Changing beans initialized before in faces-config.xml

public class MyBean {
    private Integer [] myField;


    public Integer [] getMyField() {
        return myField;
    }
    public void setMyField(Integer [] myField) {
        this.myField = myField;
    }

And I initialize this same bean in faces-config.xml in this way

<managed-bean-name>myBean</managed-bean-name>
        <managed-bean-class>com.path.bean.MyBean</managed-bean-class>
        <managed-bean-scope>request</managed-bean-scope>
        <managed-property>
            <property-name>myField</property-name>
            <list-entries>
                    <value>6</value>
                    <value>12</value>
                    <value>24</value>       
            </list-entries>
        </managed-property>        
    </managed-bean>

Then, in the application I want to change these values. To do it:

        MyBean myBean = new MyBean();
        Integer [] results = myBean.getMyfield();
        //Change开发者_Go百科 the value of this array
        visualizationBean.setResultsPerPage(results);

But this is not possible, Integer [] results = myBean.getMyfield() gives me a null. Anyway, in the interface of my application, I can see that the bean is correctly initialize, because it holds the values 6, 12 and 24.

Any kind of help?? Thanks in advance

As you instantiate MyBean using new, it won't look for the Faces-Config. and it will simply create an object using constructor.

If you are using jsf2.0 make bean to initialize when your context is being initialized using

@ManagedBean(eager=true)

and retrieve the Bean instance from scoped map. if its application scoped bean the.

MyBean mb = (MyBean)FacesContext.getCurrentInstance().getExternalContext().getApplicationMap().get("beanName");

Update:

your managed bean should look like ,

import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;

@ManagedBean(eager="true")
@RequestScoped
public class MyBean {

if you just want to use your bean in another bean then as BalusC suggested simply inject it and get the filled value , without using new

for example: if you want your MyBean poppulated in SomeOtherBean then

@ManagedBean()
@RequestScoped
public class SomeOtherBean {
   @ManagedProperty(value="#{myBean}") 
   private MyBean myBean;
   //getters & setters of myBean

Update

for jsf 1.2 , there is no annotations, you need to configure your faces-config.xml as shown below

<managed-bean>
    <managed-bean-name>myBean</managed-bean-name>
    <managed-bean-class>com.example.my.MyBean</managed-bean-class>
    <managed-bean-scope>request</managed-bean-scope>
</managed-bean>

<managed-bean>
    <managed-bean-name>someAnotherBean</managed-bean-name>
    <managed-bean-class>com.example.some.AnotherBean</managed-bean-class>
    <managed-bean-scope>request</managed-bean-scope>
    <managed-property>
        <property-name>myBean</property-name>
        <value>#{myBean}</value>
    </managed-property>
</managed-bean>

You are creating object using new like MyBean myBean = new MyBean();

So you are sure to get null.