Sun Java System Application Server Platform Edition 8.2 Administration Reference


Variables and variable references are needed for two reasons:

Variable references appear in the domain.xml file as strings that begin with the characters ${ and end with the character }. For example, the string ${com.sun.enterprise.myVar} is a reference to the variable com.sun.enterprise.myVar .

Variables are defined both outside of and within domain.xml. Predefined variables that exist outside of domain.xml are defined as Java System Properties. Within domain.xml, a variable is defined using the system-property element or the jvm-options element.

The system-property element’s name attribute is the name of a variable; its value attribute is the definition of the variable. For example, the following system-property element defines a port-number variable with the value 6500:

<system-property name="port-number" value="6500"/>

Multiple system-property subelements are permitted within server, config, and domain elements.

A variable defined in the jvm-options element is a Java System Property with the -D flag. For example, the following jvm-options element defines a port-number variable with the value 5500:


Multiple definitions for the same variable are permitted. The Application Server determines the actual value of a variable by searching for its first definition in a strict hierarchy of the elements within domain.xml. The hierarchy is as follows:

server -> config -> jvm-options -> domain -> System

Implicit in this hierarchy is the notion of reference and containment. A variable referenced in a server element is only looked up: