This is the release notes for XWiki Platform, XWiki Enterprise and XWiki Enterprise Manager. They share the same release notes as they are released together and have the same version.

This is the second and last milestone of the XWiki 4.3 version (Roadmap). This release brings a new and experimental Solr Search engine, new default date, user and group pickers, a new localization module allowing applications to register translations, REST API additions and various other improvements.

New and Noteworthy (since XWiki 4.3 Milestone 1)

Experimental Solr based search engine

A new and experimental search engine based on Apache Solr is now available.

The new search UI offers advanced search features and results highlighting. Future versions will also include Faceted Search.

The new engine has it's own index, separate from the Lucene one, which is stored by default in the <permanent directory>/solr folder. In the same folder you can also access Solr's configuration files together with the index's schema.xml which you can tweak to achieve better results. To change this folder's location, you can either pass the -Dsolr.solr.home system property when you start the application container (tomcat/jetty/etc.) or you can set the search.solr.home property in WEB-INF/xwiki.properties.

For now, indexing is done only manually by using the Search Administration UI. Because of this, in order to get any search results, you have to go to Administration > Applications > Search and index/reindex the wiki. Any changes in the content of the wiki will not be searchable until you manually reindex. This limitation will be removed in future versions, once the feature matures.

This new search engine is not enable by default, since Lucene is still the default one, but, if you wish to try it out, it can be enable by going to Administration > Applications > Search > Search engine to use and selecting Solr (Experimental).

Default date picker

The date picker from AppWithinMinutes is now the default picker for all XClass properties of type Date. This means that you'll get a date picker when editing an object with a Date property even if you didn't use AppWithinMinutes to create the XClass.

If for some reason you don't want to use the new date picker then you can edit the XClass and uncheck "Use Date Picker" for the Date property.

User and Group picker

We added a user and group picker that is used by default for all XClass properties of type "List of Users" and "List of Groups". When multiple selection is enabled, each selected user is added to the list above the picker. You can remove individual users from the list of selected users or you can clear the entire list.

In single selection mode whenever you select an user it overwrites the previously selected user.

The list of selected users is displayed in view mode in a similar way. For each user there is a link to their profile page.

The group picker behaves in the same way. The group alias is the name of the group document, the group name is the title of the group document while the group avatar is the first image attached to the group document.

The user and group picker can be configured to display a scope toggle that can be used to switch between local and global user/group suggestions.

You can check this if you edit a group from a subwiki (in a multiwiki environment).

New 'Title' and 'Content' fields for App Within Minutes

We added two new field types to the field palette: Title and Content. They are very useful if you want to store some of your data in the title and/or the content of your application entries. All the rest of the field types store their values in object properties, i.e. in an object attached to the application entry. See the App Within Minutes documentation for more details.

Miscellaneous

• Search Admin UI improvements ():

  

• Automatically register translations for the FAQ and IRCBot applications

See the full list of JIRA issues fixed in this release.

For Developers

New Localization Module

A new localization module has been introduced to replace the old XWikiMessageTool.

See Localization Module for more details.

REST API Improvements

Some improvements have been done to the REST API with respect to wiki management.

• XARs can be imported in Wikis by POSTing it to the /wikis/{wikiName}
• New wikis can be created using the /wikimanager resource. (This resource is only available with XWiki Enterprise Manager)

For more information see XWiki RESTful API

In addition there was an XWiki REST API refactoring done with the introduction of a new xwiki-platform-rest-api module containing all resource declarations. This is important for client and modules willing to use the REST API so that they can have all the information about resources using Java annotation. See XWiki RESTful API.

Easy creation of new XClass property types

It's now possible to create your own XClass property types without having to patch XWiki's old core. Adding a new property type is as easy as implementing a component. This means you can extend the class editor and even the App Within Minutes.

Execution context property declarations

Execution context properties can now be associated with various metadata attributes.  See the documentation on the execution context for more information.

