How to generate JSON response from JSF?

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JSF is a MVC framework generating HTML, not some kind of a REST web service framework. You’re essentially abusing JSF as a web service. Your concrete problem is simply caused by placing <html> tags and so on in the view file yourself.

If you really insist, then you can always achieve this by using <ui:composition> instead of <html>. You also need to make sure that the right content type of application/json is been used, this defaults in JSF namely to text/html.

<ui:composition
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:ui="http://java.sun.com/jsf/facelets">
    <f:event type="preRenderView" listener="#{bean.renderJson}" />
</ui:composition>

with

public void renderJson() throws IOException {
    FacesContext facesContext = FacesContext.getCurrentInstance();
    ExternalContext externalContext = facesContext.getExternalContext();
    externalContext.setResponseContentType("application/json");
    externalContext.setResponseCharacterEncoding("UTF-8");
    externalContext.getResponseOutputWriter().write(someJsonString);
    facesContext.responseComplete();
}

But I strongly recommend to look at JAX-RS or JAX-WS instead of abusing JSF as a JSON web service. Use the right tool for the job.

See also:

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