try {

Context ctx = new InitialContext();

if (ctx == null) {

throw new Exception("Context Look Up Error");

}

DataSource dsource = (DataSource)ctx.lookup("java:comp/env/jdbc/cartDB");

if (dsource != null) {

System.out.println("---------------------------------------------------");

con = dsource.getConnection();

}

}

。。。

错误如下：

2004-6-4 23:32:41 org.apache.coyote.http11.Http11Protocol start

信息: Starting Coyote HTTP/1.1 on port 8083

------------------------------------------------------------

数据连接池连接错误：Cannot load JDBC driver class 'null'

java.sql.SQLException: Cannot load JDBC driver class 'null'

at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:529)

at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:312)

at flowershop.DBConnection.initDataSource_Connection(DBConnection.java:89)

at flowershop.DBConnection.<init>(DBConnection.java:29)

DataSource对象已经生成，就是不能获得连接，请问这是什么原因造成的？