These types of configurable properties are called environment entries . The
bean can use environment entries to customize its behavior.
Although they can be defined using annotations, environment entries are almost
always configured via XML, as they really are configuration values and not
metadata. The <env-entry> element is used to define them. This element contains
the subelements (optional), <env-entry-name> (required), <env-entry-type>
(required), and <env-entry-value> (optional), as well as the element
<injection-target> (optional). Here is a typical <env-entry> declaration:
<ejb-jar>
<enterprise-beans>
<ejb-name>ProcessPaymentBean</ejb-name>
<env-entry>
<env-entry-name>minCheckNumber
</env-entry-name>
<env-entry-type>java.lang.Integer</env-entry-type>
<env-entry-value>2000</env-entry-value>
</env-entry>
</enterprise-beans>
</ejb-jar>
The <env-entry-name> element is relative to the java:comp/env context. For
example, the minCheckNumber entry can be accessed using the path
java:comp/env/minCheckNumber in a JNDI ENC lookup:
InitialContext jndiContext = new InitialContext( );
int minValue = (Integer) jndiContext.lookup("java:comp/env/minCheckNumber");
Alternatively, it can be looked up with the EJBContext.lookup( ) method using
the minCheckNumber name.
<env-entry-type> can be of type String or one of the several primitive wrapper
types, including Integer, Long, Double, Float, Byte, Boolean, and Short.
<env-entry-value> is optional. The value can be specified by the bean developer
or deferred to the application assembler or deployer.
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