最近我在练习jdbc时做了个测试jsp页面，但是发现一个恼人的问题，就是我无法使用ojdbc5.jar作为驱动jar包连接oracle数据库（因为总是报异常），而使用ojdbc14.jar却可以正常连接数据库 （plsql也能正常连接）。小弟在网上寻找可是总也找不到解决办法，所以想请教各位究竟是什么原因造成这个问题的呢？
代码如下：

login_check.jsp:

<% String url="jdbc:oracle:thin:@localhost:1521:HDGATE1"; String db_user="HD_GATE"; String db_pwd="HD_GATE"; Class.forName("oracle.jdbc.driver.OracleDriver"); //oracle.jdbc.driver.OracleDriver Connection conn=DriverManager.getConnection(url,db_user,db_pwd); String sql= "select * from tb_users"; Statement stmt=conn.createStatement(); ResultSet rs=stmt.executeQuery(sql); rs.next(); String i = rs.getString("USER_NAME"); String s = rs.getString("PASSWORD"); System.out.println("ROW = " + i + " " + s ); %>

异常信息：

严重: Servlet.service() for servlet [jsp] in context with path [/test_connection] threw exception [javax.servlet.ServletException: java.sql.SQLException: IO 错误: Undefined Error] with root cause oracle.net.ns.NetException: Undefined Error at oracle.net.ns.NSProtocol.connect(NSProtocol.java:395) at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1102) at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:320) at oracle.jdbc.driver.PhysicalConnection.(PhysicalConnection.java:546) at oracle.jdbc.driver.T4CConnection.(T4CConnection.java:236) at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32) at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:521) at java.sql.DriverManager.getConnection(DriverManager.java:571) at java.sql.DriverManager.getConnection(DriverManager.java:215) at org.apache.jsp.login_005fcheck_jsp._jspService(login_005fcheck_jsp.java:103) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1852) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745)

我的项目环境是：
OS:windows8.1 专业版
数据库:oracle 11g 64位
服务器：tomcat 7
java：jdk:1.7