
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
    at org.apache.sling.bgservlets.impl.BackgroundServletStarterFilter.doFilter(BackgroundServletStarterFilter.java:135)
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:60)
    at org.apache.sling.engine.impl.SlingRequestProcessorImpl.processRequest(SlingRequestProcessorImpl.java:151)
    at org.apache.sling.engine.impl.SlingMainServlet.service(SlingMainServlet.java:206)
    at org.apache.felix.http.base.internal.handler.ServletHandler.doHandle(ServletHandler.java:96)
    at org.apache.felix.http.base.internal.handler.ServletHandler.handle(ServletHandler.java:79)
    at org.apache.felix.http.base.internal.dispatch.ServletPipeline.handle(ServletPipeline.java:42)
    at org.apache.felix.http.base.internal.dispatch.InvocationFilterChain.doFilter(InvocationFilterChain.java:49)
    at org.apache.felix.http.base.internal.dispatch.HttpFilterChain.doFilter(HttpFilterChain.java:33)
    at org.apache.sling.i18n.impl.I18NFilter.doFilter(I18NFilter.java:127)
    at org.apache.felix.http.base.internal.handler.FilterHandler.doHandle(FilterHandler.java:88)
    at org.apache.felix.http.base.internal.handler.FilterHandler.handle(FilterHandler.java:76)
    at org.apache.felix.http.base.internal.dispatch.InvocationFilterChain.doFilter(InvocationFilterChain.java:47)
    at org.apache.felix.http.base.internal.dispatch.HttpFilterChain.doFilter(HttpFilterChain.java:33)
    at org.apache.sling.security.impl.ReferrerFilter.doFilter(ReferrerFilter.java:263)
    at org.apache.felix.http.base.internal.handler.FilterHandler.doHandle(FilterHandler.java:88)
    at org.apache.felix.http.base.internal.handler.FilterHandler.handle(FilterHandler.java:76)
    at org.apache.felix.http.base.internal.dispatch.InvocationFilterChain.doFilter(InvocationFilterChain.java:47)
    at org.apache.felix.http.base.internal.dispatch.HttpFilterChain.doFilter(HttpFilterChain.java:33)
    at org.apache.felix.http.sslfilter.internal.SslFilter.doFilter(SslFilter.java:55)
    at org.apache.felix.http.base.internal.handler.FilterHandler.doHandle(FilterHandler.java:88)
    at org.apache.felix.http.base.internal.handler.FilterHandler.handle(FilterHandler.java:76)
    at org.apache.felix.http.base.internal.dispatch.InvocationFilterChain.doFilter(InvocationFilterChain.java:47)
    at org.apache.felix.http.base.internal.dispatch.HttpFilterChain.doFilter(HttpFilterChain.java:33)
    at com.adobe.granite.license.impl.LicenseCheckFilter.doFilter(LicenseCheckFilter.java:179)
    at org.apache.felix.http.base.internal.handler.FilterHandler.doHandle(FilterHandler.java:88)
    at org.apache.felix.http.base.internal.handler.FilterHandler.handle(FilterHandler.java:76)
    at org.apache.felix.http.base.internal.dispatch.InvocationFilterChain.doFilter(InvocationFilterChain.java:47)
    at org.apache.felix.http.base.internal.dispatch.HttpFilterChain.doFilter(HttpFilterChain.java:33)
    at org.apache.sling.engine.impl.log.RequestLoggerFilter.doFilter(RequestLoggerFilter.java:75)
    at org.apache.felix.http.base.internal.handler.FilterHandler.doHandle(FilterHandler.java:88)
    at org.apache.felix.http.base.internal.handler.FilterHandler.handle(FilterHandler.java:76)
    at org.apache.felix.http.base.internal.dispatch.InvocationFilterChain.doFilter(InvocationFilterChain.java:47)
    at org.apache.felix.http.base.internal.dispatch.HttpFilterChain.doFilter(HttpFilterChain.java:33)
    at org.apache.felix.http.base.internal.dispatch.FilterPipeline.dispatch(FilterPipeline.java:48)
    at org.apache.felix.http.base.internal.dispatch.Dispatcher.dispatch(Dispatcher.java:39)
    at org.apache.felix.http.base.internal.DispatcherServlet.service(DispatcherServlet.java:67)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
    at com.day.j2ee.servletengine.ServletRuntimeEnvironment.service(ServletRuntimeEnvironment.java:250)
    at com.day.j2ee.servletengine.RequestDispatcherImpl.doFilter(RequestDispatcherImpl.java:321)
    at com.day.j2ee.servletengine.RequestDispatcherImpl.service(RequestDispatcherImpl.java:340)
    at com.day.j2ee.servletengine.RequestDispatcherImpl.service(RequestDispatcherImpl.java:383)
    at com.day.j2ee.servletengine.ServletHandlerImpl.process(ServletHandlerImpl.java:335)
    at com.day.j2ee.servletengine.HttpListener$Worker.run(HttpListener.java:644)
    at java.lang.Thread.run(Unknown Source)
Caused by: javax.jcr.nodetype.ConstraintViolationException: no matching child node definition found for {}feedServlet
    at org.apache.jackrabbit.core.nodetype.EffectiveNodeType.getApplicableChildNodeDef(EffectiveNodeType.java:744)
    at org.apache.jackrabbit.core.NodeImpl.getApplicableChildNodeDefinition(NodeImpl.java:817)
    at org.apache.



jackrabbit.core.NodeImpl.addNode(NodeImpl.java:1274)
    ... 98 more

Answer 1

You have got your properties wrong. Kindly refer to the sling docs to know what each property that you have set does.

The property sling.servlet.paths should be used instead of sling.servlet.resourceTypes to provide the path under which the servlet is accessible as a Resource.

Thus for your requirement, the following annotations would suffice.

sling.servlet.methods - For the request methods supported by the servlet.

sling.servlet.paths - For the request path that is handled by this servlet.

@Component(immediate = true, metatype = false, label = "feedServlet")
@Service(Servlet.class)
@Properties(value = {
    @org.apache.felix.scr.annotations.Property(name = "sling.servlet.methods", value = "POST"),
    @org.apache.felix.scr.annotations.Property(name = "sling.servlet.paths", value ="/bin/feedServlet"))
})
public class FeedServlet extends SlingAllMethodsServlet {

    private static final long serialVersionUID = -2139716879248038562L;

    @Override
    protected void doPost(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServerException,
            IOException {

        String feed = "test test test";

        response.getWriter().write(feed);
    }
}