A component for Apache Isis' Wicket Viewer that render entities (implementing CalendarEvent) within a calendar.
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This component, intended for use with Apache Isis's Wicket viewer, renders events for a collection of entities within a fullpage calendar. Underneath the covers it uses this fullcalendar widget.


The following screenshots show an example app’s usage of the component.

Install fixtures

Install fixtures for the example app:

010 install fixtures

Parented collection as calendar

The todo item’s collection contains a list of Calendarable entities (also todo items); this is indicated through a button to switch the view:

020 calendar button for parented collection

Clicking the button shows the same entities on a fullpage calendar:

030 view items in calendar

Drill down

Clicking on the event in the calendar drills down to the corresponding entity:

040 drill down

Standalone collection as calendar

Invoking an action that returns a list of Calendarable entities:

050 view all

/…​ also results in the button to view in a fullpage calendar:

060 calendar button for standalone collection

Each item is shown in the calendar view:

070 toggle calendars


Each entity can provides dates to either a single calendar or to multiple calendars. In the example app each todo item exposes its dueBy date to a single calendar, named after its category:

public String getCalendarName() {
    return getCategory().name();
public CalendarEvent toCalendarEvent() {
    if(getDueBy() == null) {
        return null;
    return new CalendarEvent(getDueBy().toDateTimeAtStartOfDay(), getCalendarName(), container.titleOf(this));

The full page calendar uses colour coding to indicate the calendars, as well as checkboxes to show/hide each calendar. Unchecking the calendar toggle hides all events in that calendar:

080 calendar updated

How to run the Demo App

The prerequisite software is:

  • Java JDK 8 (>= 1.9.0) or Java JDK 7 (⇐ 1.8.0)

    • note that the compile source and target remains at JDK 7

  • maven 3 (3.2.x is recommended).

To build the demo app:

git clone https://github.com/isisaddons/isis-wicket-fullcalendar2.git
mvn clean install

To run the demo app:

mvn antrun:run -P self-host

Then log on using user: sven, password: pass

API & Usage

Each entity must implement either the CalendarEventable interface or the Calendarable interface:

CalendarEventable` interface

Of the two interfaces, CalendarEventable interface is the simpler, allowing the object to return a single CalendarEvent:

public interface CalendarEventable {
    String getCalendarName();           (1)
    CalendarEvent toCalendarEvent();    (2)
  1. groups similar events together; in the UI these correspond to checkboxes rendered near the top.

  2. returns a CalendarEvent value type representing the data to be rendered on the calender.

CalendarEvent itself is:

public class CalendarEvent implements Serializable {
    private final DateTime dateTime;
    private final String calendarName;
    private final String title;
    private final String notes;
    public CalendarEvent(
            final DateTime dateTime,
            final String calendarName,
            final String title) {
        this(dateTime, calendarName, title, null);
    public CalendarEvent(
            final DateTime dateTime,
            final String calendarName,
            final String title,
            final String notes) {
        this.dateTime = dateTime;
        this.calendarName = calendarName;
        this.title = title;
        this.notes = notes;

In the demo app, the ToDoItem implements CalendarEventable.

Calendarable interface

While the CalendarEventable interface will fit many requirements, sometimes an object will have several dates associated with it. For example, one could imagine an object with start/stop dates, or optionExercise/optionExpiry dates.

The Calendarable interface therefore allows the object to return a number of CalenderEvents; each is qualified (identified) by a calendarName:

public interface Calendarable {
    Set<String> getCalendarNames();
    ImmutableMap<String, CalendarEventable> getCalendarEvents();


Sometimes the domain object that implements Calendarable or CalendarEventable will be a supporting object such as a Note attached to an Order, say. When the marker is clicked in the calendar, we would rather that the UI opens up the Order rather than the associated Note (in other words, saving a click).

This requirement is supported by providing an implementation of the CalendarableDereferencingService:

public interface CalendarableDereferencingService {
	Object dereference(final Object calendarableOrCalendarEventable);

for example, one might have:

public class LocationDereferencingServiceForNote implements CalendarableDereferencingService {
	public Object dereference(final Object calendarableOrCalendarEventable) {
		if (!(locatable instanceof Note)) {
			return null;
		final Note note = (Note) calendarableOrCalendarEventable;
		return note.getOwner();

Note that there can be multiple implementations of this service; the component will check all that are available. The order in which they are checked depends upon the @DomainServiceLayout(menuOrder=…​) attribute.

