hello everyone:
   when I use method isLast() in ResultSet ,system give me a error report:
"java.lang.AbstractMethodError
	at _jsp._test2__jsp._jspService(/test2.jsp:53)
	at com.caucho.jsp.JavaPage.service(JavaPage.java:87)
	at com.caucho.jsp.JavaPage.subservice(JavaPage.java:81)
	at com.caucho.jsp.Page.service(Page.java:407)
	at com.caucho.server.http.Invocation.service(Invocation.java:290)
	at com.caucho.server.http.CacheInvocation.service
(CacheInvocation.java:121)
	at com.caucho.server.http.HttpRequest.handleRequest
(HttpRequest.java:238)
com.caucho.server.http.HttpRequest.handleConnection(HttpRequest.java:157)
	at com.caucho.server.TcpConnection.run(TcpConnection.java:140)
	at java.lang.Thread.run(Thread.java:484)