пытаюсь использовать ConnectionPool.
скажите плз, из-за чего пишется вот это...

Exception report

message

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

exception

javax.servlet.ServletException: Cannot create resource instance
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:862)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:795)
org.apache.jsp.jsp._1_jsp._jspService(_1_jsp.java:81)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)

root cause

javax.naming.NamingException: Cannot create resource instance
org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:179)
javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:301)
org.apache.naming.NamingContext.lookup(NamingContext.java:837)
org.apache.naming.NamingContext.lookup(NamingContext.java:197)
org.apache.jsp.jsp._1_jsp._jspService(_1_jsp.java:61)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)


note The full stack trace of the root cause is available in the Tomcat logs.

в server.xml

<GlobalNamingResources>

<!-- Test entry for demonstration purposes -->
<Environment name="simpleValue" type="java.lang.Integer" value="30"/>

<!-- Editable user database that can also be used by
UserDatabaseRealm to authenticate users -->
<Resource name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved">
</Resource>
<ResourceParams name="UserDatabase">
<parameter>
<name>factory</name>
<value>org.apache.catalina.users.MemoryUserDatabaseFactory</value>
</parameter>
<parameter>
<name>pathname</name>
<value>conf/tomcat-users.xml</value>
</parameter>
</ResourceParams>
<Resource name="JDBC_CNX" auth="Container"
type="oracle.jdbc.pool.OracleConnectionPoolDataSource"/>

<ResourceParams name="JDBC_CNX">
<parameter>
<name>factory</name>
<value>oracle.jdbc.pool.OracleDataSourceFactory</value>
</parameter>
<parameter>
<name>driverClassName</name>
<value>oracle.jdbc.driver.OracleDriver</value>
</parameter>
<parameter>
<name>url</name>
<value>jdbc:oracle:thin:@10.10.10.10:1521:ttt</value>
</parameter>
<parameter>
<name>username</name>
<value>wefff</value>
</parameter>
<parameter>
<name>password</name>
<value>123</value>
</parameter>
<parameter>
<name>maxActive</name>
<value>20</value>
</parameter>
<parameter>
<name>maxIdle</name>
<value>10</value>
</parameter>
<parameter>
<name>maxWait</name>
<value>-1</value>
</parameter>
</ResourceParams>

</GlobalNamingResources>

такую же штуку внутри <GlobalNamingResources></GlobalNamingResources>
описал в

<Context path="" docBase="project" debug="0" reloadable="true">
- = - = -
</Context>
в файле CATALINA_HOME/conf/Catalina/localhost/project.xml

в CATALINA_HOME/webapps/project/WEB-INF/web.xml
внутри
<web-app>
<resource-ref>
<description>Oracle Datasource example</description>
<res-ref-name>JDBC_CNX</res-ref-name>
<res-type>oracle.jdbc.pool.OracleConnectionPoolDataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
</web-app>

в коде:
Context initContext = new InitialContext();
Context envContext = (Context)initContext.lookup("java:/comp/env");
DataSource ds = (DataSource)envContext.lookup("JDBC_CNX");
Connection conn = ds.getConnection();

помогите плз.
до сих пор ничего не получилось (((