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For Groovy expressions refer the different sections in "Introduction to Groovy Support in JDeveloper and Oracle ADF 11g".
Groovy expressions in ADF Business Components Entity Objects
Referencing attributes in the same entity
Referencing custom methods in the EntityImpl class
Referencing base class methods in the EntityImpl class
Using Groovy expressions in error messages
Referencing attribtues in other entities
Referencing built-in calls
Groovy Expressions in ADF Business Components View Objects
Also refer "Groovy in ADF"
"Groovy Expression In ADF"
ORACLE ADF : Groovy Expression In ADF