Dynamic class instantiation using Thread

Controller.java

public class Controller implements Runnable {
	
	private static Logger logger = Logger.getLogger(Controller.class);
	
	public void run() {
		
		logger.info("Starting subsystem AgentController");
		
		String sql = "select * from agent where active=true";
		
		DbConnector db = new DbConnector();
		ResultSet agentList = null;
		try {
			agentList = db.query(sql);
		} catch (ClassNotFoundException e) {
			
			e.printStackTrace();
		} catch (SQLException e) {
			
			e.printStackTrace();
		} catch (IOException e) {
			
			e.printStackTrace();
		}
		
		try {
			while (agentList.next()) {
				logger.info("Starting agent '" + agentList.getString("name") + "'");
				logger.info("Using class name: " + agentList.getString("class_name"));
				BaseAgent agent = (BaseAgent) Class.forName(agentList.getString("class_name")).newInstance();
				Thread agentThread = new Thread(agent);
				agentThread.start();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		} catch (InstantiationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		logger.debug("Closing database connection");
		try {
			db.close();
		} catch (IOException e) {
			
			e.printStackTrace();
		}

		logger.info("Agent controller finished.");
	}
}