读取CLOB字段的问题，同样的代码原来可以现在不可以，郁闷！！

[iStringTheory]

//然后读取CLOB字段的信息
String clobText = "";
sql = "SELECT NEWS_CONTENT FROM TBL_IPP_NEWS WHERE NEWS_ID=?";
ps = con.prepareStatement(sql);
ps.setString(1, (String) pPrimaryKey);
rs = ps.executeQuery();
if (rs.next()) {
/********下面这行类型转换代码报错****************/
oracle.jdbc.driver.OracleResultSet oRs = (oracle.jdbc.driver.
OracleResultSet) rs;
oracle.sql.CLOB clob = (oracle.sql.CLOB) oRs.getClob("NEWS_CONTENT");
/*************************************************/
//CLOB clob = ((OracleResultSet)rs).getCLOB (1);
if (! (null == clob || clob.length() == 0)) {
clobText = clob.getSubString( (long) 1, (int) clob.length());
pNewsVO.setContent1(clobText);
}
}

错误信息：
java.lang.ClassCastException
at strong.egp.ipp.dataaccess.NewsDAO.findByPrimayKey(NewsDAO.java:74)
at strong.egp.ipp.action.NewsAction.execute(NewsAction.java:74)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1053)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:387)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:305)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6310)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:317)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3622)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2569)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)


请各位帮忙看看！谢了！