How to send to a different application root?

[hilco]

Hi all,

I have what is essentially a "backend.war" (database and ReST stuff) and a "frontend.war" (HTML, CSS, and GWT generated JS) which do not necessarily run on the same server. When sending a message from "frontend.war", Errai uses its application root so the message is sent to http://www.company.com/frontend instead of http://www.company.com/backend.

Without Apache rewriting things, how do I get Errai to send the messages to the right URL?

Cheers,

Hilco

[hilco]

I just discovered ClientMessageBusImpl#setApplicationRoot. Let's see if that helps.

[hilco]

So not really.

If I add setApplicationRoot to MainEntryPoint's constructor (or even its static initialization block) then the test message I try to send myself (from MainEntryPoint) is aimed at /backend but the very first (ConnectToQueue) still goes to /frontend.

How can I set the application root? Is that even the right approach? Any help would be appreciated.

[csa]

Hi,

Yes you're on the right path. This is a new feature that didn't make it into the docs yet.

You should be able to configure the application root using a JavaScript variable (erraiBusApplicationRoot) either directly in your host page or using JSNI. Here's an example for errai-jaxrs:

https://docs.jboss.org/author/display/ERRAI/Errai+JAX-RS+Configuration

Note that for errai-bus the variable is called erraiBusApplicationRoot.

Cheers,

Christian

[hilco]

The JSNI approach didn't work (i.e. it gave the same behaviour as using ClientMessageBusImpl#setApplicationRoot) so I guess it is invoked too late. Setting erraiBusApplicationRoot directly in the index.html does indeed work. Woohoo! :-)

Is there a way to use the JSNI approach (or better yet use ClientMessageBusImpl#setApplicationRoot)? I mean, how do I call it earlier? I would prefer not touching the index.html for this.

[csa]

Right now the host page is your only reliable option. I have created a JIRA to fix this so that setting the app root programmatically before the bus starts becomes possible: https://issues.jboss.org/browse/ERRAI-380

[hilco]

All right. Thanks for creating the issue in JIRA; I've added my vote. :-)