Sun GlassFish Enterprise Server 2.1 Developer's Guide

Query Filter Expression

The filter expression is a String containing a Boolean expression evaluated for each instance of the candidate class. If the filter is not specified, it defaults to true. Rules for constructing valid expressions follow the Java language, with the following differences:

Note –

Comparisons between floating point values are by nature inexact. Therefore, equality comparisons (== and !=) with floating point values should be used with caution. Identifiers in the expression are considered to be in the name space of the candidate class, with the addition of declared parameters and variables. As in the Java language, this is a reserved word, and refers to the current instance being evaluated.

The following expressions are supported.

The rules for promotion follow the Java rules extended by BigDecimal, BigInteger, and numeric wrapper classes. See the numeric promotions of the Java language specification.