Type Coercion

EL expressions will coerce the type automatically. Here is the summary of the coercion rules.

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Note: The coercion is also applied to function arguments. For example, {c:doSomething(null)} will cause doSomething("") being called if it expects a String object.

	Boolean	Character	Number	String
Boolean	obj	ERROR	ERROR	obj.toString()
Character	ERROR	obj	(short)obj	obj.toString()
Number	obj	ERROR	(char)obj	obj.toString()
String (not empty)	Boolean.valueOf(obj)	obj.charAt(0)	Number.valueOf(x)	obj
String (empty)	false	(char)0	0	"" (obj)
null	false	(char)0	0	""
Other	ERROR	ERROR	ERROR	obj.toString()

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• The handling of an empty string and null is the same

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