New Scope property for wiki components and UI extensions

A scope can now be defined for wiki components and UI extensions, it allows to restrict for which wiki(s) or which user they will be available:

• Current Wiki, the component/UI extension will be available in the current wiki
• Global, the component/UI extension will be available in all the wikis (wiki farms)
• Current User, the component/UI extension will only be available for its author

Upgrades

The following dependencies have been upgraded:

• guava 13.0.1
• Lucene 3.6.1
• XStream 1.4.3
• commons-io 2.4
• httpclient 4.2.2
• commons-configuration 1.9
• jcl-over-slf4j and log4j-over-slf4j 1.7.2
• Groovy 1.8.7 1.8.8
• JGroups 3.2.0.Final
• Xerces-J 2.10.0
• JavaMail 1.4.5

Miscellaneous

• Fixed a bug about incorrect results in multi-wiki lucene search in the REST API.
• Add a java.util.Locale converter which allow:
  • using Locale in rendering macro parameter(s)
  • support Java method with Locale parameter(s) in Velocity. See Method Arguments Uberspector for more details.
• Various String language based API of com.xpn.xwiki.XWiki and com.xpn.xwiki.doc.XWikiDocument classes are now deprecated for their newly introduced java.util.Locale equivalents.

Translations

The following translations have been updated: 

• Danish
• German
• French

Known issues

• Bugs we know about

Backward Compatibility and Migration Notes

General Notes

You may also want to import the default wiki XAR in order to benefit from all the improvements listed above.

Issues specific to XWiki 4.3 Milestone 2

• The methods setUrlPatternMatcher and getUrlPatternMatcher have been removed from the core class com.xpn.xwiki.XWiki.  The underlying URLPatternMatcher could not really be used as a singleton instance and was causing irregular failures in the basic authentication method.  Thus these methods cannot be meaningfully relied upon and have therefore been removed.
• When setting the value using setValue (or setList) on a list field in an XWiki object, the list will now be copied.  To be able to update the list, you must call getValue (or getList) and update the returned list.  This is due to .
• The behaviour of com.xpn.xwiki.api.PropertyClass#getClassType() (public API) and com.xpn.xwiki.objects.classes.PropertyClass#getClassType() (protected API) has changed. They don't return the canonical Java class name of the property implementation anymore but an implementation hint. Here's the code:
  /**
   * Each type of XClass property is identified by a string that specifies the data type of the property value (e.g.
   * 'String', 'Number', 'Date') without disclosing implementation details. The internal implementation of an XClass
   * property type can change over time but its {@code classType} should not.
   * <p>
   * The {@code classType} can be used as a hint to lookup various components related to this specific XClass property
   * type. See {@link com.xpn.xwiki.internal.objects.classes.PropertyClassProvider} for instance.
   *
   * @return an identifier for the data type of the property value (e.g. 'String', 'Number', 'Date')
   */
  public String getClassType()
  {
     // By default the hint is computed by removing the Class suffix, if present, from the Java simple class name
     // (without the package). Subclasses can overwrite this method to use a different hint format.
     return StringUtils.removeEnd(getClass().getSimpleName(), "Class");
  }

  This means that instead of returning com.xpn.xwiki.objects.classes.DBListClass these methods now return DBList. This is due to .

API Breakages

The following APIs were modified since 4.2:

• [Young API] Introduce API to associate dependency status to the namespace.
  org.xwiki.extension.InstalledExtension: Method 'public boolean isDependency(java.lang.String)' has been added to an interface

