Author
ZK Team, Potix Corporation

Date
November 15, 2011

Version
ZK 6

Overview

In additions to new features, ZK 6 also cleans up some API that are confusing, redundant or over complicated. The effort to upgrade depends on what features your application uses. Many of them shall run without modification. It is suggested to re-compile the applications and replace the code that use the deprecated API.

Upgrade addons

Here is a list of addons that you have to upgrade:

ZK JSP 2.0 or later. Download here.
ZK Calendar 2.1.1 or later. Download here.

API that are changed

org.zkoss.zk.zul.api.* are removed

The component's API interfaces (org.zkoss.zk.ui.api.*, org.zkoss.zul.api.*...) are removed^[1] Please replace them with the concrete classes. For example, use org.zkoss.zul.Window instead of org.zkoss.zul.api.Window.

Template:References

org.zkoss.zk.ui.util.Initiator is simplified

The org.zkoss.zk.ui.util.Initiator class now has only one method called doInit. The doAfterComposer, doCatch and doFinally methods are moved to org.zkoss.zk.ui.util.InitiatorExt. In other words, if you'd like to override any of these methods, your initiator has to implement both org.zkoss.zk.ui.util.Initiator and org.zkoss.zk.ui.util.InitiatorExt.

org.zkoss.xel.FunctionMapper is simplified

The getClassNames and resolveClass methods of the org.zkoss.xel.FunctionMapper class are removed. On the other hand, org.zkoss.xel.FunctionMapperExt was introduced to have these methods. In other words, you'd like to implement any of these methods, you have to implement both FunctionMapper and FunctionMapperExt.

API returns Iterable instead Iterator

To use with Java 5's for statement, the return type of the following APIs are changed to java.lang.Iterable:

org.zkoss.zk.ui.Exectuion: getHeaders and getHeaderNames
org.zkoss.zk.ui.WebApp: getInitParameterNames
org.zkoss.zk.ui.RichletConfig: getInitParameterNames

Window, Messagebox and Fileupload won't throw InterruptedException

Window, Messagebox and Fileupload won't throw java.lang.InterruptedException anymore, since it won't happen if the event processing thread is disabled (default). If the event processing thread is enabled, InterruptedException will be wrapped with UiException.

addEventListener allows the same listener registered multiple times

Component's addEventListener now allows the same listener being registered multiple times, and the listener will be called multiple times.

If you prefer to ignore the second registration of the same listener (i.e., backward compatible with ZK 5 and earlier), you could specify a library property called org.zkoss.zk.ui.EventListener.duplicateIgnored to true in WEB-INF/zk.xml.

UiFactory's newComponent is changed

The newComponent method of the org.zkoss.zk.ui.sys.UiFactory is changed. In additions, two new methods newComposer and newServerPush were introduced to allow developers have more control of the instantiations.

GenericForwardComposer and GenericAutowireComposer won't wire variables defined in zscript and variable resolvers

For sake of better performance, org.zkoss.zk.ui.util.GenericForwardComposer and org.zkoss.zk.ui.util.GenericAutowireComposer won't wire variables defined in zscript and variable resolvers. If you prefer to write them as ZK 5 and earlier does, you could specify the library properties called org.zkoss.zk.ui.composer.autowire.zscript and org.zkoss.zk.ui.composer.autowire.xel to true.

Component's newChildren and newExtraCtrl are removed

The newChildren and newExtraCtrl methods of AbstractComponent are removed. Please override the getChildren and getExtraCtrl instead.

Component's setVariable is removed

Component's setVariable method is removed. Please use Component.setAttribute(name, value, SPACE_SCOPE) instead. In other words, you could store the variables in the attributes of the space owner (Component.getSpaceOwner()).

ListX, TreeArray and CheckableTreeArray are removed

The org.zkoss.util.ListX, org.zkoss.util.TreeArray and org.zkoss.util.CheckableTreeArray are removed. Please use java.util.LinkedList or java.util.ArrayList instead.

API that are deprecated

org.zkoss.zul.SimpleTreeModel and org.zkoss.zul.SimpleTreeNode are deprecated

The org.zkoss.zul.SimpleTreeModel and org.zkoss.zul.SimpleTreeNode classes are deprecated and replaced with org.zkoss.zul.DefaultTreeModel and org.zkoss.zul.DefaultTreeNode.

Notice the previous classes are still available but deprecated (not found in JavaDoc).

org.zkoss.zk.ui.event.Expression is deprecated

The org.zkoss.zk.ui.event.Expression interface is deprecated. Please use the addEventListener(int, String, EventListener) method instead, and assign the priority as 1000.

HTMLs, StyleSheet and JavaScript are moved

The HTMLs, StyleSheet and JavaScript classes are moved to the package called org.zkoss.html.