JSF How to spell check on JSF (facelets and bean)

Work in progress...If you have any comment to extend/optimize it please post!

The goal

I want to spell check all *.xhtml and *.java in my JSF application

The solution (incomplete)

find . -name *.xhtml -exec aspell --mode=html -c {} \;

Criticism: EL exressions (e.g. #{fooBean.foo()}) are not skipped by the speller.

JSF: Changes made to submitted value by the Managed Bean are not rendered after ajax call and using immediate="true"

The goal and problem

In a facet form I have a value. When I click the commandButton it calls an action on the Managed Bean which changes the submitted value. The updated value should be rendered on the view...but it doesn't! Note that I use immediate="true" to skip the validation phase (because validation error may be shown).
[Actually what I want to do is render some numerical values and randomize them each time I click the commandButton] Managed Bean Foo.java:

public void submit() {
   this.val = 3; //the new value
}

Facelet:

<h:form>
<p:inputText value="#{fooBean.val}"></p:inputText>

<p:commandButton value="Submit"
  action="#{fooBean.submit()}" 
  update="@form"
  immediate="true" />
</h:form>

The solution

Skipping validation doesn't mean that the input value is not submitted!! In the Managed Bean I change the value foobean.val and indeed changes but the component p:inputText preserves the old value because its attribute submittedValue is the old one. The solution is to use the attribute process="@this" because this way we don't submit the value!. The correct Facelet is the following:

<h:form>
<p:inputText value="#{fooBean.val}"></p:inputText>

<p:commandButton value="Submit"
  action="#{fooBean.submit()}" 
  update="@form"
  immediate="true"
  process="@this" />
</h:form>

JSF: How to bind a Double to and format it (or: How to tackle "java.lang.Long cannot be cast to java.lang.Double")

The problem:If the inputText is bound to a Double and an integer value is given (e.g. 100) then a java.lang.Long cannot be cast to java.lang.Double exception is thrown.

The solution (hint):The solution is at the end of the post..

Goal 1: Bind the Double attribute value of the ManagedBean fooBean into a inputText

<p:inputText value="#{fooBean.value}" />

OK the above works fine.

Goal 2: Add formatting

<p:inputText value="#{fooBean.value}">
  <f:convertNumber maxFractionDigits="2" type="number"/>
</p:inputText>

But...if I give as input a number without a decimal part (e.g. 100) a coversion exceptions is thrown: java.lang.Long cannot be cast to java.lang.Double. The reason for this exception is described in stack overflow Phill's post:

After some investigation (see e.g. here, here and here) that <f:convertNumber> is the problem. It seems that the number it converts to is dependent on the input you give it - it could be an integer or a floating point number. In other words, it doesn't look at the target type - it just generates an instance of java.lang.Number. Which is hardly ideal, although I can't determine whether this is because somewhere I'm using an old version of JSF or EL or something like that. Proposals from the internet:

• Add converterId="javax.faces.Double" into ...But: accepts and validates doubles but formatting doesn't work! (see )

Solution

In a few words..Formating works only if the value is bound to a BigDecimal! Double doesn't work :(

<p:inputText value="#{fooBean.value}" style="width:50px">
  <f:validateDoubleRange />
  <f:convertNumber maxFractionDigits="2" type="number"/>
</p:inputText>

References of people tackling the same problem

• Format a double for non-fractional numbers in JSF
• jsf h:inputText and Double value

JSF: How to access from a Facelet an enum declared in the Managed Bean

Enum (TYPE.java):

public enum TYPE {
 TYPE_A,
 TYPE_B;

 //...
}

Managed Bean (FooBean.java):

public void init(TYPE type) {
  //...
}

Facelet:

<f:metadata>
   <f:event type="preRenderView" listener="#{fooBean.init('TYPE_A')}"/>
</f:metadata>

References

http://stackoverflow.com/questions/3916871/passing-a-enum-value-as-a-parameter-from-jsf

JPA:Facelets: How to create a locale variable in a facelet

<!-- setting value1 into foo1 -->
<ui:param name="foo1" value="#{'value1'}"/>
<!-- calling a managed bean method myMethod() an setting the result into foo2 -->
<ui:param name="foo2" value="#{mybean.myMethod()}"/>

Note 1

<c:set /> and #{pageScope.set()} hasn't worked for me (see http://www.warski.org/blog/2008/04/value-to-variable-binding-let-tag-for-jsf-facelets-and-seam/).

