I just added
export VERTX_OPTS='-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=8000'
environment variable, now when I start up vertx from the command line it is listening to port 8000. Then I just have a remote debug run configuration, change the port to 8000 and click the Run Debug button to run, and it connects.
Real simple
Mark