Problem with nxt_lejos installation on ROS Hydro

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I'm trying to install nxt_lejos on ubuntu 12.04 with ROS Hydro following the official ROS documentation and by also referring to some answers found on forums. I've followed these steps:

1. successfully installed rosjava following this tutorial with several corrections from this forum
   (obviously changing all the references to ROS version to hydro-devel)

2. successfully installed lejos as prescribed the official tutorial from lejos.org website

3. trying to install nxt_lejos following this tutorial (section 1.2)

once launching shell command 'gradle installApp' I get the following error:

20:12:25.603 [ERROR] [org.gradle.BuildExceptionReporter] FAILURE: Build failed with an exception.

20:12:25.606 [ERROR] [org.gradle.BuildExceptionReporter]

20:12:25.607 [ERROR] [org.gradle.BuildExceptionReporter] * What went wrong:

20:12:25.609 [ERROR] [org.gradle.BuildExceptionReporter] Could not resolve all dependencies for configuration ':nxt_lejos_lcp_proxy:compile'.

20:12:25.610 [ERROR] [org.gradle.BuildExceptionReporter] > Could not find ros.rosjava_core:rosjava:0.0.0-SNAPSHOT.

20:12:25.612 [ERROR] [org.gradle.BuildExceptionReporter] Searched in the following locations:

20:12:25.617 [ERROR] [org.gradle.BuildExceptionReporter] file:/root/.m2/repository/ros/rosjava_core/rosjava/0.0.0-SNAPSHOT/maven-metadata.xml

20:12:25.619 [ERROR] [org.gradle.BuildExceptionReporter] file:/root/.m2/repository/ros/rosjava_core/rosjava/0.0.0-SNAPSHOT/rosjava-0.0.0-SNAPSHOT.pom

20:12:25.621 [ERROR] [org.gradle.BuildExceptionReporter] file:/root/.m2/repository/ros/rosjava_core/rosjava/0.0.0-SNAPSHOT/rosjava-0.0.0-SNAPSHOT.jar

20:12:25.624 [ERROR] [org.gradle.BuildExceptionReporter] dead_repo

20:12:25.625 [ERROR] [org.gradle.BuildExceptionReporter] dead_repo

20:12:25.643 [ERROR] [org.gradle.BuildExceptionReporter] dead_repo

20:12:25.653 [ERROR] [org.gradle.BuildExceptionReporter] Required by:

20:12:25.654 [ERROR] [org.gradle.BuildExceptionReporter] ros.nxt_lejos:nxt_lejos_lcp_proxy:0.0.0-SNAPSHOT

based on what I have read so far on this forum

it looks like the ros.rosjava_core:rosjava:0.0.0-SNAPSHOT artifact has been removed and the robotbrains repository closed;

so I have tried to modify the build.gradle file in each project included in nxt_lejos accordingly to use a newer version of the artifact (org.ros.rosjava_core:rosjava:0.1.+) and a new repository but I'm still getting a similar error (the same error as above with just a different missing artifact)

How can I install nxt_lejos avoiding these errors? Thanks in advance