A Complete Tour of JSF 2
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Transcript of A Complete Tour of JSF 2
A Complete Tour of
JavaServer Faces 2.0
Jim [email protected] [email protected]
Heading should be V3 Express?Change the dates and names
What's new?
Almost Everything
Faces Expert Group
Sun Ed Burns, Roger Kitain (Spec leads)
Oracle
Apache
IceFaces
RichFaces
RedHat / Seam
Book Authors
Many more
All of the Faces of Faces at Sun
R
Ed Burns
Jim Driscoll
Roger Kitain
Ryan Lubke
Most of the Faces of the EG
Andy Schwartz
Dan Allen
Alexandr Smirnov
Ken Paulsen
Martin Marinschek
Pete Muir
Kito Mann
Joe Ottinger
Ted Goddard
Neil Griffin
Jason Lee
David Geary
Mike Freedman
Gavin King
R
Jeremy Grelle
Keith Donald
Ed Burns
Jim Driscoll
Roger Kitain
Ryan Lubke
Some Faces of the Faces Community
Andy Schwartz
Dan Allen
Jacob Hookom
Alexandr Smirnov
Ken Paulsen
Martin Marinschek
Matthias Weendorf
Pete Muir
Alexander Jesse
Imre Owald
Yara Senger
Lincoln Baxter III
Adam Winer
Craig McClanahan
Kito Mann
Rick Hightower
Joe Ottinger
Ted Goddard
Neil Griffin
Jason Lee
Stan Silvert
David Geary
Mike Freedman
Gavin King
Hazem Saleh
aatay ivici
Dennis Byrne
Roger Keays
Amy Fowler
Max Katz
R
Jeremy Grelle
Keith Donald
Community Ideas
Innovation happens everywhere
Most ideas were proven in the community before adoption
Some approaches (i.e., Ajax) required a good deal of merging
Highlights on each feature
Features, features
Facelets
Facelets
Almost exactly the same as existing Facelets technology
JSP still supported, but...All new features will be in Facelets
Facelets now the preferred View Declaration Language
Designed for JSF from the beginning
Facelets
XHTML based document validation
Better error handling, including line numbers
Library prefixes as namespaces
EL directly in page:#{bean.propertyname}
Templating made easyui:composition, ui:define, ui:insert
ui:include, ui:repeat
Composite Components
This...
Becomes this...
Or maybe this:
Composite Components
Enable True AbstractionCreate a true, reusable, component from an arbitrary region of a page
Built by composing other components
Full support for using attached objects in the using page, and mapping them to arbitrary targets within the composite componentAction methods
Validators, etc
Composite Components
Builds on top of Resources and Facelets
Heavily leverages naming conventionsResource dir
Library name is directory name
Tag name is file name
Essentially special-case templating
Composite Component
In file ctx-root/resources/simpleout/out.xhtml:
Composite Component
.... ....
Ajax
Ajax
Inspiration: ADF Faces, RichFaces, IceFaces, DynamicFaces
Two entry points:Declarative: tag, uses AjaxBehavior
Programmatic ajax: resource library javax.faces, resource name jsf.js, JavaScript namespace jsf.ajax. jsf.ajax.request function
Ajax
Declarative ajax: useful to ajaxify non ajax pagesAdd ajax behaviors invisibly
Supports many Ajax usecases
JavaScript Ajax API usage patternjsf.ajax.request() JavaScript function
Integrate with existing Ajax widgets
Simplify lifecycle view: execute and render
Ajax Tag Example
Partial State Saving
Partial State Saving
Inspired by Trinidad state saving
Save only the state that's changed since creation of the component tree
Per-view state size up to 4X smaller than before
Default for pages written with Facelets
Of interest to Java custom component authors
All standard components implement this feature - your composite components will automatically take advantage of it.
Partial State Saving
PartialStateHolder behavioral interface, extends existing StateHolder.PartialStateHolder.markInitialState()
StateHelper, from UIComponent, does most of the work: replace ivars with keys within StateHelperNo longer need custom saveState/restoreState() implementations
Simplify Custom Components
public class MyInput extends UIComponentBase { private enum Keys { name }
public String getName() { return getStateHelper().get(name); }
public void setName(String nameParam) { getStateHelper().put(name, nameParam); }}
View Parameters
View Parameters
Inspired by Page Parameters from JBoss Seam
Provides a way to map request parameters to special components within the view
View Parameters
page1.xhtml?foo=bar
bean.foo will equal bar
View Parameters
UIViewParameter extends UIInput
All attached objects valid for UIInput are valid validation and conversion
Breaks the tyranny of POST
Lays the foundation for Bookmarkable pages
System Events
System Events
Influenced by JSFTemplatingInspired by Solaris Dtrace, Linux strace, etc.
