JDeveloper 12c: using Expression Language in pageDef to switch ControllerClass by Timo Hahn

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An interesting question came up late 2018 in the JDeveloper & ADF forum. A user asked how to use Expression Language (EL) in a pageDef file to switch the ControllerClass at runtime depending on some condition of a page.

The ControllerClass can be used to add custom code into the lifecycle of a page or fragment (see the full details at 27.4 Customizing the ADF Page Lifecycle). A tip

Tip:
You can specify the value of the page definition’s ControllerClass attribute as a fully qualified class name or you can enter an EL expression that resolves to a class directly in the ControllerClass field.
When using an EL expression for the value of the ControllerClass attribute, the Structure window may show a warning indicating that e “#{YourExpression}” is not a valid class. You can safely ignore this warning.

given in the documentation mentioned that you can use EL to specify the ControllerClass. The missing information is exactly how to do it.

Use Case

For a JSF page, a ControllerClass should be defined at runtime. The selected ControllerClass should depend on a condition. Read the complete article here.

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Technorati Tags: PaaS,Cloud,Middleware Update,WebLogic, WebLogic Community,Oracle,OPN,Jürgen Kress

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