qbit/core/src/main/java/io/advantageous/qbit/reactive/CallbackBuilder.java
public <T> CallbackBuilder withListCallback(final Class<T> componentClass,
                                                final Callback<List<T>> callback) {
        this.callback = callback;
        return this;
    }
public <T> CallbackBuilder withListCallback(final Class<T> componentClass,
                                                final Callback<List<T>> callback) {
        this.callback = callback;
        return this;
    }
Builder method to set callback handler that takes a list

@param componentClass componentClass
@param callback       callback
@param <T>            T
@return this