Publish/Subscribe event bus for things that happen during the JSF Lifecycle
Adds to event listening abilities:FacesEvent/FacesListener
PhaseEvent/PhaseListener
SystemEvent/SystemEventListener
System Event Types
System Events
Listeners can be registered at three scopescomponent UIComponent.subscribeToEvent()
view UIViewRoot.subscribeToEvent()
application Application.subscribeToEvent()
Publish is always Application.publishEvent()
Declarative System Events
Resources
Resources
Avoid need for separate Filter or Servlet.
Resources are logically related to components, treat them that way.
Load from Classpath, or filesystem
Full support for Library concept, I18N, Versioning
Resources Java API
@ResourceDependency or @ResourceDependencies annotation onUIComponent, Renderer, Validator, Converter, ClientBehavior
attributes for resource name, library name
attribute for target: head, body, form
Built in support for CSS, Image, JavaScript resources
test
Resources Markup API
, Used for resource relocation targets
, Attributes for resource name, library name
Attribute for target: head, body, form
Smart includes, useful for composite components
Resource EL
#{resource['']}
#{resource[':']}
Examples of use
Behaviors
Behaviors
A Behavior is an interface and invents a new type of attached object which takes part in decode/encode.
ClientBehavior extends Behavior
Define things that happen in the view, in the browser
Currently only one standard ClientBehavior implementation: AjaxBehavior
New interface: ClientBehaviorHolder, implemented by all components in javax.faces.component.html
Special ClientBehaviorRenderer, does not extend Renderer. getScript(), decode()
View Traversal
View Traversal
1.2: UIComponent.invokeOnComponent() Single component in context
VisitContext.createVisitContext()
UIComponent.visitTree(VisitContext)Multiple components in context
Used on Ajax requests for partial traversal
Used by new StateManagementStrategy
More features
Annotations
Navigation
Exceptions
Validation
EL
Scopes
Project Stage
Annotations
@ManagedBean
@*Scoped (Session, Request, etc)
@ManagedProperty
@FacesComponent
@FacesConverter
etc.
With implicit Navigation, may eliminate need for faces-config.xml in many cases
Navigation
Bookmarkable PagesUses View Parameters to ensure request params are validated before rendering page
New components , , cause the browser to submit GET request, contrast with
add GET params
Inverse mapping of view params
Navigation
Implicit NavigationIf you dont want all that stuff, you can put the navigation logic straight in the page.
Conditional Navigation if statements
ConfigurableNavigationHandlerQuery navigation rules at run-time
Exceptions
ExceptionHandlercan be decorated
all interesting exceptions flow through the exception handler!
new exception type: UpdateModelException
ValidatorException contains multiple FacesMessages
EL
#{component}, #{cc} (composite component): get the currently processed component / composite component
#{component.clientId}
#{component.messageList}
EL
Make ActionEvent param optional for action-listeners
For EE6, EL method invocation supports parametersmakes f:setPropertyActionListener obsolete
Validation
Integration with JSR 303: Bean Validation@NotEmpty private String name;
default validator: javax.faces.Bean automatically applied to all input fields
Default-validator: hook up a validator for all instances of EditableValueHolder
preValidate/postValidate system events
New Validation Tags
Beans validation tag
Required field
Regular expression validation
New Scopes
conversation comes from Java Contexts and Dependency Injection (JSR 299) nee Weld
Flash: inspired by Ruby on Rails accessible from EL or ExternalContext
useful for storing data for use on the next request
preserves FacesContext-messages across redirects
New Scopes
View: persists as long as user interacts with the same viewmanaged-beans can be put in view-scope
Custom Scopes
Project Stage
Inspired by Rails
DevelopmentBetter error reporting, debugging
ProductionBetter performance
Using JSF 2.0 Now
Project MojarraFCS in a few weeks
https://javaserverfaces.dev.java.net/
Color coded JavaDocs
http://javaserverfaces.dev.java.net/docs/2.0/
New in 2.0
Changed in 2.0
Deprecated in 2.0 (JSP)
M
Blogs for more detail
http://andyschwartz.wordpress.com/2009/07/31/whats-new-in-jsf-2/
http://www.java.net/blogs/driscoll/
http://blogs.sun.com/rlubke/
http://www.java.net/blogs/edburns/
http://www.java.net/blogs/rogerk/
Further Reading
http://javaserverfaces.dev.java.net/docs/2.0
David Geary's writeup:http://www.ibm.com/developerworks/java/library/j-jsf2fu1/index.html
Java EE Tutorial (out soon)
Several additional books will be out this year
A Complete Tour of
JavaServer Faces 2.0
Jim [email protected] [email protected]
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10/14/09
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