Note 2

A <c:set /> variable has page scope meaning that I cannot be sent to a managed bean (e.g. as a method argument).

JSF: outputText doesn't not localize a Double-value

I want to localize the Double attribute value of the managed bean fooBean in Greek; i.e. number 12.3 should be 12,3 in greek locale (locale=el) and 12.3 in english locale (locale=en) Wrong code:

 <h:outputText value="#{fooBean.value}" />

Right code:

 <h:outputText value="#{fooBean.value">
    <f:convertNumber type="number" />
</h:outputText>

JSF:Composite Components: How to update a form which contains a composite component from the cc

Goal: The facelet outer.xhtml contains the composite component resources/components/foocomp.xhtml. I want when I click the button in the foocomp.xhtml to update the form in order I see any errors/messages in <messages>

Attempt 1: using @form (not working)

Facelet outer.xhtml:

xmlns:comps="http://java.sun.com/jsf/composite/components">

<h:form>
   <!-- PrimeFaces messages component; equivalent to <h:messages> -->
   <p:messages showDetail="false" globalOnly="true"></p:messages>
   <comps:foocomp></comps:foocomp>
  
</h:form>

<p:commandButton action="#{fooBean.myAction()}" 
   update="@form"></p:commandButton>

Output:

javax.faces.FacesException: Cannot find component with identifier "'id_j3'" in view.

* Note: the id id_j3 is the random id given to the form as I found out.

Attempt 2: giving the form an id (not working)

Facelet outer.xhtml:

xmlns:comps="http://java.sun.com/jsf/composite/components">

<h:form id="outerForm" prependId="false">
   <!-- PrimeFaces messages component; equivalent to <h:messages> -->
   <p:messages showDetail="false" globalOnly="true"></p:messages>
   <comps:foocomp formId="outerForm"></comps:foocomp>
  
</h:form>

<composite:interface>
  <!-- the enclosed form id which will updated after an action is triggered -->
  <composite:attribute name="formId" type="java.lang.String" required="true" />
</composite:interface>

<p:commandButton action="#{fooBean.myAction()}" 
   update="#{cc.attrs.formId}">
</p:commandButton>

Output:

javax.faces.FacesException: Cannot find component with identifier "'outerForm'" in view.

Attempt 3: giving the form an id and referencing it with ':' (working!)

Facelet outer.xhtml:

xmlns:comps="http://java.sun.com/jsf/composite/components">

<h:form id="outerForm" prependId="false">
   <!-- PrimeFaces messages component; equivalent to <h:messages> -->
   <p:messages showDetail="false" globalOnly="true"></p:messages>
   <comps:foocomp formId="outerForm"></comps:foocomp>
  
</h:form>

<composite:interface>
  <!-- the enclosed form id which will updated after an action is triggered -->
  <composite:attribute name="formId" type="java.lang.String" required="true" />
</composite:interface>

<p:commandButton action="#{fooBean.myAction()}" 
   update=":#{cc.attrs.formId}"></p:commandButton>

Primefaces <p:button> java.lang.NullPointerException

Exception

java.lang.NullPointerException
 at org.primefaces.component.button.ButtonRenderer.buildOnclick(ButtonRenderer.java:128)
 at org.primefaces.component.button.ButtonRenderer.encodeMarkup(ButtonRenderer.java:59)

Solution:<p:button> points to an invalid link..

