Ask HN: Best introduction to Web-Application programming?

Hi all,

  I'm a recent graduate. My work is on a Java-based web-app:
  -Essentially all Java, except for views in Groovy;
  -Using Hibernate for ORM;
  -Using Guice for DI;
  -Mostly deployed on Tomcat.

  Now, as an inexperienced developer I'm quite comfortable with 
  Java but the rest are new to me. Of course I would like 
  to learn more about them. Could you recommend any
  books/lectures/online resources for

  -something rather general as I never did any web-development 
  (html/css, POST/GET, sockets, deployment);
  -ORM/Hibernate;
  -DI/Guice;
  -web-app architecture/design?

  Preferably not deep reference books at this point, 
  but something that would allow me to better understand

  -what they do;
  -how they do it;
  -and how that fits into the whole picture.