JavaServer Pages, 3rd Edition

Conversions Performed by the Container

The container automatically takes care of the conversion from text values to the most commonly used Java types. A JSP 2.0-compliant container supports the type conversions shown in Table 22-2.

Table 22-2. Conversion of text value to property type

Property type	Conversion method
boolean or Boolean	Boolean.valueOf(String), false for an empty string
byte or Byte	Byte.valueOf(String), 0 for an empty string
char or Character	String.charAt(0), 0 for an empty string
double or Double	Double.valueOf(String), 0 for an empty string
int or Integer	Integer.valueOf(String), 0 for an empty string
float or Float	Float.valueOf(String), 0 for an empty string
long or Long	Long.valueOf(String), 0 for an empty string
short or Short	Short.valueOf(String), 0 for an empty string
Object	new String(String)

These rules apply to attributes for standard actions and custom actions alike.