• [Young API] Introduce ExtensionRepositoryDescriptor as a replacement of ExtensionRepositoryId
  org.xwiki.extension.ExtensionManagerConfiguration: Method 'public java.util.Collection getExtensionRepositoryDescriptors()' has been added to an interface
  org.xwiki.extension.repository.ExtensionRepository: Method 'public org.xwiki.extension.repository.ExtensionRepositoryDescriptor getDescriptor()' has been added to an interface
  org.xwiki.extension.repository.ExtensionRepositoryFactory: Method 'public org.xwiki.extension.repository.ExtensionRepository createRepository(org.xwiki.extension.repository.ExtensionRepositoryDescriptor)' has been added to an interface
  org.xwiki.extension.repository.ExtensionRepositoryManager: Method 'public org.xwiki.extension.repository.ExtensionRepository addRepository(org.xwiki.extension.repository.ExtensionRepositoryDescriptor)' has been added to an interface
  org.xwiki.extension.repository.ExtensionRepositorySource: Method 'public java.util.Collection getExtensionRepositoryDescriptors()' has been added to an interface

• The userdirectory and usertools plugins have been retired
  com.xpn.xwiki.plugin.userdirectory.Group: Class com.xpn.xwiki.plugin.userdirectory.Group removed
  com.xpn.xwiki.plugin.userdirectory.UserDirectoryPlugin: Class com.xpn.xwiki.plugin.userdirectory.UserDirectoryPlugin removed
  com.xpn.xwiki.plugin.userdirectory.UserDirectoryPluginAPI: Class com.xpn.xwiki.plugin.userdirectory.UserDirectoryPluginAPI removed
  com.xpn.xwiki.plugin.usertools.XWikiUserManagementTools: Class com.xpn.xwiki.plugin.usertools.XWikiUserManagementTools removed
  com.xpn.xwiki.plugin.usertools.XWikiUserManagementToolsAPI: Class com.xpn.xwiki.plugin.usertools.XWikiUserManagementToolsAPI removed
  com.xpn.xwiki.plugin.usertools.XWikiUserManagementToolsImpl: Class com.xpn.xwiki.plugin.usertools.XWikiUserManagementToolsImpl removed

• This should be fixed: a new 'sendMessageFromTemplate' method was added before the 4.2 release and then removed only from master (4.3-SNAPSHOT). We need to decide what we do with this method.
  com.xpn.xwiki.plugin.mailsender.MailSender: Method 'public int sendMessageFromTemplate(java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.util.Map)' has been removed

