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Editorial Team
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Asked: 2026-06-09T14:40:49+00:00

I use a arrayList. I want data store in it from Entity class.But it

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I use a arrayList. I want data store in it from Entity class.But it store current data and previous data remove from it.
My JSF page Code:

  <html xmlns="http://www.w3.org/1999/xhtml"
  xmlns:h="http://java.sun.com/jsf/html"
  xmlns:p="http://primefaces.org/ui"
  xmlns:c="http://java.sun.com/jsp/jstl/core">
<h:head>
    <title>Facelet Title</title>
</h:head>
<h:body>
    <h:form>
        <h:outputText value="ID"/><br/>
        <h:inputText value="#{dataTestBeans.data.id}"/><br/>
        <h:outputText value="Name"/><br/>
        <h:inputText value="#{dataTestBeans.data.name}"/><br/>
        <h:outputText value="Address"/><br/>
        <h:inputText value="#{dataTestBeans.data.address}"/><br/>
        <h:outputText value="Birth Day"/><br/>
        <h:inputText value="#{dataTestBeans.data.birthDay}"/><br/>
        <h:commandButton action="#{dataTestBeans.abc}" value="Submit" />
    </h:form>
    <h:form>
        <c:forEach items="#{dataTestBeans.testArray}" var="dataTest">
            <h:outputText value="#{dataTest.id}"/><br/>
            <h:outputText value="#{dataTest.name}"/><br/>
            <h:outputText value="#{dataTest.address}"/><br/>
            <h:outputText value="#{dataTest.birthDay}"/><br/>
        </c:forEach>
    </h:form>
  </h:body>
 </html>

My Entity Class code:

@ManagedBean(name = "person")
@SessionScoped
public class Person{

private String id;
private String name;
private String address;
private String birthDay;

public Person() {
}
    //getter and setter all veriable

}

My controller Beans code: 

@ManagedBean(name="dataTestBeans")
@SessionScoped
public class DataTestBeans {

private Person dataArray;
private List<Person> person = new ArrayList<Person>();   

public DataTestBeans() {
 }

public Person getData() {
  if (dataArray == null) {
      dataArray = new Person();
  }
 return dataArray;
 }

public void abc() {
   person.add(dataArray);
 }

public List<Person> getTestArray() {
  return person;
 }

public void setTestArray(List<Person> person) {
    this.person = person;
  }
}

When I run it show the current data

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1 Answer

  1. Editorial Team

    You’re reusing the same reference for every data entry. Hence you’re basically overwriting it everytime. You should be creating a new one after you’ve added the filled entry in your abc() method.

    Replace the following part in your current code:

    private TestArray dataArray;
private List<TestArray> testArray = new ArrayList<TestArray>();

public DataTestBeans() {
}

public TestArray getData() {
    if (dataArray == null) {
        dataArray = new TestArray();
    }
    return dataArray;
 }

public void abc() {
    testArray.add(dataArray);
}

    by

    private TestArray dataArray;
private List<TestArray> testArray;

public DataTestBeans() {
    dataArray = new TestArray();
    testArray = new ArrayList<TestArray>()
}

public TestArray getData() {
    return dataArray;
 }

public void abc() {
    testArray.add(dataArray);
    dataArray = new TestArray();
}

    See also:

    Unrelated to the concrete problem, your class and variable namings are non-sensible and very confusing and therefore it’s hard for others to quickly interpret the code and spot the problem. Rename TestArray to Person, rename dataArray to person, rename testArray to persons and rename DataTestBeans to PersonManager or something and your code becomes instantly much more self-documenting and easier to interpret.

    private Person person;
private List<Person> persons;

public PersonManager() {
    person = new Person();
    persons = new ArrayList<Person>()
}

public Person getPerson() {
    return person;
 }

public void add() {
    persons.add(person);
    person = new Person();
}
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