Operators

In addition to the . and [] operators, the expression language provides the following operators:

Arithmetic: +, - (binary), *, / and div, % and mod, - (unary)
Logical: and, &&, or, ||, not, !
Relational: ==, eq, !=, ne, <, lt, >, gt, <=, ge, >=, le.
Comparisons can be made against other values, or against boolean, string, integer, or floating point literals.
Empty: The empty operator is a prefix operation that can be used to determine whether a value is null or empty.

The precedence of operators highest to lowest, left to right is as follows:

[] .
() - Used to change the precedence of operators.
- (unary) not ! empty
* / div % mod
+ - (binary)
< > <= >= lt gt le ge
== != eq ne
&& and
|| or
? :

Some Examples:

Formula	Output
${5 + 3}	8
${5 - 3}	2
${5 / 3}	1.67
${5 * 3}	15
${5 % 3}	2
${5 > 3} or ${5 gt 3}	Yes
${5 >= 5} or ${5 >= 5}	Yes
${5 < 3} or ${5 lt 3}	No
${5 <= 5} or ${5 le 3}	Yes

Literals

The JSP expression language defines the following literals:

Boolean: true and false. For example, ${entity.critical == true}, where entity is a task
String: with single and double quotes; " is escaped as \", ' is escaped as \', and \ is escaped as \\.
Null: null

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