How to use JSF versioning for resources in jar

PF 3.5.10, Mojarra 2.1.21, omnifaces 1.5

I have a JSF library (with css files only). This library is in a .jar file. The css will be included in xhtml with <h:outputStylesheet library="mylib" name="css/mycss.css">.

In html it is rendered to the following: localhost:8080/cms/javax.faces.resource/css/mycss.css.jsf?ln=mylib

CSS file of primefaces is rendered to: localhost:8080/cms/javax.faces.resource/primefaces.js.jsf?ln=primefaces&v=3.5.10

Notice the library version (&3.5.10) at the end. How can I do the same thing ? Should I write version in Manifest.mf. Or how can I use jsf-versioning in jar file?

Solution

That's unfortunately not possible. Library versioning is not supported for resources in JAR.

You've basically 2 options:

Do it the easy and ugly way, include server's startup time as query string. Given that you're using OmniFaces, you could use its builtin #{startup} managed bean referring a java.util.Date instance in application scope:
```
<h:outputStylesheet ... name="some.css?#{startup.time}" />
<h:outputScript ... name="some.js?#{startup.time}" />
```
Or perhaps you've the version already as some application variable.
```
<h:outputStylesheet ... name="some.css?v=#{app.version}" />
<h:outputScript ... name="some.js?v=#{app.version}" />
```
Update: Notwithstanding, this doesn't work for <h:outputStylesheet>. See also: https://github.com/javaserverfaces/mojarra/issues/3945 or https://github.com/javaee/javaserverfaces-spec/issues/1395

It works for <h:outputScript> though, which had a very simliar bug report which was implemented pretty soon https://github.com/javaserverfaces/mojarra/issues/1216

Do the same as PrimeFaces, create a custom ResourceHandler.

public class MyVersionResourceHandler extends ResourceHandlerWrapper {

    private ResourceHandler wrapped;

    public MyVersionResourceHandler(ResourceHandler wrapped) {
        this.wrapped = wrapped;
    }

    @Override
    public Resource createResource(String resourceName) {
        return createResource(resourceName, null, null);
    }

    @Override
    public Resource createResource(String resourceName, String libraryName) {
        return createResource(resourceName, libraryName, null);
    }

    @Override
    public Resource createResource(String resourceName, String libraryName, String contentType) {
        final Resource resource = super.createResource(resourceName, libraryName, contentType);

        if (resource == null) {
            return null;
        }

        return new ResourceWrapper() {

            @Override
            public String getRequestPath() {
                return super.getRequestPath() + "&v=1.0";
            }

            @Override // Necessary because this is missing in ResourceWrapper (will be fixed in JSF 2.2).
            public String getResourceName() {
                return resource.getResourceName();
            }

            @Override // Necessary because this is missing in ResourceWrapper (will be fixed in JSF 2.2).
            public String getLibraryName() {
                return resource.getLibraryName();
            }

            @Override // Necessary because this is missing in ResourceWrapper (will be fixed in JSF 2.2).
            public String getContentType() {
                return resource.getContentType();
            }

            @Override
            public Resource getWrapped() {
                return resource;
            }
        };
    }

    @Override
    public ResourceHandler getWrapped() {
        return wrapped;
    }

}

Or if you happen to already use OmniFaces, it could be done simpler:

public class YourVersionResourceHandler extends DefaultResourceHandler {

    public YourVersionResourceHandler(ResourceHandler wrapped) {
        super(wrapped);
    }

    @Override
    public Resource decorateResource(Resource resource) {
        if (resource == null || !"mylib".equals(resource.getLibraryName())) {
            return resource;
        }

        return new RemappedResource(resource, resource.getRequestPath() + "&v=1.0");
    }

}

Either way, to get it to run, register it as <resource-handler> in /META-INF/faces-config.xml of the JAR.

<application>
    <resource-handler>com.example.MyVersionResourceHandler</resource-handler>
</application>