It may sound stupid. I am actually a product management guy with a business knowledge and never programmed. I am 38 years old and eager to learn to Java and then get into J2EE. This for the sake of learning and for fun. It would be great if someone can share their experiences and suggestions.
Get the latest edition of this book - Head First Java
If you work on a Java/J2EE based project, ask one of the developers to show you how to setup a development environment on your system so that you can update to the latest code and build and run stuff on your own system.
Start trying to get involved in discussions of 'how to do stuff' with the developers besides the 'what to do' discussions that you are probably already involved in.