Today I Learned

Stuff I wish someone else had written down.

Current Servlet Request in a CDI Bean

How to inject the current request into a @RequestScoped CDI bean:

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import javax.inject.Provider;

@RequestScoped
class Foo {

    private final Provider<HttpServletRequest> currentRequestProvider;
    
    @Inject
    public Foo(Provider<HttpServletRequest> currentRequestProvider) {
        this.currentRequestProvider = currentRequestProvider;
    }
    
    @PostConstruct
    public void postConstruct() {
        currentRequestProvider.get().getRequestURL()
    }
}

You must wrap the request in a Provider or else the application server will complain that there does not (yet) exist a bean of that type.

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