java code to connect weblogic datasource to particular target - jdbc

Question

I have requirement in which i need to connect to datasource each individual target.
If datsource has two target then i need to connect to both target one by one.
I am using below code for datasource connection.
Need to know how to connect to individual target of datasource
public class ConnectWLSDataSource {
public static void main(String[] args) {
Connection conn;
Statement stmt;
ResultSet rs;
String str1;
try {
Properties prop = new Properties();
prop.put(Context.INITIAL_CONTEXT_FACTORY, “weblogic.jndi.WLInitialContextFactory”);
prop.put(Context.PROVIDER_URL, “t3://HOST_NAME:PORT_NUMBER”);
Context ctx = new InitialContext(prop);
Object obj = ctx.lookup(“DATA_SOURCE_NAME”); // java:comp/env/CPDS
System.out.println(“Data Source Found….”);
DataSource ds = (DataSource) obj;
conn = ds.getConnection();
System.out.println(“Data Source User Name::”+conn.getMetaData().getUserName());
stmt = conn.createStatement();
String query = “select 1 from dual”;
System.out.println(“Query ” + query);
rs = stmt.executeQuery(query);
if (rs != null) {
System.out.println(“Some Data Found in Query”);
} else {
System.out.println(“No Data Found in Query”);
}
ctx.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}

Answer 1

All you need to do is change the PROVIDER_URL to the specific host you want. For instance we have 4 servers running in a cluster and can choose to use a load balancer if we want to round-robin the connections or we can pick one specific server in the cluster.

Answer 2

we face issue when using this code, and get below exception. in all if 100 requests are serviced one fails with the below exception.
javax.naming.CommunicationException [Root exception is java.net.ConnectException: t3://prod.abc.com:7114: Destination unreachable; nested exception is:
java.net.SocketTimeoutException: Read timed out; No available router to destination].