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In my .xhtml file, I have the following SelectOneMenu component:

<ui:define name="formContent"> <h:selectOneMenu value="#{mrBean.itemCategoryID}"> <f:ajax render="abc def" execute="@this" listener="#{mrBean.getListOfItems}"></f:ajax> <f:selectItem itemLabel="Choose one .." itemValue="0" noSelectionOption="true" /> <f:selectItems value="#{mrBean.itemCategories}" var="ic" itemLabel="#{ic.name}" itemValue="#{ic.id}" /> </h:selectOneMenu> <h:panelGrid id="abc" columns="3" border="1"> <h:outputText style="font-weight: bold" value="Name"/> <h:outputText style="font-weight: bold" value="Producer" /> <h:outputText /> </h:panelGrid> <h:panelGroup id="def" > <ui:repeat value="#{mrBean.items}" var="i"> <h:form id="BuyItemForm"> <h:panelGrid columns="3" border="1"> <h:outputText style="font-weight: normal" value="#{i.name}" /> <h:outputText style="font-weight: normal" value="#{i.producer.name}" /> <h:commandButton value="Buy" actionListener="#{mrBean.buyItem}" > <f:param name="itemID" value="#{i.id}" /> </h:commandButton> </h:panelGrid> </h:form> </ui:repeat> </h:panelGroup> </ui:define>

When I open the page, it can load normally with the menu populated properly. However, when I choose 1 of the option, I ran into the following error:

SEVERE: javax.faces.component.UpdateModelException: javax.el.ELException: /partner/BuyItem.xhtml @53,81 value="#{mrBean.itemCategoryID}": Can't set property 'itemCategoryID' on class 'managedBean.MrBean' to value 'null'. ... Caused by: javax.el.ELException: /partner/BuyItem.xhtml @53,81 value="#{mrBean.itemCategoryID}": Can't set property 'itemCategoryID' on class 'managedBean.MrBean' to value 'null'. at com.sun.faces.facelets.el.TagValueExpression.setValue(TagValueExpression.java:139) at javax.faces.component.UIInput.updateModel(UIInput.java:818) ... 47 more Caused by: java.lang.IllegalArgumentException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at javax.el.BeanELResolver.setValue(BeanELResolver.java:381) at com.sun.faces.el.DemuxCompositeELResolver._setValue(DemuxCompositeELResolver.java:255) at com.sun.faces.el.DemuxCompositeELResolver.setValue(DemuxCompositeELResolver.java:281) at com.sun.el.parser.AstValue.setValue(AstValue.java:197) at com.sun.el.ValueExpressionImpl.setValue(ValueExpressionImpl.java:286) at com.sun.faces.facelets.el.TagValueExpression.setValue(TagValueExpression.java:131) ... 48 more

EDIT: this is my bean with getListOfItems function:

@ManagedBean @ViewScoped public class MrBean { @EJB private PartnerBeanLocal partnerBean; @ManagedProperty(value="0") private long itemCategoryID; private List<ItemState> items; ... public void getListOfItems() { try { System.out.println(itemCategoryID); // I never saw this line printed out ArrayList data = partnerBean.getInfo(Constants.GET_LIST_OF_ITEMS, itemCategoryID); int result = ((Integer) data.get(0)).intValue(); if (result == Constants.STATUS_SUCCESSFUL) items = (List<ItemState>) data.get(1); else if (result == Constants.STATUS_NOT_FOUND) FacesContext.getCurrentInstance().getExternalContext().redirect("HomePage.xhtml"); } catch (IOException ex) { Logger.getLogger(MrBean.class.getName()).log(Level.SEVERE, null, ex); } } ... // Getters and Setters ... public long getItemCategoryID() { return itemCategoryID; } public void setItemCategoryID(long itemCategoryID) { this.itemCategoryID = itemCategoryID; } public List<ItemState> getItems() { return items; } public List<ItemState> setItems(List<ItemState> items) { this.items = items; } ... }

I'd be very grateful if someone could give me an advice on how to tackle this problem.

EDIT 2: Thanks everyone for helping me! The problem was that I stupidly forgot to put the <f:ajax> tag inside a <h:form> tag.

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  • Would help to have the code from the mrBean too... Commented Oct 26, 2011 at 13:35
  • Looks like somehow null is being passed and java.lang.IllegalArgumentException is thrown while trying to update model value. Can you post your managed-bean code? Commented Oct 26, 2011 at 13:37
  • From what I saw, when I choose an option, an Ajax call was made. However, my bean function getListOfItems was never fired. Commented Oct 26, 2011 at 13:38
  • When you choose (combobox open and populated)? or when you click on the combobox ??? Commented Oct 26, 2011 at 13:42
  • Is itemCategoryID of type int or Integer? Commented Oct 26, 2011 at 13:43

4 Answers 4

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Here is what I tried:

@ManagedBean @ViewScoped public class MrBean implements Serializable { @ManagedProperty(value="0") private long itemCategoryID; private List<ItemCategory> itemCategories; @PostConstruct public void init() { this.itemCategories = new ArrayList<ItemCategory>(); this.itemCategories.add(new ItemCategory("Item1", 1)); this.itemCategories.add(new ItemCategory("Item2", 2)); this.itemCategories.add(new ItemCategory("Item3", 3)); } public void getListOfItems() { System.out.println(Thread.currentThread().getStackTrace()[1]); System.out.println("itemCategoryID: " + this.itemCategoryID); } public List<ItemCategory> getItemCategories() { return itemCategories; } public void setItemCategories(List<ItemCategory> itemCategories) { this.itemCategories = itemCategories; } public long getItemCategoryID() { return itemCategoryID; } public void setItemCategoryID(long itemCategoryID) { this.itemCategoryID = itemCategoryID; } }

with:

<h:form> <h:selectOneMenu value="#{mrBean.itemCategoryID}"> <f:ajax execute="@this" listener="#{mrBean.getListOfItems}"></f:ajax> <f:selectItem itemLabel="Choose one .." itemValue="0" noSelectionOption="true" /> <f:selectItems value="#{mrBean.itemCategories}" var="ic" itemLabel="#{ic.name}" itemValue="#{ic.id}" /> </h:selectOneMenu> </h:form>

And it works without any problem.

Might be the version of JSF (EL) you have, or you have problem somewhere else.

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1

The <f:ajax> tag need to be wrapped inside a <h:form> tag.

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Seems like some of your item values are null. If you want to accept null, use Long instead of long.

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I had the same issue and it was resolved by changing my variable type boolean to Boolean

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1 Comment

You had the same exception you mean… not the same issue ;-)

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