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Asked: 2026-06-15T00:42:29+00:00

i want to set value in array but receive Classcastexception.. example of code: page.xhtml

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i want to set value in array but receive Classcastexception..

example of code:
page.xhtml

<html xmlns="http://www.w3.org/1999/xhtml"
  xmlns:f="http://java.sun.com/jsf/core"
  xmlns:h="http://java.sun.com/jsf/html"
  xmlns:p="http://primefaces.org/ui">
<h:head>
    <title>Really simple CRUD</title>
</h:head>
<h:body>
    <h:form id="form">
        <p:growl autoUpdate="true" showDetail="true"/>
        <h:selectOneMenu converter="javax.faces.Integer" value="#{adminMBean.a[0]}">
            <f:selectItem itemLabel="1" itemValue="1"/>
            <f:selectItem itemLabel="2" itemValue="2"/>
        </h:selectOneMenu>
        <h:commandButton value="ok" action="#{adminMBean.ok()}"/>
        <h:outputText value="sa:#{adminMBean.a[0]}"/>
    </h:form>
</h:body>


@ManagedBean(name = "adminMBean")
@RequestScoped
public class AdminMBean {
  int[] a=new int[1];
public AdminMBean(){}
    public int[] getA() {
    return a;
}
public void setA(int[] a) {
    this.a = a;
}
}

how to set value into array with selectonemenu?

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1 Answer

  1. Editorial Team

    Have you read the ClassCastException message? It should be something like this:

    java.lang.ClassCastException: Unable to add an object of type [java.lang.Integer] to an array of objects of type [int]

    See, you should be using Integer[] instead of int[].

    private Integer[] a = new Integer[1];

public Integer[] getA() {
    return a;
}

    The setter is by the way unnecessary. It wouldn’t be used in this construct.

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