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Posted to dev@myfaces.apache.org by "Leonardo Uribe (JIRA)" <de...@myfaces.apache.org> on 2007/11/01 07:31:50 UTC
[jira] Commented: (MYFACES-1741) JSR-252 Issue 21 - Provided an
additional "binding" attribute for the core Converter, Listener and
Validator tags has wrong behaviour
[ https://issues.apache.org/jira/browse/MYFACES-1741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12539290 ]
Leonardo Uribe commented on MYFACES-1741:
-----------------------------------------
After asking some questions on jsf ri dev mailing list, I finally understand the reasons
about why create a delegator for actionListener, converter, validator and valueChangeListener.
The actual behaviour in simple words is this.
when you have a code like this:
<f:actionListener binding="#{mybean}"/>
<f:converter binding="#{mybean}"/>
<f:validator binding="#{mybean}"/>
<f:valueChangeListener binding="#{mybean}"/>
or
<f:actionListener type="#{'anyid'}" binding="#{mybean}"/>
<f:converter converterId="#{'anyid'}" binding="#{mybean}"/>
<f:validator validatorId="#{'anyid'}" binding="#{mybean}"/>
<f:valueChangeListener type="#{'anyid'}" binding="#{mybean}"/>
jsf ri 1.2_05 create a class that acts like a delegator to avoid create an
instance of mybean instead of get the reference of the bean (through a lazy loading).
If you have a component that define the type, converterId or validatorId as a simple
String without EL, the behaviour is like the spec says (what myfaces does right now).
The value of binding variable is irrelevant at each phase. It's just a way to custom
create of components, so it's not necessary to define it previous INVOKE_APPLICATION phase.
With this information, I have created a solution that is equivalent to jsf ri behaviour.
In the patch there are this modifications:
1. Create proper classes that acts as delegate pattern, and implements StateHolder called:
org.apache.myfaces.taglib.core.DelegateActionListener
org.apache.myfaces.taglib.core.DelegateConverter
org.apache.myfaces.taglib.core.DelegateValidator
org.apache.myfaces.taglib.core.DelegateValueChangeListener
2. Create two classes called
org.apache.myfaces.taglib.core.ConvertImplTag
org.apache.myfaces.taglib.core.ValidatorImplTag
There are other children classes from ConverterTag and ValidatorTag that does not
implement this behaviour, so make a modification on it is wrong. It's better to create
classes that implement this specific behaviour to this components.
3. Modify GenericListenerTag, ActionListenerTag and ValueChangeListenerTag to implement
this behaviour.
The issue on javaserverfaces issue tracker (explaining the reason why they do the changes) is #471
There whas a issue that change the behaviour form jsf ri 1.2_04-p02 to 1.2_05 is #631, to remain jsf ri
compatible with trinidad converters:
" ...... If 'converterId' attribute isn't an expression we should return the converter
instead of the BindingConverter. ......"
In a conversation with Ryan Lubke:
".... The change that was introduced was this:
If id is specified and is a literal, then the converter will never
change, so assign the actual
converter instance instead of the binding instance. This was needed
to support certain
functionality provided by trinidad. ..."
"... As it stands in the RI now, we're trying to accomodate what the spec
says (i.e. literal id means actual instance instead of delegate)
and improving upon the spec in how binding *should* have been spec'd out.
Since the Trinidad component set relies on the current spec behavior, I
think this hybrid solution is the best
that we can do until JSF 2.0 clarifies this situation. ..."
> JSR-252 Issue 21 - Provided an additional "binding" attribute for the core Converter, Listener and Validator tags has wrong behaviour
> -------------------------------------------------------------------------------------------------------------------------------------
>
> Key: MYFACES-1741
> URL: https://issues.apache.org/jira/browse/MYFACES-1741
> Project: MyFaces Core
> Issue Type: Bug
> Components: JSR-252
> Affects Versions: 1.2.0
> Environment: Tomcat 6.0.14, Myfaces 1.2.1-SNAPSHOT (Oct 7 2007)
> Reporter: Leonardo Uribe
> Fix For: 1.2.1-SNAPSHOT
>
> Attachments: patchBindingCLVV.patch
>
>
> There is a problem with the behaviour of binding attribute from actionListeners, validators and converters.
