Example of enabling Db2 on Linux, UNIX, and Windows systems automatic client reroute support in Java applications
Java™ client setup for Db2 on Linux, UNIX, and Windows systems automatic client reroute support includes setting several IBM® Data Server Driver for JDBC and SQLJ properties.
The following example demonstrates setting up Java client applications for Db2 on Linux, UNIX, and Windows systems automatic client reroute support.
Suppose that your installation has a primary server and an alternate
server with the following server names and port numbers:
| Server name | Port number |
|---|---|
| srv1.sj.ibm.com | 50000 |
| srv3.sj.ibm.com | 50002 |
The following code sets up DataSource properties
in an application so that the application connects to srv1.sj.ibm.com
as the primary server, and srv3.sj.ibm.com as the alternative server.
That is, if srv1.sj.ibm.com is down during the initial connection,
the driver should connect to srv3.sj.ibm.com.
ds.setDriverType(4);
ds.setServerName("srv1.sj.ibm.com");
ds.setPortNumber("50000");
ds.setClientRerouteAlternateServerName("srv3.sj.ibm.com");
ds.setClientRerouteAlternatePortNumber("50002");
The following code configures JNDI for automatic client reroute. It creates an instance of DB2ClientRerouteServerList, binds that instance to the JNDI registry, and assigns the JNDI name of the DB2ClientRerouteServerList object to the clientRerouteServerListJNDIName property.
// Create a starting context for naming operations
InitialContext registry = new InitialContext();
// Create a DB2ClientRerouteServerList object
DB2ClientRerouteServerList address = new DB2ClientRerouteServerList();
// Set the port number and server name for the primary server
address.setPrimaryPortNumber(50000);
address.setPrimaryServerName("srv1.sj.ibm.com");
// Set the port number and server name for the alternate server
int[] port = {50002};
String[] server = {"srv3.sj.ibm.com"};
address.setAlternatePortNumber(port);
address.setAlternateServerName(server);
registry.rebind("serverList", address);
// Assign the JNDI name of the DB2ClientRerouteServerList object to the
// clientRerouteServerListJNDIName property
datasource.setClientRerouteServerListJNDIName("serverList");