Level 2

How to call a servlet from react component

Forum|Forum|3 years ago
March 8, 2022
3 replies
8108 views

Hi,

do you have any tutorial on how to create servlet and call it from react?

I did this, I create one servlet like that

and I call it in react like that

and I got this error in console

How can I solve it?

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Siva_Sogalapalli

Community Advisor

I hope you're trying to call the servlet from AEM itself, did you try by removing localhost:4502 and just use something like post('/bin/login', fromData) and see how it works.

foalowainiAuthor

Level 2

@siva_sogalapalli

nothing change

same issue

I call it from http://localhost:4502/content/myproject/us/en/login.html

Anmol_Bhardwaj

Community Advisor

Can you try this and see if it works:

http://localhost:4502/system/console/components
Go to "Apache Sling Referrer Filter"
Select "Allow Empty"

If your requests are getting blocked, this should fix it.

- Please check if you have implemented SlingHttpSafeServlet or AllMethodServlet in your servlet.

- Try to call the same servlet through Postman and see if it is working fine

foalowainiAuthor

Level 2

@anmol_bhardwaj

I tried that, does not works

I have this as filter

Vijayalakshmi_S

Level 10

yes I tried on Postman and I got same

Here is the response from Postman

################################################################

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">

<html>

<head>

<title>405 Method POST not supported</title>

</head>

<body>

<h1>Method POST not supported</h1>

<p>Cannot serve request to /bin/login in com.day.cq.auth.impl.LoginServlet</p>

<h3>Request Progress:</h3>

<pre>

0 TIMER_START{Request Processing}

1 COMMENT timer_end format is {<elapsed microseconds>,<timer name>} <optional message>

44 LOG Method=POST, PathInfo=null

45 TIMER_START{handleSecurity}

1813 TIMER_END{1765,handleSecurity} authenticator org.apache.sling.auth.core.impl.SlingAuthenticator@296f089d returns true

2156 TIMER_START{ResourceResolution}

2230 TIMER_END{73,ResourceResolution} URI=/bin/login resolves to Resource=ServletResource, servlet=com.day.cq.auth.impl.LoginServlet, path=/bin/login

2282 LOG Resource Path Info: SlingRequestPathInfo: path='/bin/login', selectorString='null', extension='null', suffix='null'

