"Form failure"

[j...@mussenbrock-w.de]

When doing the tutorial (https://docs.camunda.org/get-started/bpmn20/forms/) I encounter the error "Form failure: Origin is not allowed by Access-Control-Allow-Origin" instead of seeing the Forms.
Can you give me hint what could be wrong?

[Roman Smirnov]

Hi Jan,

Have you already tried to clear the browser cache?

Cheers,

Roman

[webcyberrob]

Hi Roman,

I'm suddenly getting the same behaviour on a prior working process. Ive cleared the cache, but to no avail. My suspcion is its possibly a Chrome update. I shall see if I ca configure a CORS filter work around.

regards

Rob

[webcyberrob]

Heres a work around - the problem seems to be when Tasklist tries to integrate an embedded form, it is running into a CORS security constraint.

If you are using Tomcat in a shared engine architecture:

create a minimalist web.xml file in your projects WEB-INF.

Add the following CORS filter config such that your web.xml may look like...

<?xml version="1.0" encoding="ISO-8859-1"?>

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"

     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"

     version="2.5">

<filter>

  <filter-name>CorsFilter</filter-name>

  <filter-class>org.apache.catalina.filters.CorsFilter</filter-class>

</filter>

<filter-mapping>

  <filter-name>CorsFilter</filter-name>

  <url-pattern>/*</url-pattern>

</filter-mapping>

</web-app>

hence re-deploy your war file and the form should be accessible.

regards

Rob

[j...@mussenbrock-w.de]

I'm using Wildfly. Is there a solution for Wildfly too?

[Roman Smirnov]

Hi Jan,

Which context path is returned? Therefore please login into tasklist and execute the following request in the browser:

GET http://<host>:<port>/camunda/api/engine/engine/default/task/<task-id>/form

or in case of a start form

GET http://<host>:<port>/camunda/api/engine/engine/default/process-definition/<proces-definition-id>/startForm

Could you please provide us with the complete error message?

Have you already tried to open your browser in incognito mode?

Cheers,

Roman

[Paulo Emerique]

Hi, I´m having same error, everything was working but now forms are not rendering ... on firefox I get only spinning arrows, on chrome I get "Form failure: Origin is not allowed by Access-Control-Allow-Origin"

Reply from http://<host>:<port>/camunda/api/engine/engine/default/task/<task-id>/form is:

{"key":"embedded:app:workflow/remessa_recebida","contextPath":null}

[Paulo Emerique]

Solved after removing all deployments (cascading) ... and redeploying