• Many REST API module classes that were not meant to be public have been moved to internal package.
  org.xwiki.rest.ComponentsObjectFactory: Class org.xwiki.rest.ComponentsObjectFactory removed
  org.xwiki.rest.Constants: Field ALLOWED_VALUES_ATTRIBUTE_NAME has been removed, but it was previously a constant
  org.xwiki.rest.Constants: Field RELEASABLE_COMPONENT_REFERENCES has been removed, but it was previously a constant
  org.xwiki.rest.Constants: Field XWIKI_COMPONENT_MANAGER has been removed, but it was previously a constant
  org.xwiki.rest.DomainObjectFactory: Class org.xwiki.rest.DomainObjectFactory removed
  org.xwiki.rest.RangeIterable: Class org.xwiki.rest.RangeIterable removed
  org.xwiki.rest.Utils: Class org.xwiki.rest.Utils removed
  org.xwiki.rest.XWikiAuthentication: Class org.xwiki.rest.XWikiAuthentication removed
  org.xwiki.rest.XWikiJaxRsApplication: Class org.xwiki.rest.XWikiJaxRsApplication removed
  org.xwiki.rest.XWikiRestletJaxRsApplication: Class org.xwiki.rest.XWikiRestletJaxRsApplication removed
  org.xwiki.rest.XWikiRestletServlet: Class org.xwiki.rest.XWikiRestletServlet removed
  org.xwiki.rest.XWikiSecretVerifier: Class org.xwiki.rest.XWikiSecretVerifier removed
  org.xwiki.rest.XWikiSetupCleanupFilter: Class org.xwiki.rest.XWikiSetupCleanupFilter removed
  org.xwiki.rest.exceptions.QueryExceptionMapper: Class org.xwiki.rest.exceptions.QueryExceptionMapper removed
  org.xwiki.rest.exceptions.XWikiExceptionMapper: Class org.xwiki.rest.exceptions.XWikiExceptionMapper removed
  org.xwiki.rest.representations.TextPlainReader: Class org.xwiki.rest.representations.TextPlainReader removed
  org.xwiki.rest.representations.comments.FormUrlEncodedCommentReader: Class org.xwiki.rest.representations.comments.FormUrlEncodedCommentReader removed
  org.xwiki.rest.representations.comments.TextPlainCommentReader: Class org.xwiki.rest.representations.comments.TextPlainCommentReader removed
  org.xwiki.rest.representations.objects.FormUrlEncodedObjectReader: Class org.xwiki.rest.representations.objects.FormUrlEncodedObjectReader removed
  org.xwiki.rest.representations.objects.FormUrlEncodedPropertyReader: Class org.xwiki.rest.representations.objects.FormUrlEncodedPropertyReader removed
  org.xwiki.rest.representations.objects.TextPlainPropertyReader: Class org.xwiki.rest.representations.objects.TextPlainPropertyReader removed
  org.xwiki.rest.representations.pages.FormUrlEncodedPageReader: Class org.xwiki.rest.representations.pages.FormUrlEncodedPageReader removed
  org.xwiki.rest.representations.pages.TextPlainPageReader: Class org.xwiki.rest.representations.pages.TextPlainPageReader removed
  org.xwiki.rest.representations.tags.FormUrlEncodedTagsReader: Class org.xwiki.rest.representations.tags.FormUrlEncodedTagsReader removed
  org.xwiki.rest.representations.tags.TextPlainTagsReader: Class org.xwiki.rest.representations.tags.TextPlainTagsReader removed
  org.xwiki.rest.resources.BaseAttachmentsResource: Class org.xwiki.rest.resources.BaseAttachmentsResource removed
  org.xwiki.rest.resources.BaseAttachmentsResource$AttachmentInfo: Class org.xwiki.rest.resources.BaseAttachmentsResource$AttachmentInfo removed
  org.xwiki.rest.resources.BaseSearchResult: Class org.xwiki.rest.resources.BaseSearchResult removed
  org.xwiki.rest.resources.BaseSearchResult$SearchScope: Class org.xwiki.rest.resources.BaseSearchResult$SearchScope removed
  org.xwiki.rest.resources.BrowserAuthenticationResource: Class org.xwiki.rest.resources.BrowserAuthenticationResource removed
  org.xwiki.rest.resources.ModificationsResource: Class org.xwiki.rest.resources.ModificationsResource removed
  org.xwiki.rest.resources.RootResource: Class org.xwiki.rest.resources.RootResource removed
  org.xwiki.rest.resources.SyntaxesResource: Class org.xwiki.rest.resources.SyntaxesResource removed
  org.xwiki.rest.resources.attachments.AttachmentAtPageVersionResource: Class org.xwiki.rest.resources.attachments.AttachmentAtPageVersionResource removed
  org.xwiki.rest.resources.attachments.AttachmentHistoryResource: Class org.xwiki.rest.resources.attachments.AttachmentHistoryResource removed
  org.xwiki.rest.resources.attachments.AttachmentResource: Class org.xwiki.rest.resources.attachments.AttachmentResource removed
  org.xwiki.rest.resources.attachments.AttachmentVersionResource: Class org.xwiki.rest.resources.attachments.AttachmentVersionResource removed
  org.xwiki.rest.resources.attachments.AttachmentsAtPageVersionResource: Class org.xwiki.rest.resources.attachments.AttachmentsAtPageVersionResource removed
  org.xwiki.rest.resources.attachments.AttachmentsResource: Class org.xwiki.rest.resources.attachments.AttachmentsResource removed
  org.xwiki.rest.resources.classes.ClassPropertiesResource: Class org.xwiki.rest.resources.classes.ClassPropertiesResource removed
