Configuring DataSource and Registering it with JNDI

Question

I follow up the java doc java doc for datasource.

I am not understanding the below code snippt.

I create a connectionpooldatasource and register with jndi.

cpds.setServerName("creamer");
cpds.setDatabaseName("COFFEEBREAK");
cpds.setPortNumber(9040);
cpds.setDescription("Connection pooling for " + "COFFEEBREAK DBMS");

Context ctx = new InitialContext();
ctx.bind("jdbc/pool/fastCoffeeDB", cpds);

Now we can retrive this connection pool data source

Context ctx = new InitialContext();
ctx.lookup("jdbc/pool/fastCoffeeDB");

I create an another datasource and register it.

com.applogic.PooledDataSource ds = new 
com.applogic.PooledDataSource();
ds.setDescription("produces pooled connections to COFFEEBREAK");
ds.setDataSourceName("jdbc/pool/fastCoffeeDB");

Context ctx = new InitialContext();
ctx.bind("jdbc/fastCoffeeDB", ds);

Now we can retrive this connection pool data source

ctx = new InitialContext();
ds = (DataSource)ctx.lookup("jdbc/fastCoffeeDB");

I am not clear about setDataSourceName.

We add ConnectionPoolDS into PoolDataSource.

when we retrive the datasource

 ds = (DataSource)ctx.lookup("jdbc/fastCoffeeDB");

then the data soruce return from here is PoolDataSource type or ConnectionPoolDS type?.

Answer 1

using this

jdbc/pool/fastCoffeeDB JNDI you are directly pointing to COFFEEBREAK database.

in second JNDI

jdbc/fastCoffeeDB

you are using following statement

ds.setDataSourceName("jdbc/pool/fastCoffeeDB");

In the above you are pointing old JNDI name, this means you are indirectly points to COFFEEBREAK database

so from statement ds = (DataSource)ctx.lookup("jdbc/fastCoffeeDB"); you will get ConnectionPoolDS.