> Can I specify the DB parameters in a jndi.properties file that my
standalone
> app accesses, just like Tomcat's server.xml specifies Resources and
> ResourceParams? (i.e. maxActive, maxIdle, url, etc in a
jndi.properties
> file).
>
Details would depend on which JNDI provider you use, and how it's
configured. But you'll definitely need to do some sort of external
configuration.
> If we CAN specify such properties and access them throughout the
webapp,
> what is the point of specifying them in Tomcat's server.xml file? I
ask
> because if we need JNDI lookup of a DataSource in Tomcat you have to
> manually configure the server.xml file to use it. This goes against
the
> principle of packaging things in a nice self-contained .war file and
having
> the application work just by dropping it in to the webapp directory
(that
> is, there should be no external configuration necessary outside of
the war
> context).
>
My main goal now is to create an InitialContext through a
jndi.properties file. I am new to jndi and I don't know how to best
approach the task. I'm trying to create a simple login that relies on a
connection pool.
I, like Les Hazlewood, wish to use a distributable, reusable component
that does not rely on server.xml configuration.
I have posted my code on Tomcat-user forum, but it got ignored there.
This forum, especially this thread, is closer to my goals.
Here's my broken code: (you can see I am really lost here)
public void init() throws Exception {
if (ds != null) return;
ResourceBundle SQL = ResourceBundle.getBundle("jndi");
Hashtable env = new Hashtable(9);
env.put(Context.INITIAL_CONTEXT_FACTORY, this);
env.put(Context.PROVIDER_URL, SQL.getString("factory"));
env.put(Context.SECURITY_AUTHENTICATION, SQL.getString("username"));
env.put(Context.SECURITY_CREDENTIALS, SQL.getString("password"));
env.put(Context.PROVIDER_URL, SQL.getString("url"));
Context ctx = new InitialContext(env);
ctx.addToEnvironment("driverClassName",
SQL.getString("driverClassName"));
ctx.addToEnvironment("maxActive", SQL.getString("maxActive"));
ctx.addToEnvironment("maxIdle", SQL.getString("maxIdle"));
ctx.addToEnvironment("maxWait", SQL.getString("maxWait"));
if(ctx == null)
throw new Exception("No Context");
String CONTEXT_LOOKUP_ADDRESS = SQL.getString("context.lookup");
try{
ds = (DataSource)ctx.lookup("java:comp/env/jdbc/WebPool");
}
catch(Exception e){
throw new Exception("Context Address invalid: "
+
CONTEXT_LOOKUP_ADDRESS+" "+ e.toString());
}
}
=====
Garrett Smith
http://dhtmlkitchen.com/
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