  org.xwiki.rest.resources.classes.ClassPropertyResource: Class org.xwiki.rest.resources.classes.ClassPropertyResource removed
  org.xwiki.rest.resources.classes.ClassResource: Class org.xwiki.rest.resources.classes.ClassResource removed
  org.xwiki.rest.resources.classes.ClassesResource: Class org.xwiki.rest.resources.classes.ClassesResource removed
  org.xwiki.rest.resources.comments.CommentResource: Class org.xwiki.rest.resources.comments.CommentResource removed
  org.xwiki.rest.resources.comments.CommentVersionResource: Class org.xwiki.rest.resources.comments.CommentVersionResource removed
  org.xwiki.rest.resources.comments.CommentsResource: Class org.xwiki.rest.resources.comments.CommentsResource removed
  org.xwiki.rest.resources.comments.CommentsVersionResource: Class org.xwiki.rest.resources.comments.CommentsVersionResource removed
  org.xwiki.rest.resources.objects.AllObjectsForClassNameResource: Class org.xwiki.rest.resources.objects.AllObjectsForClassNameResource removed
  org.xwiki.rest.resources.objects.BaseObjectsResource: Class org.xwiki.rest.resources.objects.BaseObjectsResource removed
  org.xwiki.rest.resources.objects.ObjectAtPageVersionResource: Class org.xwiki.rest.resources.objects.ObjectAtPageVersionResource removed
  org.xwiki.rest.resources.objects.ObjectPropertiesAtPageVersionResource: Class org.xwiki.rest.resources.objects.ObjectPropertiesAtPageVersionResource removed
  org.xwiki.rest.resources.objects.ObjectPropertiesResource: Class org.xwiki.rest.resources.objects.ObjectPropertiesResource removed
  org.xwiki.rest.resources.objects.ObjectPropertyAtPageVersionResource: Class org.xwiki.rest.resources.objects.ObjectPropertyAtPageVersionResource removed
  org.xwiki.rest.resources.objects.ObjectPropertyResource: Class org.xwiki.rest.resources.objects.ObjectPropertyResource removed
  org.xwiki.rest.resources.objects.ObjectResource: Class org.xwiki.rest.resources.objects.ObjectResource removed
  org.xwiki.rest.resources.objects.ObjectsAtPageVersionResource: Class org.xwiki.rest.resources.objects.ObjectsAtPageVersionResource removed
  org.xwiki.rest.resources.objects.ObjectsForClassNameResource: Class org.xwiki.rest.resources.objects.ObjectsForClassNameResource removed
  org.xwiki.rest.resources.objects.ObjectsResource: Class org.xwiki.rest.resources.objects.ObjectsResource removed
  org.xwiki.rest.resources.pages.ModifiablePageResource: Class org.xwiki.rest.resources.pages.ModifiablePageResource removed
  org.xwiki.rest.resources.pages.PageChildrenResource: Class org.xwiki.rest.resources.pages.PageChildrenResource removed
  org.xwiki.rest.resources.pages.PageHistoryResource: Class org.xwiki.rest.resources.pages.PageHistoryResource removed
  org.xwiki.rest.resources.pages.PageResource: Class org.xwiki.rest.resources.pages.PageResource removed
  org.xwiki.rest.resources.pages.PageTagsResource: Class org.xwiki.rest.resources.pages.PageTagsResource removed
  org.xwiki.rest.resources.pages.PageTranslationHistoryResource: Class org.xwiki.rest.resources.pages.PageTranslationHistoryResource removed
  org.xwiki.rest.resources.pages.PageTranslationResource: Class org.xwiki.rest.resources.pages.PageTranslationResource removed
  org.xwiki.rest.resources.pages.PageTranslationVersionResource: Class org.xwiki.rest.resources.pages.PageTranslationVersionResource removed
  org.xwiki.rest.resources.pages.PageTranslationsResource: Class org.xwiki.rest.resources.pages.PageTranslationsResource removed
  org.xwiki.rest.resources.pages.PageVersionResource: Class org.xwiki.rest.resources.pages.PageVersionResource removed
  org.xwiki.rest.resources.pages.PagesResource: Class org.xwiki.rest.resources.pages.PagesResource removed
  org.xwiki.rest.resources.spaces.SpaceAttachmentsResource: Class org.xwiki.rest.resources.spaces.SpaceAttachmentsResource removed
  org.xwiki.rest.resources.spaces.SpaceResource: Class org.xwiki.rest.resources.spaces.SpaceResource removed
  org.xwiki.rest.resources.spaces.SpaceSearchResource: Class org.xwiki.rest.resources.spaces.SpaceSearchResource removed
  org.xwiki.rest.resources.spaces.SpacesResource: Class org.xwiki.rest.resources.spaces.SpacesResource removed
  org.xwiki.rest.resources.tags.PagesForTagsResource: Class org.xwiki.rest.resources.tags.PagesForTagsResource removed
  org.xwiki.rest.resources.tags.TagsResource: Class org.xwiki.rest.resources.tags.TagsResource removed
  org.xwiki.rest.resources.wikis.WikiAttachmentsResource: Class org.xwiki.rest.resources.wikis.WikiAttachmentsResource removed
  org.xwiki.rest.resources.wikis.WikiPagesResource: Class org.xwiki.rest.resources.wikis.WikiPagesResource removed
  org.xwiki.rest.resources.wikis.WikiSearchResource: Class org.xwiki.rest.resources.wikis.WikiSearchResource removed
  org.xwiki.rest.resources.wikis.WikisResource: Class org.xwiki.rest.resources.wikis.WikisResource removed

