src/main/java/com/github/fge/grappa/parsers/EventBusParser.java
public final boolean register(@Nonnull final Object listener)
    {
        bus.register(Objects.requireNonNull(listener));
        return true;
    }
public final boolean register(@Nonnull final Object listener)
    {
        bus.register(Objects.requireNonNull(listener));
        return true;
    }
Register a listener to the event bus

@param listener the listener
@return always true

@see EventBus#register(Object)