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Vertx - Exception Handling

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exception handling in Vert.x - vertx command line

On Failure

authenticationProvider.authenticate(authInfo)
      .onSuccess(user -> {
        System.out.println("User " + user.principal() + " is now authenticated");
      })
      .onFailure(Throwable::printStackTrace);

Error handler

In case of Internal Server Error (ie status code 500), you can catch them with an errorHandler 

router.errorHandler(500, rc -> {
            System.err.println("Handling failure");
            Throwable failure = rc.failure();
            if (failure != null) {
                failure.printStackTrace();
            }
});

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