Multiple instances of managed bean

Question

I\'m using prime-faces Tabs to display multiple input forms. The problem is, there are times when I need to instantiate 2 of the same form. They both of course use the same Mana

Answer 1

If you want to use the multiple instance of manager bean, then you can declared it in faces-config.xml file with different names and use its independently. See example

<managed-bean>
    <managed-bean-name>productSearchForm</managed-bean-name>
    <managed-bean-class>com.company.package.ProductSearchForm</managed-bean-class>
    <managed-bean-scope>session</managed-bean-scope>
</managed-bean>

<managed-bean>
    <managed-bean-name>productChildFilter</managed-bean-name>
    <managed-bean-class>com.company.package.ProductSearchForm</managed-bean-class>
    <managed-bean-scope>session</managed-bean-scope>
</managed-bean>

<managed-bean>
    <managed-bean-name>productAttachFilter</managed-bean-name>
    <managed-bean-class>com.company.package.ProductSearchForm</managed-bean-class>
    <managed-bean-scope>session</managed-bean-scope>
</managed-bean>

Answer 2

Instead of trying to use multiple instances of a managed bean, use ONE managed bean that gives access to multiple instances of a class via e.g. a hashmap or arraylist or whatever you want to use. Just like you would in plain old java programming. You cannot have two variables with the same name:

@ViewScoped
@Named
public class RequestCalculations {

    Map<String, RequestCalculation> hm;

    @PostConstruct
    public init() {
        hm = new HashMap<>();
        // prepopulate if known upfront
        hm.put("1", new RequestCalculation());
        hm.put("2", new RequestCalculation());
    }

    public HashMap<String, RequestCalculation> getCalculations() {
        return hm;
    }
}

Then use the tabIndex of the tab as the key to the hashmap (or an array list). And in your xhtml do something like

#{requestCalculations.calculations[myTabIndex]}

You might need to pass this on to the include via a include param if you need this IN the include (as I think you do)