俺搜索了好多，好象都没有配置成功！请教大虾 问题在何出？?

我用的是jbx.集成的tomcat是jakarta-tomcat-4.0.6-LE-jdk14.
现在我用tomcat自带的数据源配置了一个连接orcale的数据源,可是出现问题了,这个配置问题我基本上都是按网上说的配置的..可仍然不成功,有望大虾指教!

我的server.xml配置如下:
<!-- Tomcat Root Context -->
<!---->
<Context path="" docBase="ROOT" debug="0" />
<Resource name="jdbc/myDS" auth="Container"
type="javax.sql.DataSource"/>

<ResourceParams name="jdbc/myDS">
<parameter>
<name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
</parameter>

<parameter>
<name>user</name>
<value>mhuangtest</value>
</parameter>

<parameter>
<name>password</name>
<value>mhuangtest</value>
</parameter>

<parameter>
<name>driverClassName</name>
<value>oracle.jdbc.driver.OracleDriver</value>
</parameter>

<parameter>
<name>driverName</name>><!--url-->
<value>jdbc:oracle:thin:@192.168.20.145:1521:temp</value>
</parameter>

<parameter>
<name>maxActive</name>
<value>20</value>
</parameter>

<parameter>
<name>maxIdle</name>
<value>20</value>
</parameter>

</ResourceParams>

</Context>

我的web.xml配置如下:
<resource-ref>
<res-ref-name>jdbc/myDS</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
<res-sharing-scope>Shareable</res-sharing-scope>
</resource-ref>

我启动了tomcat,然后我的测试代码如下:
Context ctx = null;
DataSource source = null;
ctx = new InitialContext();
source = (DataSource) ctx.lookup("java:comp/env/jdbc/myDS");
Connection conn = source.getConnection();

报的异常如下:
TyrexDataSourceFactory: Cannot create DataSource, Exception
java.lang.NoClassDefFoundError: tyrex/jdbc/xa/EnabledDataSource
at org.apache.naming.factory.TyrexDataSourceFactory.getObjectInstance(TyrexDataSourceFactory.java:166)
at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:164)
at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:301)
at org.apache.naming.NamingContext.lookup(NamingContext.java:834)
at org.apache.naming.NamingContext.lookup(NamingContext.java:181)
at org.apache.naming.NamingContext.lookup(NamingContext.java:822)
at org.apache.naming.NamingContext.lookup(NamingContext.java:181)
at org.apache.naming.NamingContext.lookup(NamingContext.java:822)
at org.apache.naming.NamingContext.lookup(NamingContext.java:181)
at org.apache.naming.NamingContext.lookup(NamingContext.java:822)
at org.apache.naming.NamingContext.lookup(NamingContext.java:194)
at org.apache.naming.SelectorContext.lookup(SelectorContext.java:183)
at javax.naming.InitialContext.lookup(InitialContext.java:347)
at cn.com.netkiss.mhuang.test.ClassA.ByTomcatDataSource(ClassA.java:77)
at cn.com.netkiss.mhuang.test.ClassA.test(ClassA.java:142)
at myproject.ConfigServlet.init(ConfigServlet.java:22)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:918)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:810)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3279)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:3421)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1123)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:638)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1123)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:343)
at org.apache.catalina.core.StandardService.start(StandardService.java:388)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:506)
at org.apache.catalina.startup.Catalina.start(Catalina.java:781)javax.naming.NamingException: Exception creating DataSource: tyrex/jdbc/xa/EnabledDataSource
at org.apache.naming.factory.TyrexDataSourceFactory.getObjectInstance(TyrexDataSourceFactory.java:233)
at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:164)
at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:301)
at org.apache.naming.NamingContext.lookup(NamingContext.java:834)
at org.apache.naming.NamingContext.lookup(NamingContext.java:181)
at org.apache.naming.NamingContext.lookup(NamingContext.java:822)