How to configure/use

You can either use this extension "out-of-the-box", or you can fork this repo and extend to your own requirements.


To use "out-of-the-box", add this component to your project’s dom module’s pom.xml, eg:


Check for later releases by searching Maven Central Repo.

"Out-of-the-box" (-SNAPSHOT)

If you want to use the current -SNAPSHOT, then the steps are the same as above, except:

  • when updating the classpath, specify the appropriate -SNAPSHOT version:

  • add the repository definition to pick up the most recent snapshot (we use the Cloudbees continuous integration service). We suggest defining the repository in a <profile>:


Forking the repo

If instead you want to extend this component’s functionality, then we recommend that you fork this repo. The repo is structured as follows:

  • pom.xml - parent pom

  • cpt - the component implementation

  • fixture - fixtures, holding sample domain object classes and fixture scripts

  • webapp - demo webapp (see above screenshots)

Only the cpt project is released to Maven central. The versions of the other modules are purposely left at 0.0.1-SNAPSHOT because they are not intended to be released.

Change Log

  • 1.14.0 - released against Isis 1.14.0

  • 1.13.0 - released against Isis 1.13.0

  • 1.12.0 - released against Isis 1.12.0

  • 1.11.0 - released against Isis 1.11.0

  • 1.10.0 - released against Isis 1.10.0; CalendarableDereferencingService

  • 1.9.0 - released against Isis 1.9.0

  • 1.8.0 - released against Isis 1.8.0

  • 1.7.0 - released against Isis 1.7.0

  • 1.6.1 - (breaking change) changed package names for API to org.isisaddons.wicket.fullcalendar2.cpt.applib

  • 1.6.0 - re-released as part of isisaddons, changed package names for API to org.isisaddons.wicket.fullcalendar2.applib


Copyright 2013~2016 Dan Haywood

Licensed under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at


Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.


In addition to Apache Isis, this component depends on:

Maven deploy notes

Only the cpt module is deployed, and is done so using Sonatype’s OSS support (see user guide).

Release to Sonatype’s Snapshot Repo

To deploy a snapshot, use:

pushd cpt
mvn clean deploy

The artifacts should be available in Sonatype’s Snapshot Repo.

Release an Interim Build

If you have commit access to this project (or a fork of your own) then you can create interim releases using the interim-release.sh script.

The idea is that this will - in a new branch - update the dom/pom.xml with a timestamped version (eg It then pushes the branch (and a tag) to the specified remote.

A CI server such as Jenkins can monitor the branches matching the wildcard origin/interim/* and create a build. These artifacts can then be published to a snapshot repository.

For example:

sh interim-release.sh 1.14.0 origin


  • 1.15.0 is the base release

  • origin is the name of the remote to which you have permissions to write to.

Release to Maven Central

The release.sh script automates the release process. It performs the following:

  • performs a sanity check (mvn clean install -o) that everything builds ok

  • bumps the pom.xml to a specified release version, and tag

  • performs a double check (mvn clean install -o) that everything still builds ok

  • releases the code using mvn clean deploy

  • bumps the pom.xml to a specified release version

For example:

sh release.sh 1.14.0 \
              1.15.0-SNAPSHOT \
              dan@haywood-associates.co.uk \
              "this is not really my passphrase"

where * $1 is the release version * $2 is the snapshot version * $3 is the email of the secret key (~/.gnupg/secring.gpg) to use for signing * $4 is the corresponding passphrase for that secret key.

Other ways of specifying the key and passphrase are available, see the `pgp-maven-plugin’s documentation).

If the script completes successfully, then push changes:

git push origin master && git push origin 1.14.0

If the script fails to complete, then identify the cause, perform a git reset --hard to start over and fix the issue before trying again. Note that in the cpt’s `pom.xml the nexus-staging-maven-plugin has the autoReleaseAfterClose setting set to true (to automatically stage, close and the release the repo). You may want to set this to false if debugging an issue.

According to Sonatype’s guide, it takes about 10 minutes to sync, but up to 2 hours to update search.