::::::::java连接数据库问题::::::::（召唤各位大虾ing）

程序运行后返回这样的信息：
Error creating class: COM.ibm.db2.jdbc.app.DB2Driver
Closing connections...

代码如下：
package chinalife;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

class Adon extends Object {

public static void main(String[] args) {
String driverName = "COM.ibm.db2.jdbc.app.DB2Driver";
String connectURL = "jdbc:db2:ebs";
Connection db = null;

try {
Class.forName(driverName);
db = DriverManager.getConnection(connectURL);

} catch (ClassNotFoundException e) {
System.out.println("Error creating class: " + e.getMessage());
} catch (SQLException e) {
System.out.println("Error creating connection: " + e.getMessage());
} finally {
System.out.println("Closing connections...");
try {
db.close();
} catch (SQLException e) {
System.out.println("Can't close connection.");
}
}
}

}



请问个为大虾，此错误怎么产生怎么解决
而且原来连接数据库使用如下代码可以正确连接：
IBMJdbcConn ibmjdbcconn = getPooledConnection(getDriver(), getURL(), getUserID(), password);
connBean = new DatabaseConnection(ibmjdbcconn.getJdbcConnection());
if(connBean == null)
{
return;
} else
{
......


哪种连接方式更好一些，且为什么，呵呵。