• The version field has been moved from Page to PageSummary which is the superclass of Page
  org.xwiki.rest.model.jaxb.Page: Removed field version

• Added methods for creating workspaces and retrieving workspace templates.
  org.xwiki.workspace.WorkspaceManager: Method 'public com.xpn.xwiki.plugin.wikimanager.doc.XWikiServer createWorkspace(java.lang.String, com.xpn.xwiki.plugin.wikimanager.doc.XWikiServer, java.lang.String)' has been added to an interface
  org.xwiki.workspace.WorkspaceManager: Method 'public java.util.List getWorkspaceTemplates()' has been added to an interface

• The plugin has been moved to its own module. Not a breakage.
  com.xpn.xwiki.plugin.feed.FeedPlugin: Class com.xpn.xwiki.plugin.feed.FeedPlugin removed
  com.xpn.xwiki.plugin.feed.FeedPlugin$EntriesComparator: Class com.xpn.xwiki.plugin.feed.FeedPlugin$EntriesComparator removed
  com.xpn.xwiki.plugin.feed.FeedPlugin$SyndEntryComparator: Class com.xpn.xwiki.plugin.feed.FeedPlugin$SyndEntryComparator removed
  com.xpn.xwiki.plugin.feed.FeedPluginApi: Class com.xpn.xwiki.plugin.feed.FeedPluginApi removed
  com.xpn.xwiki.plugin.feed.SyndEntryDocumentSource: Class com.xpn.xwiki.plugin.feed.SyndEntryDocumentSource removed
  com.xpn.xwiki.plugin.feed.SyndEntryDocumentSource$PropertySelector: Class com.xpn.xwiki.plugin.feed.SyndEntryDocumentSource$PropertySelector removed
  com.xpn.xwiki.plugin.feed.SyndEntrySource: Class com.xpn.xwiki.plugin.feed.SyndEntrySource removed
  com.xpn.xwiki.plugin.feed.SyndEntrySourceApi: Class com.xpn.xwiki.plugin.feed.SyndEntrySourceApi removed
  com.xpn.xwiki.plugin.feed.UpdateThread: Class com.xpn.xwiki.plugin.feed.UpdateThread removed
  com.xpn.xwiki.plugin.feed.XWikiFeedFetcher: Class com.xpn.xwiki.plugin.feed.XWikiFeedFetcher removed
  com.xpn.xwiki.plugin.feed.XWikiFeedFetcher$CredentialSupplier: Class com.xpn.xwiki.plugin.feed.XWikiFeedFetcher$CredentialSupplier removed

