GanttChart

final ChartModel model = ChartModel.New()
    .addColumn(Column.New(Column.Type.STRING, "topic", "topic"))
    .addColumn(Column.New(Column.Type.STRING, "task", "task"))
    .addColumn(Column.New(Column.Type.DATE, "startDate", "startDate"))
    .addColumn(Column.New(Column.Type.DATE, "endDate", "endDate"))
    .addColumn(Column.New(Column.Type.NUMBER, "duration", "duration"))
    .addColumn(Column.New(Column.Type.NUMBER, "percentcomplete", "percentcomplete"))
    .addColumn(Column.New(Column.Type.STRING, "dependencies", "dependencies"));

model.addRow("Research", "Find sources",
    LocalDate.of(2015, 1, 1), LocalDate.of(2015, 1, 5), null, 100, null);
model.addRow("Write", "Write paper",
    null, LocalDate.of(2015, 1, 9), Duration.ofDays(3).toMillis(), 25, "Research,Outline");
model.addRow("Cite", "Create bibliography",
    null, LocalDate.of(2015, 1, 7), Duration.ofDays(1).toMillis(), 20, "Research");
model.addRow("Complete", "Hand in paper",
    null, LocalDate.of(2015, 1, 10), Duration.ofDays(1).toMillis(), 0, "Cite,Write");
model.addRow("Outline", "Outline paper",
    null, LocalDate.of(2015, 1, 6), Duration.ofDays(1).toMillis(), 100, "Research");

this.ganttChart.setModel(model);

final Arrow arrow = Arrow.Builder()
    .angle(1) //The angle of the head of the arrow.
    .color("blue") //The color of the arrows.
    .length(4) //The length of the head of the arrow.
    .width(3) //The width of the arrows.
    .radius(0) //The radius for defining the curve of the arrow between two tasks.
    .spaceAfter(3) //The amount of whitespace between the head of an arrow and the task to which it points.
    .build();

final Gantt gantt = Gantt.Builder()
    .arrow(arrow)
    .barCornerRadius(0) //The radius for defining the curve of a bar's corners.
    .barHeight(15) //The height of the bars for tasks.
    .criticalPathEnabled(true) //If true any arrows on the critical path will be styled differently.
    .criticalPathStyle(LineStyle.New("red", 3)) //An object containing the style for any critical path arrows.
    .defaultStartDate(DateValue.Date(LocalDate.now())) //If the start date cannot be computed from the values in the DataTable, the start date will be set to this.
    .innerGridDarkTrack(BarStyle.New("white")) //The fill color of the inner grid track.
    .innerGridHorizLine(LineStyle.New("black", 3)) //Defines the style of the inner horizontal grid lines.
    .innerGridTrack(BarStyle.New("gray")) //The fill color of the inner grid track.
    .labelStyle(TextStyle.New("black", "Arial", 12)) //An object containing the styles for task labels.
    .labelMaxWidth(20) //The maximum amount of space allowed for each task label.
    .percentEnabled(true) //Fills the task bar based on the percentage completed for the task.
    .shadowColor("blue") //Defines the color of the shadows under any task bar which has dependencies.
    .shadowEnabled(true) //If set to true, draws a shadow under each task bar which has dependencies.
    .shadowOffset(4) //Defines the offset, in pixels, of the shadows under any task bar which has dependencies.
    .trackHeight(40) //The height of the tracks.
.build();

this.ganttChart.setGantt(gantt);