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binding xhtml and bean not working and the problem is : javax.el.PropertyNotFoundException

Greenhorn

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posted 10 years ago

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I am working on eclipse kepler, JSF 2.2 with PrimeFaces 4.0 / Mojarra 2.2 library.

actually there are 2 Problems:

-

I still get this server message no matter what I do.

(( javax.el.PropertyNotFoundException: /Order.xhtml @28,76 value="#{kk.refugee.id}": Target Unreachable, 'refugee' returned null))
and if I delete the input text puls the hidden, the message keeps pop up for 'material' selectOneMenu.

-

I have no chance to examin : ((is this javascript code correct, to copy the value of one component to the other.))

these are my xhtml file and java calsses.
thank you in advanced.

**kk.java**
-----------

RefugeeMan.java
---------------

Order.xhtml
-----------

<?xml version='1.0' encoding='UTF-8' ?>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml"
    	xmlns:ui="http://java.sun.com/jsf/facelets"
    	xmlns:h="http://java.sun.com/jsf/html"
    	xmlns:f="http://java.sun.com/jsf/core"
    	xmlns:p="http://primefaces.org/ui">
    
    <h:head>
    	<title>Facelet Title</title>
    
    	<script type="text/javascript">
    		function setHiddenValue() {
    
    			document.getElementById('hidKBCardNo').value = document
    					.getElementById('KBCardNo').value;
    			return true;
    		}
    	</script>
    </h:head>
    <h:body>
    	<h:form id="frmAids" prependId="false">
    
    		<p:panel id="display" header="Sale Item" style="width: 450px;">
    			<p:panelGrid id="pgrid" columns="2">
    				<h:outputText id="outxtID" value="ID" />
    
    				<p:keyboard id="KBCardNo" value="#{kk.refugee.id}" keypadOnly="true" />
    
    				<h:outputText for="hidKBCardNo" />
    				<h:inputHidden id="hidKBCardNo" value="#{kk.refugee.id2}" />
    
    				<h:outputText value="material" />
    				<p:selectOneMenu value="#{kk.refugee.material}">
    					<f:selectItem itemLabel="choose one:" itemValue="" />
    					<f:selectItem itemLabel="Option1" itemValue="Option1" />
    					<f:selectItem itemLabel="Option2" itemValue="Option2" />
    					<f:selectItem itemLabel="Option3" itemValue="Option3" />
    				</p:selectOneMenu>
    
    				<p:commandButton value="Submit" onclick="setHiddenValue();"
    					action="#{kk.AidsSpecialInsert}" />
    
    			</p:panelGrid>

</p:panel>

</h:form>
    
    </h:body>
    
    </html>

Tim Holloway

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posted 10 years ago

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I see 2 problems.

1. The JavaBean standard requires that Class names start with an upper-case character, but member (property) and instance names (JSF backing bean names, for instance) start with a lower-case letter.

You named your backing bean class "kk", when "Kk" would have been more appropriate. Since you didn't explictly provide an annotation to name the instance created, the standard mechanism would have attempted to convert the class name (Kk) into an instance name (kk). What it would do in a case where the class name didn't start with a lower-case letter may not be what you think.

2. Your error message says it all: Target Unreachable, 'refugee' returned null)

In other words, you never initialized the property named "refugee" in your "kk" object. Since the EL expression:

effectively gets read as

and the getRefugee property method call is returning null (since refugee wasn't initialized). Which throws a NullPointerException that JSF intercepts and converts to an error message.

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