GanttProject Developer Guide

This page provides instruction for building GanttProject from the master branch.

The instructions assume that you’re using Ubuntu-based Linux distribution. The process on other distros and Windows/Mac OSX should be similar, modulo differences in packages/paths and the way command line terminal works.

Overview of the technologies and frameworks used in the build process

GanttProject build process uses Java, Kotlin and Google Protocol Buffers compilers. Orchestrating them is not trivial, so be prepared to have some fun with setting up the things.


A bare minimum which you need is:

  1. Java SE Development Kit(JDK) version 8 from Oracle or OpenJDK. You also need JavaFX It is bundled with Oracle’s JDK, but if you’re using OpenJDK then you need to install JavaFX separately. It is available as openjfx in Ubuntu repositories.

  2. Gradle build tool for most of the development tasks. If you’re going to build DEB package or Mac OSX app you’ll also need ANT.

  3. Git version control to checkout the sources.

Please make sure that you can run java, javac, git and gradle commands.

The remaining required artifacts will be downloaded during the build process.

Checking out the sources

The source code is stored in GitHub repository. You can clone the repository using

    git clone

The rest of this page assumes that you checked out the sources using one of the ways into /tmp/ganttproject directory.


This document assumes that you work with master branch or with your own branch forked from master

Downloading the required libraries

Before building you need to download some required libraries and frameworks. Run the following command to fetch them from Maven repositories::

    cd /tmp/ganttproject/ganttproject-builder
    gradle updateLibs

Building with Gradle

If everything is OK with your environment then the following will build a binary distribution of GanttProject:

    cd /tmp/ganttproject/ganttproject-builder
    gradle distBin

The distribution is assembled in ganttproject-builder/dist-bin directory. You can run GanttProject using ganttproject or ganttproject.bat script::

    cd /tmp/ganttproject/ganttproject-builder/dist-bin

You can also start GanttProject using gradle runApp which will build a distro and launch GanttProject as necessary.

Basically, that’s everything that you need to be able to change the sources using any text editor, build and run the changed code.

Building and running from IntelliJ IDEA

The instructions below apply to IntelliJ IDEA but other popular IDEs can also be used in a similar way.

IDEA supports Gradle out of the box. You can just import GanttProject with File.New.Project from Existing Sources menu action in IDEA where you need to choose ganttproject-builder/build.gradle file. When asked about the modules, uncheck module .. as shown on the screenshot below

idea gradle import

Having completed the import, you can run GanttProject using Gradle’s runApp task. Open Gradle pane in IDEA, find task runApp in ganttproject-builder/build.gradle file, right-click and choose Run or Debug.

idea run ganttproject