I am trying to call an Apex method imperatively with complex parameters from a Lightning Web Component but I'm getting an http 500 response every time. Here is what I'm doing which is a copy of this recipe.

So I have a TestController with an action exposed and a couple of inner classes which are my request/response objects:

 public with sharing class TestController {
    public TestController() {


    public static TestResponse testAction(TestRequest req){
        return new TestResponse(req);

    public class TestResponse {
        @AuraEnabled public String testId {get; set;}

        public TestResponse(TestRequest req){
            this.testId = req.testId;

    public class TestRequest { 
        @AuraEnabled public String testId {get; set;}

The javascript code for the lwc is:

import { LightningElement, track } from "lwc";
import testAction from "@salesforce/apex/TestController.testAction";

export default class Test extends LightningElement {
    @track res;

        const request = { testId: "foo" };
        testAction({ req: request })
              .then(response => {
              .catch(error => {

And this is the response I always get from the server:

   statusText: "Server Error",
   ok: false,
   status: 500,
   body: {
   message: "An internal server error has occurred↵Error ID: 214808163- 
 50404 (1739684013)"
   headers: {}

It seems to be a problem when salesforce it's trying to bind what it's being sent from the client to the parameter object because it doesn't even reach the controller action.

UPDATE I am working on a scratch org, and have the component in a lightning community

  • Do your apex debug logs give you any error message? – Kasper Feb 21 '20 at 10:51
  • nothing @Kasper – Daniel Feb 21 '20 at 10:51

The problem looks like the combination of both Apex inner classes and a namespace.

  • With neither, a class name is e.g. MyOuter
  • With an inner class, a class name is e.g. MyOuter.MyInner
  • With a namespace, a class name is e.g. myNs.MyOuter
  • With both, a class name is e.g. myNs.MyOuter.MyInner

The both case - two dots - appears to be broken. So the workaround is to not use inner classes.

(Daniel is a colleague of mine.)


I tried your code, and all work fine. It's very strange for me. Looks like problem with server connection. Try to deploy again your code.

  • I'm deploying to a scratch org through sfdx force:source:push. Could it be something with the org definition? – Daniel Feb 21 '20 at 11:57
  • I have done it on scratch org - it is all right too. – Alexandr Feb 21 '20 at 13:30
  • @Daniel Perhaps having a namespace set in the scratch org is the problem? – Keith C Feb 24 '20 at 8:40
  • Alexandr, Did you test in a Community or a normal UI page? – Keith C Feb 24 '20 at 9:57

I agree with @Alexandr. I have seen this issue come up when there is an issue with my Apex Controller that my LWC references. Try re-deploying your Apex Controller and LWC to confirm everything can push successfully. In my case, the params changed on another Apex Class that my Apex Controller was calling, and I didn't realize it until my Apex Controller failed to deploy. My error message was slightly different:

Error: apex://Apex_Controller_Name: No apex action available for Apex_Controller_Name.methodName↵

Internal Error: 500

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