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Editorial Team
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Asked: 2026-05-26T16:50:30+00:00

In our current prototype most the standard HTML controls are replaced by an applet,

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In our current prototype most the standard HTML controls are replaced by an applet, most important the form submission is triggered by the applet.

Is there a way to call an associated action on the server side much the same way as with 

<h:commandButton action="#{ctrl.doit}"/>?

This article Applet and JSF Integration – example had the same question but not a suitable answer. The applet is a drop in replacement for a form from the viewpoint of the server. It fills dedicated (hidden) fields and submits – no direct communication to a server.

EDIT

So far, i understand there are these integration possibilities:

  • add a (hidden) UICommand and trigger it via JavaScript
  • Implement a UICommand of your own. As far as i understand, i’d define a hidden parameter for marking the applet as the form submit control, in the request processing cycle the UICommand implementation will find out and trigger the action. Maybe one should implement a virtual control (comparable to f:viewParam) as an endpoint for MethodExpressions.
  • Attach a listener, either to a (random) control or a more general event listener and do your stuff here. In this case, how is navigation done?
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1 Answer

  1. Editorial Team

    This is not possible without having a physical JSF view in the very same page which has the applet embedded. So, you should really at least have a <h:form> with a <h:commandButton> in the same page, if necessary hidden by CSS display: none;. This is simply because JSF needs to have a view state of that form in the server side, among others to prevent CSRF-like attacks. If having a physical <h:form> in the page is not a problem for you (which seems to be true in your particular case), then you can just let Applet fill the fields (if any) and click the button of the form using Applet-JavaScript communication.

    Other than that, a simple servlet or a real webservice API like JAX-RS/JAX-WS is really the best way. JSF is a component based MVC framework and not a webservice framework. That’s what my answer in that linked question is trying to make clear: use the right tool for the job.

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