Question

I understand that should not work according to JEE6 tutorial.

<h:inputText value="${bean.name}/>

and managed bean

@ManagedBean
public class Bean {

    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

But it work perfectly and I can read the ‘name’ property from the response page. I thought it only work with deferred evaluation #{expr} for writable properties.

Answer 1

According to the JEE6 tutorial:

• Rvalue expressions can read data but cannot write it.
• All expressions that are evaluated immediately use the ${} delimiters and are always rvalue expressions

So that may lead you to think that you can’t use ${} in a writable property, but if you read later:

Where Value Expressions Can Be Used: Value expressions using the
${} delimiters can be used in:

• Static text
• Any standard or custom tag attribute that can accept an expression

So, if I’m not mistaken, this doesn’t contradict the former. It just means that when you use <h:inputText value="${bean.name}"/> it will be used to read the name property, but it won’t write it if you modify the content in the inputText.