JSF: <p:selectOneRadio> gives "Value is not valid"

Facelet:

<p:selectOneRadio
   value="#{fooBean.val}"
   converter="valConverter">
 <f:selectItems value="#{fooBean.refValues}" var="v" itemLabel="#{v.label}" itemValue="#{v}" />
</p:selectOneRadio>

Solution

Make sure that:

• Make sure that val has properly implemented hashCode() and equals() (see StackOverflow)

JSF does not support class-level validation!

still open..see https://hibernate.onjira.com/browse/BVAL-214

For a description+example of JSR 303 class-level validation see the following link (the comments)

JSF: How to get the current web page address

String currentPage = FacesContext.getCurrentInstance().getViewRoot().getViewId();

JSF:Facelet:Composite Component:Troubleshooting: Cannot find component with id blah

Wrong 1:

<composite:implementation>
 <p:inputText id="input" />
 <p:message for="#{cc.clientId}:input" />

Wrong 2:

<composite:implementation>
 <p:inputText id="input" />
 <p:message for="#{cc.component}:input" />

Right:

<composite:implementation>
 <p:inputText id="input" />
 <p:message for="input" />

JSF:Facelet: How to use <f:metadata> with a template

view01.xhtml

    <ui:composition template="template.xhtml">
        <ui:define name="metadata">
          <f:metadata>
            <f:viewParam name="id"/>
          </f:metadata>
        </ui:define>
        <ui:define name="content">
            <h1>The big news stories of the day</h1>
        </ui:define>
    </ui:composition> 

template.xhtml

    <html xmlns="http://www.w3.org/1999/xhtml"
          xmlns:ui="http://java.sun.com/jsf/facelets"
          xmlns:f="http://java.sun.com/jsf/core"
          xml:lang="en" lang="en">
     
    <body>
    <f:view>
       
            <ui:insert name="metadata"/>
       
        <div id="container">
            <ui:insert name="content"/>
        </div>
    </f:view>
    </body>
    </html> 

References

• Facelets API
• StackOverflow

JSF:Facelets: How to format output as Double with 2 decimal digits

<h:outputText value="#{fooBean.value}">
  <f:convertNumber maxFractionDigits="2" groupingUsed="false" />
</h:outputText>

JSF:Facelets: How to format output as Integer

<h:outputText value="#{fooBean.value}">
  <f:convertNumber maxFractionDigits="0" groupingUsed="false" />
</h:outputText>

Spring Security+JSF:Facelet: access username

#{SPRING_SECURITY_CONTEXT.authentication.principal.username}

JSF: dynamic ids generation in <ui:repeat>

Wrong:

Right:

PrimeFaces p:button vs HTML button (or: why does p:button re-GETs the page?)

// NOT GET; NOT POST
<button onclick="foo()">My button</button>

function updateAllCells() {
 ...
 //returns nothing
}

//CAUSES GET; page is redisplayed
<p:button onclick="foo();" value="My button" />

// NOT GET; NOT POST
<p:button onclick="foo();return false;" value="My button" />

PrimeFaces error: "java.lang.IllegalArgumentException: Setter not found for property class"

Actually my problem was the same as on http://duckranger.com/2010/05/facelets-setter-not-found-for-property-class/. I.e. I used class instead of styleClass!

JSF+PrimeFaces: how to download Excel (with actionListener)

public void exportExcelActionListener(ActionEvent event) {
  try {
    String filename = "myexceltodownload.xls";
         
    FacesContext facesContext = FacesContext.getCurrentInstance();
    ExternalContext externalContext = facesContext.getExternalContext();
    externalContext.setResponseContentType("application/vnd.ms-excel");
      
    // http://stackoverflow.com/questions/3592058/how-to-send-byte-as-pdf-to-browser-in-java-web-application
    // attachment (pops up a "Save As" dialogue) or inline (let the web browser handle the display itself)
    externalContext.setResponseHeader("Content-Disposition", "attachment; filename=\""+filename+"\"");
 
    getWorkbook().write(externalContext.getResponseOutputStream()); //get workbook
    facesContext.responseComplete(); //if I don't call responseComplete() => IllegalStateException
      
    return null; //remain on same page
  } catch(Exception e) {
    // handle exception...
    return null; //remain on same page
   }
}

Note: To experiment with the download commandbutton of primefaces...
Note: Strangely didn't work for me....