我在Oracle jdbc下载页面http://www.oracle.com/technetwork/database/enterprise-
edition/jdbc-112010-090769.html中看到许多jar文件

我已经下载了以下驱动程序：

1. ojdbc6.jar
2. ojdbc6_g.jar
3. ojdbc6dms.jar
4. ojdbc6dms_g.jar
5. orai18n.jar

我正在尝试在Tomcat 7版本中使用它。我将所有这些jar文件添加到$ CATALINA_HOME /
lib文件夹中，但是几天后，我的Tomcat抛出此错误：

    HTTP Status 500 - Servlet execution threw an exception

type Exception report

message Servlet execution threw an exception

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Servlet execution threw an exception
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
root cause

java.lang.NoSuchMethodError: oracle.i18n.text.converter.CharacterConverterOGS.getInstance(I)Loracle/i18n/text/converter/CharacterConverter;
    oracle.sql.converter.CharacterConverterFactoryOGS.make(CharacterConverterFactoryOGS.java:40)
    oracle.sql.CharacterSetWithConverter.getInstance(CharacterSetWithConverter.java:135)
    oracle.sql.CharacterSetFactoryThin.make(CharacterSetFactoryThin.java:195)
    oracle.sql.CharacterSet.make(CharacterSet.java:555)
    oracle.jdbc.driver.DBConversion.init(DBConversion.java:236)
    oracle.jdbc.driver.DBConversion.<init>(DBConversion.java:133)
    oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1704)
    oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:385)
    oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:564)
    oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:251)
    oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:29)
    oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:563)
    java.sql.DriverManager.getConnection(DriverManager.java:571)
    java.sql.DriverManager.getConnection(DriverManager.java:215)
    DB.getOracleConnection(DB.java:13)
    IndexDAO.displayNewsTicker(IndexDAO.java:54)
    SiteTemplate.newsTicker(SiteTemplate.java:256)
    SiteTemplate.headerButtons(SiteTemplate.java:226)
    Index.doGet(Index.java:55)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.47 logs.

Apache Tomcat/7.0.47

我SQL*Plus: Release 11.2.0.2.0 Production搜索的oracle版本很多，但是大多数专家都在谈论jdbc驱动程序的重复或错误版本。我加倍检查了两个建议，但同样的问题。

现在我想到的问题是，我可能在tomcat lib文件夹中添加了错误的jar。我的意思是可能我需要1-2个jar文件，但是添加了5个前面提到的jdbc
jar，它们可能具有重复的类。

请指教