> I have this test. The objective is explore how binding attribute is doing things comparing jsf ri 1.2 and
> myfaces 1.2.1-SNAPSHOT, trying to detect bugs on myfaces :)
> bindingCLV.jsp
> <%@ page session="false" contentType="text/html;charset=utf-8"%>
> <%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
> <%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
> <html>
> <f:view beforePhase="#{bindingCLVBean.beforePhase}"
> afterPhase="#{bindingCLVBean.afterPhase}">
> <%@include file="inc/head.inc"%>
> <body>
> <f:loadBundle
> basename="org.apache.myfaces.examples.resource.example_messages"
> var="example_messages" />
> <h1>Myfaces Examples JSF 1.2 Additions</h1>
> <h:messages></h:messages>
> <h:form id="form">
> <h:panelGrid id="grid" columns="3">
> <h:outputLabel value="BigInt" for="bigint"></h:outputLabel>
> <h:inputText id="bigint" binding="#{bindingCLVBean.input1}" value="#{bindingCLVBean.bigint}">
> <f:converter converterId="javax.faces.BigInteger" binding="#{bindingCLVBean.converterBigint}"/>
> <f:validator validatorId="org.apache.myfaces.bindingCLV.DummyValidator"
> binding="#{bindingCLVBean.validatorBigint}"/>
> </h:inputText>
> <h:message for="bigint"></h:message>
> <h:outputLabel value="BigDecimal" for="bigdecimal"></h:outputLabel>
> <h:inputText id="bigdecimal" binding="#{bindingCLVBean.input2}" value="#{bindingCLVBean.bigdecimal}">
> <f:converter converterId="javax.faces.BigDecimal" binding="#{bindingCLVBean.converterBigdecimal}"/>
> <f:validator validatorId="org.apache.myfaces.bindingCLV.DummyValidator"
> binding="#{bindingCLVBean.validatorBigdecimal}"/>
> </h:inputText>
> <h:message for="bigdecimal"></h:message>
> </h:panelGrid>
> <h:commandButton id="button1" value="press me" action="#{bindingCLVBean.update}" >
> <f:actionListener type="org.apache.myfaces.bindingCLV.DummyActionListener"
> binding="#{bindingCLVBean.listener}" />
> </h:commandButton>
> </h:form>
> </body>
> </f:view>
> </html>
> Bean:
> package org.apache.myfaces.bindingCLV;
> import java.math.BigDecimal;
> import java.math.BigInteger;
> import javax.faces.application.FacesMessage;
> import javax.faces.component.html.HtmlInputText;
> import javax.faces.context.FacesContext;
> import javax.faces.convert.Converter;
> import javax.faces.event.ActionListener;
> import javax.faces.event.PhaseEvent;
> import javax.faces.validator.Validator;
> import org.apache.commons.logging.Log;
> import org.apache.commons.logging.LogFactory;
> public class BindingCLVBean {
> private BigInteger bigint;
>
> private BigDecimal bigdecimal;
>
> private Converter converterBigint;
>
> private Converter converterBigdecimal;
>
> private Validator validatorBigint;
>
> private Validator validatorBigdecimal;
>
> private HtmlInputText input1;
>
> private HtmlInputText input2;
>
> private ActionListener listener;
>
> Log log = LogFactory.getLog(BindingCLVBean.class);
>
> public void beforePhase(PhaseEvent phaseEvent){
> FacesContext facesContext = FacesContext.getCurrentInstance();
>
> facesContext.addMessage(null, new FacesMessage("This is the message for phase before "+phaseEvent.getPhaseId().toString()));
> facesContext.addMessage(null, new FacesMessage("Component:"+this.getInput1()));
> facesContext.addMessage(null, new FacesMessage("Validator:"+this.getValidatorBigdecimal()));