• IRCBot is still a young API. Added a new initialize() method to support installing the IRC Bot application in a subwiki
  org.xwiki.ircbot.IRCBot: Method 'public void initialize(java.lang.String)' has been added to an interface

• WikiComponent is still a young API. Moved the class to the internal package
  org.xwiki.component.wiki.MethodOutputHandler: Class org.xwiki.component.wiki.MethodOutputHandler removed
  org.xwiki.component.wiki.WikiComponentInvocationHandler: Class org.xwiki.component.wiki.WikiComponentInvocationHandler removed

• WikiComponent is still a young API. Replaced the getRole() method with getRoleType() to implement XWIKI-8233, "Allow wiki components to implement parameterized types"
  org.xwiki.component.wiki.WikiComponent: Method 'public java.lang.Class getRole()' has been removed
  org.xwiki.component.wiki.WikiComponent: Method 'public java.lang.reflect.Type getRoleType()' has been added to an interface

• WikiComponent is still a young API. Removed some unnecessary methods
  org.xwiki.component.wiki.WikiComponent: Method 'public java.util.Map getHandledMethods()' has been removed
  org.xwiki.component.wiki.WikiComponent: Method 'public java.util.List getImplementedInterfaces()' has been removed

• WikiComponent is still a young API. Added this method to implement XWIKI-8234, "Allow wiki components to be registered at different levels (user / wiki / global)"
  org.xwiki.component.wiki.WikiComponent: Method 'public org.xwiki.model.reference.DocumentReference getAuthorReference()' has been added to an interface
  org.xwiki.component.wiki.WikiComponent: Method 'public org.xwiki.component.wiki.WikiComponentScope getScope()' has been added to an interface

• UIExtension is still a young API. Replaced the List of Block by a Block since Block can now hold a list of Block
  org.xwiki.uiextension.UIExtension: Return type of method 'public java.util.List execute()' has been changed to org.xwiki.rendering.block.Block

• UIExtension is still a young API. getName() has been renamed to getId()
  org.xwiki.uiextension.UIExtension: Method 'public java.lang.String getId()' has been added to an interface
  org.xwiki.uiextension.UIExtension: Method 'public java.lang.String getName()' has been removed

• Added a common method to all elements to set all the data from another element. Technically this does not really break anything because all elements are supposed to extends BaseElement
  com.xpn.xwiki.objects.ElementInterface: Method 'public boolean apply(com.xpn.xwiki.objects.ElementInterface, boolean)' has been added to an interface

• Elemenents must be added to the wrapping NotifyOnList to ensure that the property is marked 'dirty' when updated. To avoid that this mechanism is circumvented, the field is made final.
  com.xpn.xwiki.objects.ListProperty: Field list is now final

• Removed language field because the information is now stored as Locale instead of String and it should have never been protected anyway.
  com.xpn.xwiki.doc.XWikiDocument: Removed field language

• URLPatternMatcher instances cannot generally be reused (because the underlaying Perl5Matcher cannot be reused) on different strings and with different patterns and a new instance must be produced on demand.  It is, thus, meaningless to set an instance. If there is any code relying on this method, it is broken already. Thus, we should remove this without going through deprecation. We might as well remove the getter.
  com.xpn.xwiki.XWiki: Method 'public void setUrlPatternMatcher(org.securityfilter.filter.URLPatternMatcher)' has been removed
  com.xpn.xwiki.XWiki: Method 'public org.securityfilter.filter.URLPatternMatcher getUrlPatternMatcher()' has been removed

• Removed unused field
  com.xpn.xwiki.tool.backup.ImportMojo: Field MPNAME_DESCRIPTION has been removed, but it was previously a constant