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I see a couple of issues:

First, you should pull the latest version. Your line numbers don't match up with my source.

To view the source, you should be able to attach the source to rosjava.jar as you described. Make sure you select "External folder" and select the "rosjava/src" folder not the "org" folder beneath it.

Finally, I believe your problem is that you have an invalid NodeConfiguration. Admittedly, the error message could be better.

Try using: NodeConfiguration node_cfg = NodeConfiguration.createDefault();