2282 TIMER_START{ServletResolution}

2284 TIMER_START{resolveServlet(/bin/login)}

2292 TIMER_END{7,resolveServlet(/bin/login)} Using servlet com.day.cq.auth.impl.LoginServlet

2294 TIMER_END{11,ServletResolution} URI=/bin/login handled by Servlet=com.day.cq.auth.impl.LoginServlet

2297 LOG Applying Requestfilters

2299 LOG Calling filter: com.adobe.granite.resourceresolverhelper.impl.ResourceResolverHelperImpl

2304 LOG Calling filter: org.apache.sling.security.impl.ContentDispositionFilter

2307 LOG Calling filter: org.apache.sling.i18n.impl.I18NFilter

2310 LOG Calling filter: com.adobe.granite.httpcache.impl.InnerCacheFilter

2314 LOG Calling filter: org.apache.sling.rewriter.impl.RewriterFilter

2316 LOG Calling filter: com.adobe.cq.mcm.campaign.servlets.CampaignCopyTracker

2318 LOG Calling filter: com.adobe.cq.history.impl.HistoryRequestFilter

2467 LOG Calling filter: com.day.cq.wcm.core.impl.WCMRequestFilter

2477 LOG Calling filter: com.adobe.cq.wcm.core.components.internal.servlets.CoreFormHandlingServlet

2480 LOG Calling filter: com.adobe.granite.optout.impl.OptOutFilter

2484 LOG Calling filter: com.day.cq.wcm.foundation.forms.impl.FormsHandlingServlet

2485 LOG Calling filter: com.adobe.cq.social.commons.cors.CORSAuthenticationFilter

2487 LOG Calling filter: org.apache.sling.engine.impl.debug.RequestProgressTrackerLogFilter

2489 LOG Calling filter: com.aem.core.filters.LoggingFilter

2492 LOG Calling filter: com.aem.geeks.core.filters.LoggingFilter

2495 LOG Calling filter: com.day.cq.wcm.mobile.core.impl.redirect.RedirectFilter

2498 LOG Calling filter: com.day.cq.wcm.core.impl.AuthoringUIModeServiceImpl

2581 LOG Calling filter: com.adobe.granite.csrf.impl.CSRFFilter

2584 LOG Calling filter: com.adobe.granite.rest.assets.impl.AssetContentDispositionFilter

2586 LOG Calling filter: com.adobe.granite.requests.logging.impl.RequestLoggerImpl

2590 LOG Calling filter: com.adobe.granite.rest.impl.servlet.ApiResourceFilter

2613 LOG Calling filter: com.day.cq.dam.core.impl.assetlinkshare.AdhocAssetShareAuthHandler

2615 LOG Calling filter: com.day.cq.dam.core.impl.servlet.ActivityRecordHandler

2627 LOG Calling filter: com.adobe.cq.social.ugcbase.security.impl.SaferSlingPostServlet

2631 LOG Calling filter: com.day.cq.wcm.core.impl.warp.TimeWarpFilter

2637 LOG Applying Componentfilters

2638 LOG Calling filter: com.day.cq.personalization.impl.TargetComponentFilter

2640 LOG Calling filter: com.day.cq.wcm.core.impl.page.PageLockFilter

2643 LOG Calling filter: com.day.cq.wcm.core.impl.WCMComponentFilter

2777 LOG Calling filter: com.day.cq.wcm.core.impl.WCMDebugFilter

2784 TIMER_START{com.day.cq.auth.impl.LoginServlet#0}

2816 LOG Applying Error filters

2817 LOG Calling filter: org.apache.sling.i18n.impl.I18NFilter

2819 LOG Calling filter: org.apache.sling.rewriter.impl.RewriterFilter

2824 TIMER_START{handleError:status=405}

3677 TIMER_END{849,handleError:status=405} Using handler /libs/sling/servlet/errorhandler/default.jsp

5203 LOG Found processor for post processing ProcessorConfiguration: {contentTypes=[text/html], order=-1, active=true, valid=true, processErrorResponse=true, pipeline=(generator=Config(type=htmlparser, config={}), transformers=(Config(type=linkchecker, config={}), Config(type=mobile, config=JcrPropertyMap [node=Node[NodeDelegate{tree=/libs/cq/config/rewriter/default/transformer-mobile: { jcr:primaryType = nt:unstructured, component-optional = true}}], values={jcr:primaryType=nt:unstructured, component-optional=true}]), Config(type=mobiledebug, config=JcrPropertyMap [node=Node[NodeDelegate{tree=/libs/cq/config/rewriter/default/transformer-mobiledebug: { jcr:primaryType = nt:unstructured, component-optional = true}}], values={jcr:primaryType=nt:unstructured, component-optional=true}]), Config(type=contentsync, config=JcrPropertyMap [node=Node[NodeDelegate{tree=/libs/cq/config/rewriter/default/transformer-contentsync: { jcr:primaryType = nt:unstructured, component-optional = true}}], values={jcr:primaryType=nt:unstructured, component-optional=true}]), serializer=Config(type=htmlwriter, config={}))}

5515 TIMER_END{5513,Request Processing} Dumping SlingRequestProgressTracker Entries

</pre>

<hr>

<address>ApacheSling/2.6 (jetty/9.4.15.v20190215, Java HotSpot(TM) 64-Bit Server VM 1.8.0_321, Windows 10 10.0

amd64)</address>

</body>

</html>

#########################################################

Here is servlet code:

###########################################################

##########################################################

package com.myproject.aem.core.servlets;

import javax.jcr.Node;

import javax.jcr.RepositoryException;

import javax.servlet.Servlet;

import javax.servlet.http.HttpServletResponse;

import org.apache.sling.api.SlingHttpServletRequest;

import org.apache.sling.api.SlingHttpServletResponse;

import org.apache.sling.api.resource.PersistenceException;

import org.apache.sling.api.resource.Resource;

import org.apache.sling.api.resource.ResourceResolver;

import org.apache.sling.api.servlets.HttpConstants;

import org.apache.sling.api.servlets.SlingAllMethodsServlet;

import org.osgi.framework.Constants;

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

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import javax.servlet.ServletException;

import java.io.IOException;

@Component(

service = Servlet.class,

property = {

Constants.SERVICE_DESCRIPTION + "=Simple Demo Servlet",

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

"sling.servlet.paths=" + "/bin/login" })

public class LoginServlet extends SlingAllMethodsServlet {

/**

* Generated serialVersionUID

private static final long serialVersionUID = -159625176093879129L;

/**

* Logger

private static final Logger log = LoggerFactory.getLogger(LoginServlet.class);

// @9944223

// protected void doGet(final SlingHttpServletRequest req,

// final SlingHttpServletResponse resp) {

// // final Resource resource = req.getResource();

// resp.setStatus(HttpServletResponse.SC_OK);

// // resp.setContentType("text/plain");

// // resp.getWriter().write("Title = " + resource.getValueMap().get(JcrConstants.JCR_TITLE));

// }

/**

* Overridden doPost() method which is invoked when an HTTP post request is made

@Override

protected void doPost(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException {

/**

* Getting the instance of resource resolver from the request

ResourceResolver resourceResolver = request.getResourceResolver();

/**

* Getting the resource object via path

Resource resource = resourceResolver.getResource("/content/myproject/en");

log.info("Resource is at path {}", resource.getPath());

if(request.getAttribute("username").equals("DEV_PRAVEENK"))

response.setStatus(HttpServletResponse.SC_OK);

else

response.setStatus(HttpServletResponse.SC_FORBIDDEN);

}

######################################################

@foalowaini

The request to /bin/login is served using OOTB servlet and not your custom servlet.

2294 TIMER_END{11,ServletResolution} URI=/bin/login handled by Servlet=com.day.cq.auth.impl.LoginServlet

com.day.cq.auth.impl.LoginServlet - OOTB servlet registered with path - /bin/login and it overrides GET method alone and hence the error, POST is not allowed (405)

Suggest to change the path specific to your project (say, /bin/exampleproject/login) or register the servlet with resourceType.