Mastering JavaServer Faces 2.2

Writing a custom EL resolver

EL flexibility can be tested by extending it with custom implicit variables, properties, and method calls. This is possible if we extend the VariableResolver or PropertyResolver class, or even better, the ELResolver class that give us flexibility to reuse the same implementation for different tasks. The following are three simple steps to add custom implicit variables:

1. Create your own class that extends the ELResolver class.
2. Implement the inherited abstract methods.
3. Add the ELResolver class in faces-config.xml.

Next, you will see how to add a custom implicit variable by extending EL based on these steps. In this example, you want to retrieve a collection that contains the ATP singles rankings using EL directly in your ...