1 & 2) You should get the data source via JNDI, as follows:
InitialContext ctx = new InitialContext();
| DataSource ds = (DataSource)ctx.lookup("PostgresDS");
| Connection conn = ds.getConnection();
| -- do stuff with the connection --
| conn.close();
3) Yes. The close() method, above, returns the connection to the pool.
4) You have already done that. There are 5 initial connection established.
You will have at most 100 connections. Though I can't remember off hand if the
connections are established at server startup or the first time you attempt to
access one. I think it is the later, in which case you could make
initialization code in your app access a connection, that would get the
connections established at server startup time.
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