> facesContext.addMessage(null, new FacesMessage("Converter:"+this.getConverterBigdecimal()));
> facesContext.addMessage(null, new FacesMessage("ActionListener:"+this.getListener()));
> log.info("This is the message for phase before "+phaseEvent.getPhaseId().toString()+" : ");
> }
>
> public void afterPhase(PhaseEvent phaseEvent){
> FacesContext facesContext = FacesContext.getCurrentInstance();
>
> facesContext.addMessage(null, new FacesMessage("This is the message for phase after "+phaseEvent.getPhaseId().toString()));
> facesContext.addMessage(null, new FacesMessage("Component:"+this.getInput1()));
> facesContext.addMessage(null, new FacesMessage("Validator:"+this.getValidatorBigdecimal()));
> facesContext.addMessage(null, new FacesMessage("Converter:"+this.getConverterBigdecimal()));
> facesContext.addMessage(null, new FacesMessage("ActionListener:"+this.getListener()));
> log.info("This is the message for phase after "+phaseEvent.getPhaseId().toString()+" : ");
> }
>
> public BigInteger getBigint() {
> return bigint;
> }
> public void setBigint(BigInteger bigint) {
> this.bigint = bigint;
> }
> public BigDecimal getBigdecimal() {
> return bigdecimal;
> }
> public void setBigdecimal(BigDecimal bigdecimal) {
> this.bigdecimal = bigdecimal;
> }
> public Converter getConverterBigint() {
> return converterBigint;
> }
> public void setConverterBigint(Converter converterBigint) {
> this.converterBigint = converterBigint;
> }
> public Converter getConverterBigdecimal() {
> return converterBigdecimal;
> }
> public void setConverterBigdecimal(Converter converterBigdecimal) {
> this.converterBigdecimal = converterBigdecimal;
> }
> public Validator getValidatorBigint() {
> return validatorBigint;
> }
> public void setValidatorBigint(Validator validatorBigint) {
> this.validatorBigint = validatorBigint;
> }
> public Validator getValidatorBigdecimal() {
> return validatorBigdecimal;
> }
> public void setValidatorBigdecimal(Validator validatorBigdecimal) {
> this.validatorBigdecimal = validatorBigdecimal;
> }
>
> public String update(){
> FacesContext context = FacesContext.getCurrentInstance();
> return "update";
> }
> public HtmlInputText getInput1() {
> return input1;
> }
> public void setInput1(HtmlInputText input1) {
> this.input1 = input1;
> }
> public HtmlInputText getInput2() {
> return input2;
> }
> public void setInput2(HtmlInputText input2) {
> this.input2 = input2;
> }
> public ActionListener getListener() {
> return listener;
> }
> public void setListener(ActionListener listener) {
> this.listener = listener;
> }
> }
> When you call the page the first time, this is the output for <h:messages> tag :
> JSF RI:
> * This is the message for phase before RENDER_RESPONSE 6
> * Component:javax.faces.component.html.HtmlInputText@164de59
> * Validator:null
> * Converter:null
> * ActionListener:null
> Myfaces:
> * This is the message for phase before RENDER_RESPONSE(6)
> * Component:javax.faces.component.html.HtmlInputText@18c5e67
> * Validator:org.apache.myfaces.bindingCLV.DummyValidator@89c116
> * Converter:javax.faces.convert.BigDecimalConverter@1e3bbd7
> * ActionListener:org.apache.myfaces.bindingCLV.DummyActionListener@4133b0
> QUESTION 1: Why do I create an object that I do not use?. Myfaces is wrong, and JSF RI has the correct behaviour.
> The first time that I load a page, it's unnecesary to create those objects.
