MethodBinding is an object that can be used to call an arbitrary public method, on an instance that is acquired by evaluatng the leading portion of a method binding expression via a ValueBinding . 

PropertyResolver represents a pluggable mechanism for accessing a "property" of an underlying Java object instance. 

ValueBinding is an object that can be used to access the property represented by an action or value binding expression. 

VariableResolver represents a pluggable mechanism for resolving a top-level variable reference at evaluation time.

An exception reporting an error that occurred during the evaluation of an expression in a MethodBinding or ValueBinding .

An exception caused by a method name that cannot be resolved against a base object.

An exception caused by a property name that cannot be resolved against a base object.

An exception reporting a syntax error in a method binding expression or value binding expression.