Method of access in a bean via EL

JDeveloper version - 11.1.1.7.0

I created a bean and recorded in my workflow with a scope of request.

A method in my work flow refers to the bean to initialize certain values. As shown in the image below the bean appears on 2 places in the expression builder. I first tried using within the RequestScope (Option 2 in the image). On the page running, there was an exception


javax.el.PropertyNotFoundException: inaccessible target, 'PrepareSessionBean' returned null

Then I just tried to use the device to off the staves (1 Option of the image) and this time the page loaded. So I was wondering what difference does it make when selecting the two sections and also to be used whenbean?

1.jpg

Difference lies in the scope prefix.

As a general rule, you should never put prefix in scope to scopes of standard servlet (application, session, and application).

If you put the prefix in scope, bean must be instantiated before or your EL will evaluate to null.

When you do not prefix scope, JSF will instantiate bean if it is not already instantiated.

For reasons specific to the ADF (backingBean, view, pageFlow), you must add the prefix so frame can handle them.

Dario

Tags: Java

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