Operators and Literals

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, <=, le, >=, ge.
  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.
• .after, .before, .equals: Date comparison operators.

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:

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