[show] java.lang.NoClassDefFoundError: oracle/jdbc/driver/OracleDriver

java.lang.NoClassDefFoundError: oracle/jdbc/driver/OracleDriver
	at alumnus.Db_sql.connect(Db_sql.java:64)
	at alumnus.Db_sql.<init>(Db_sql.java:44)
	at _jsp._index__jsp._jspService(index.jsp:120)
	at _jsp._index__jsp._jspService(_index__jsp.java:32)
	at com.caucho.jsp.JavaPage.service(JavaPage.java:64)
	at com.caucho.jsp.Page.pageservice(Page.java:548)
	at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:194)
	at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:131)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:289)
	at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:298)
	at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:116)
	at com.caucho.server.dispatch.ForwardFilterChain.doFilter(ForwardFilterChain.java:95)
	at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:156)
	at com.caucho.server.webapp.AccessLogFilterChain.doFilter(AccessLogFilterChain.java:95)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:289)
	at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:838)
	at com.caucho.network.listen.TcpSocketLink.dispatchRequest(TcpSocketLink.java:1349)
	at com.caucho.network.listen.TcpSocketLink.handleRequest(TcpSocketLink.java:1305)
	at com.caucho.network.listen.TcpSocketLink.handleRequestsImpl(TcpSocketLink.java:1289)
	at com.caucho.network.listen.TcpSocketLink.handleRequests(TcpSocketLink.java:1197)
	at com.caucho.network.listen.TcpSocketLink.handleAcceptTaskImpl(TcpSocketLink.java:993)
	at com.caucho.network.listen.ConnectionTask.runThread(ConnectionTask.java:117)
	at com.caucho.network.listen.ConnectionTask.run(ConnectionTask.java:93)
	at com.caucho.network.listen.SocketLinkThreadLauncher.handleTasks(SocketLinkThreadLauncher.java:169)
	at com.caucho.network.listen.TcpSocketAcceptThread.run(TcpSocketAcceptThread.java:61)
	at com.caucho.env.thread2.ResinThread2.runTasks(ResinThread2.java:173)
	at com.caucho.env.thread2.ResinThread2.run(ResinThread2.java:118)