> And when you press the button or submit the form:
> JSF RI:
> * This is the message for phase before APPLY_REQUEST_VALUES 2
> * Component:javax.faces.component.html.HtmlInputText@14aa2db
> * Validator:null
> * Converter:null
> * ActionListener:null
> * This is the message for phase after APPLY_REQUEST_VALUES 2
> * Component:javax.faces.component.html.HtmlInputText@14aa2db
> * Validator:null
> * Converter:null
> * ActionListener:null
> * This is the message for phase before PROCESS_VALIDATIONS 3
> * Component:javax.faces.component.html.HtmlInputText@14aa2db
> * Validator:null
> * Converter:null
> * ActionListener:null
> * This is the message for phase after PROCESS_VALIDATIONS 3
> * Component:javax.faces.component.html.HtmlInputText@14aa2db
> * Validator:org.apache.myfaces.bindingCLV.DummyValidator@10df4e2
> * Converter:javax.faces.convert.BigDecimalConverter@1485542
> * ActionListener:null
> * This is the message for phase before UPDATE_MODEL_VALUES 4
> * Component:javax.faces.component.html.HtmlInputText@14aa2db
> * Validator:org.apache.myfaces.bindingCLV.DummyValidator@10df4e2
> * Converter:javax.faces.convert.BigDecimalConverter@1485542
> * ActionListener:null
> * This is the message for phase after UPDATE_MODEL_VALUES 4
> * Component:javax.faces.component.html.HtmlInputText@14aa2db
> * Validator:org.apache.myfaces.bindingCLV.DummyValidator@10df4e2
> * Converter:javax.faces.convert.BigDecimalConverter@1485542
> * ActionListener:null
> * This is the message for phase before INVOKE_APPLICATION 5
> * Component:javax.faces.component.html.HtmlInputText@14aa2db
> * Validator:org.apache.myfaces.bindingCLV.DummyValidator@10df4e2
> * Converter:javax.faces.convert.BigDecimalConverter@1485542
> * ActionListener:null
> * This is the message for phase after INVOKE_APPLICATION 5
> * Component:javax.faces.component.html.HtmlInputText@14aa2db
> * Validator:org.apache.myfaces.bindingCLV.DummyValidator@10df4e2
> * Converter:javax.faces.convert.BigDecimalConverter@1485542
> * ActionListener:org.apache.myfaces.bindingCLV.DummyActionListener@391da0
> * This is the message for phase before RENDER_RESPONSE 6
> * Component:javax.faces.component.html.HtmlInputText@14aa2db
> * Validator:org.apache.myfaces.bindingCLV.DummyValidator@10df4e2
> * Converter:javax.faces.convert.BigDecimalConverter@1485542
> * ActionListener:org.apache.myfaces.bindingCLV.DummyActionListener@391da0
> Myfaces:
> * This is the message for phase before APPLY_REQUEST_VALUES(2)
> * Component:javax.faces.component.html.HtmlInputText@16752c9
> * Validator:null
> * Converter:null
> * ActionListener:null
> * This is the message for phase after APPLY_REQUEST_VALUES(2)
> * Component:javax.faces.component.html.HtmlInputText@16752c9
> * Validator:null
> * Converter:null
> * ActionListener:null
> * This is the message for phase before PROCESS_VALIDATIONS(3)
> * Component:javax.faces.component.html.HtmlInputText@16752c9
> * Validator:null
> * Converter:null
> * ActionListener:null
> * This is the message for phase after PROCESS_VALIDATIONS(3)
> * Component:javax.faces.component.html.HtmlInputText@16752c9
> * Validator:null
> * Converter:null
> * ActionListener:null
> * This is the message for phase before UPDATE_MODEL_VALUES(4)
> * Component:javax.faces.component.html.HtmlInputText@16752c9
> * Validator:null
> * Converter:null
> * ActionListener:null
> * This is the message for phase after UPDATE_MODEL_VALUES(4)
> * Component:javax.faces.component.html.HtmlInputText@16752c9
> * Validator:null
> * Converter:null
> * ActionListener:null
> * This is the message for phase before INVOKE_APPLICATION(5)
> * Component:javax.faces.component.html.HtmlInputText@16752c9
> * Validator:null
> * Converter:null
> * ActionListener:null
> * This is the message for phase after INVOKE_APPLICATION(5)
> * Component:javax.faces.component.html.HtmlInputText@16752c9
> * Validator:null
> * Converter:null
> * ActionListener:null
> * This is the message for phase before RENDER_RESPONSE(6)
> * Component:javax.faces.component.html.HtmlInputText@16752c9
> * Validator:org.apache.myfaces.bindingCLV.DummyValidator@1c958af
> * Converter:javax.faces.convert.BigDecimalConverter@1dd7736
> * ActionListener:org.apache.myfaces.bindingCLV.DummyActionListener@bd93cd
> QUESTION 2: Why I not have bindings assigned before INVOKE_APPLICATION ?(in this time is of value have a binding attribute) .
> Again JSF RI has the correct behaviour and Myfaces is wrong. Myfaces create the validators, converters and
> actionListeners on correct time, but not assign bindings when is supposed to do. If I assign a binding for
> converter, validator or actionListener, I should be assigned minimum before INVOKE_APPLICATION, or better,
> converters and validators on PROCESS_VALIDATIONS, and actionListeners in INVOKE_APPLICATION.
> Looks a little bit difficult but I will try to find a solution for this issue.
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