title: How to inject String constants easily with Weld?
body: <p>We have a situation where we provide an external configuration in form of a Map to our running programs.  I have found that JSR-330 Dependency Injection gives a much cleaner way to use that configuration map in the code instead of passing the map around or to use JNDI to get it.</p>
  
  <pre><code>@Inject @Named("server.username") String username;
  </code></pre>
  
  <p>lets the JSR-330 implementation fill in this field automatically.</p>
  
  <p>With Guice I can set the value with</p>
  
  <pre><code>bindConstant().annotatedWith(Names.named(key)).to(value);
  </code></pre>
  
  <p>I would like to be able to do the same in Weld (bind "server.username" to e.g. "foobar") and I understand that the mechanism most likely is beans.xml, but I would prefer a simple "feed this map to Weld, please" code alternative.  What would be a good way to do this?</p>
  
  <hr>
  
  <p>EDIT 2013-10-16: After looking into Dagger which works at compile time and not runtime, I found that with us usually having 10-20 per program we could live with having a <code>@Provider</code> method for each configuration string which then looks up in the configuration map. This allows for method specific behavior (including default values), ability to provide javadoc, and ability to put all these methods in the same class.  Also it works well with Weld out of the box. I am considering writing a fuller explanation in a blog entry.</p>