[Java][webclient] NullPointerException on generated code - getAuthentication

Created by: marcoreni

Description

I have a spec that includes authentication. I successfully generated sources using java/webclient, but as I try to use the generated code and set the authentication as explained in the generated README I get NullPointerException.

ApiClient defaultClient = Configuration.getDefaultApiClient();
        
// Configure API key authorization: secret
ApiKeyAuth apiKey = (ApiKeyAuth) defaultClient.getAuthentication("secret");
apiKey.setApiKey("YOUR API KEY");

[...]
Caused by: java.lang.NullPointerException: null
	at com.example.ApiClient.getAuthentication(ApiClient.java:168)
[...]

LineRef:
167 public Authentication getAuthentication(String authName) {
168        return authentications.get(authName);
169    }

openapi-generator version

3.2.2

OpenAPI declaration file content or url

openapi: 3.0.0

security:
  - secret: []

# Application Components
components:
  securitySchemes:
    secret:
      type: apiKey
      in: query
      name: secret

Suggest a fix/enhancement

Checking the code at https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/resources/Java/libraries/webclient/ApiClient.mustache#L108 it seems that init() method is never called while creating the client, so authentications is null.