The closest portable support for this in Java EE is the use of environment entries.
Environment entries are simple values (primitives or strings) that are assigned a
name within a private component environment and given a value in the component's
deployment descriptor.
E.g. You could define the following in a servlet
@Resource(name="targetAddr") private String targetAddress;
Then in the web.xml add the following :
<env-entry>
<env-entry-name>targetAddr</env-entry-name>
<env-entry-type>java.lang.String</env-entry-type>
<env-entry-value>
http://www.something.com</env-entry-value>
</env-entry>
At runtime, the servlet instance targetAddress field will be injected with the configured value.
Like all environment dependencies, this value can also be looked up via
the component environment as follows :
String address = (String) new InitialContext().lookup("java:comp/env/targetAddr");
--ken
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