How to list all routes in Java [Play 2.5]

[Rodrigo Sol]

Hi Guys,

I need to list all routes from a unit testing using Java. I found some scala examples, but I could not implement them in java.

Can someone provides me some code snippet?

Thanks

[Greg Methvin]

Hi Rodrigo,

You can inject your Router (the Java play.routing.Router) and call router.documentation(). That gives you a list of RouteDocumentation objects that include the method, path pattern, and a string representing the controller invocation.

I think we are actually missing documentation for the Java Router object. That was a new Java API we added in 2.5.

Greg

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Greg Methvin

Senior Software Engineer

Lightbend, Inc.

[Rodrigo Sol]

Hi Greg,

Actually I just made this work using: 

List<Router.RouteDocumentation> myRoutes = app.getWrappedApplication().routes().asJava().documentation();

Should I choose this new API over the code above, or it does not matter?

Thank you

[Greg Methvin]

The routes method of Application is deprecated, so it would be best to avoid that. In a test, it should be acceptable to get the instance from the injector directly:

app.injector().instanceOf(play.routing.Router.class).documentation()

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[Brainztorm]

Hi,

I made this work with :

public class Application extends Controller {

    @Inject
    private Provider<Router> router;


    public Result home() {
        List<Router.RouteDocumentation> rds = router.get().documentation();

...

Thanks to Greg advice here : https://groups.google.com/forum/#!searchin/play-framework/routes$20list|sort:relevance/play-framework/vEYA2m_vxCU/2Adn3-YgBAAJ

Play framework is becoming so complexe ! Is there someone here that can explain why we need a "Provider<Router>" and not a simple "Router" ?

I find it very difficult to find documentation about DI in play and where i can find other Play entities like Router i can use ... any ressources/videos/books ?

Thanks !!

François

[Christian Schmitt]

It's not complex, but you are doing something that *can* be quite complex.

consider class a and class b if class a depends on class b it's nearly impossible that class b also depends on class a, since that would bea cycle dependency.
Even if you write that in java code you would need a object in between that handle's that for you. Since a can't be created without b and vice versa.

A provider injection can handle that case for you.
https://github.com/google/guice/wiki/CyclicDependencies

[Greg Methvin]

It's actually much simpler to reason about than it used to be, especially when you're dealing with third-party code that depends on various Play components.

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Greg Methvin

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Lightbend, Inc.

[Brainztorm]

Hi, thanks to both of you !

It's much clearer now.

Another question ... where i can find the others Play entities/components/libs that we can use ? ( i now can inject the Router but what other things can i inject too :) is there a list somewhere ?)

Have a great day !