setVariable(String variable,
ValueExpression expression)
Assign a ValueExpression to an EL variable, replacing
any previously assignment to the same variable.
Assign a ValueExpression to an EL variable, replacing
any previously assignment to the same variable.
The assignment for the variable is removed if
the expression is null.
Parameters:
variable - The variable name
expression - The ValueExpression to be assigned
to the variable.
Returns:
The previous ValueExpression assigned to this variable,
null if there is no previouse assignment to this variable.