Dispair of error "Failed to load the bootstrap javascript: ./VAADIN/vaadinB

General
1

Hi,
On my local system my application runs fine. But deploying this application to my webhosters Tomcat it doesn’t run there. I tried everthing found in dozens of posts but nothing solved this problem.

I use Vaadin 7.3.6, Tomcat 7, Servlet API 3.0.

my guess is, that someting in my web.xml is wrong. I have attached it to this post.

Thank you for help,
Bernhard
17438.xml (1.57 KB)

2

Do you use push and websockets? Maybe yours webhosters blocking push requests?

3

I removed the push-mode and async-support from my web.xml, but unfortunately it hasn’t an impact

4

Can you paste some entries from log where exception occurred at server side?

Do you have in war own compiled wigetsets or lib/vaadin-client-compiled.jar ?

5

I guess, there is no exception at server side, when I start the application - neither in catalina.out nor in catalina.log. Or is there another log-file? The last vaadin startup protocol from catalina.out I have attached.

I have no own compiled widgetset but the file vaadin-client-compiled-7.3 in WEB-INF/lib folder.
17439.txt (6.26 KB)

6

Can you check if you have access to: http://your_address/VAADIN/vaadinBootstrap.js ?

If you don’t see anything, problem is related to your hosting. They block access to /VAADIN/ directory.

7

try add this in you web.xml file :

<session-config>
<tracking-mode>COOKIE</tracking-mode>
</session-config>
8

I tried this already - without success.

9

the URL http://www.qufis.de/YourFinex/vaadinBoostrap.js causes a 404 response.
I understood, that vaadinBoostrap.js is part of vaadin-server.jar. This file is located in WEB-INF/lib. I don’t understand why it should be reached with this URL?

10

Correct url: http://www.qufis.de/YourFinex/VAADIN/vaadinBoostrap.js displays 404.

It’s look like your provdier blocks access to VAADIN directory. I don’t know why, but without access to this directory, Vaadin cannot load all static data required to run (widgetset/theme/images). You can try move all static data to CDN like it’s explained in following article:
https://vaadin.com/blog/-/blogs/optimizing-hosting-setup

11

Can you please explain, why the URL should work, when vaadinBoostrap.js isn’t located in YourFinex/VAADIN but in YourFinex/WEB-INF/lib/vaadin-server.jar?

The permissions to VAADIN directory is as WEB-INF or META-INF set to 755.

I copied vaadinBoostrap.js to VAADIN directory - without effect. It’s very annoying to spend such much time with this problem.

Tanks
Bernhard

12

It’s working, because the webserver treats all jars from WEB-INF/lib as classpath files for your application. If you don’t have vaadinBootstrap.js in WEB-INF/VAADIN, tomcat load that file from vaadin-server.jar which contains it.

Can you try to deploy my test project (
https://github.com/LukaszByczynski/vaadin-layout-issue
) into your provider and see if it’s works?

13
14

Hi Lukasz,
actually it was a wrong configuration in the providers environment.

Thanks a lot for your help!
Bernhard