关于Hibernate 使用Tomcat自带的连接池的时候出现问题

<property name="connection.datasource">jdbc/homeOracle</property>
我把上面这句改成下面的，这个严重错误不报了，但是还是不能运行，
<property name="connection.datasource">java:comp/env/jdbc/homeOracle</property>
页面报下面错误javax.servlet.ServletException
at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:536)
at org.apache.jsp.jionus_jsp._jspService(jionus_jsp.java:596)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:210)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)很多省了，请哪位大虾看看？
多谢了。