Initialize a composite component based on the provided attributes

Question

I\'m writing my custom table composite component with Mojarra JSF. I\'m also trying to bind that composite to a backing component. The aim is to be able to specify the numbe

Answer 1

As to the cause, UIComponent instances are inherently request scoped. The postback effectively creates a brand new instance with properties like values reinitialized to default. In your implementation, it is only filled during encodeXxx(), which is invoked long after decode() wherein the action event needs to be queued and thus too late.

You'd better fill it during the initialization of the component. If you want a @PostConstruct-like hook for UIComponent instances, then the postAddToView event is a good candidate. This is invoked directly after the component instance is added to the component tree.

    
    ...

with

private List values;

public void init() {
    values = new ArrayList();
    Integer num = (Integer) getAttributes().get("value");

    for (int i = 0; i < num; i++) {
        values.add("item" + i);
    }
}

(and remove the encodeBegin() method if it isn't doing anything useful anymore)

An alternative would be lazy initialization in getValues() method.