java.lang.NoClassDefFoundError：javax / servlet / jsp / jstl / core / Config我正在使用Javascript和JSF為網站開發FB登錄應用程序。我在這里發布了我的代碼。問題是，當我運行我的應用程序時，它不會顯示JSF頁面，而是拋出以下異常：Nov 28, 2013 7:21:46 PM org.apache.catalina.core.StandardWrapperValve invoke SEVERE: Servlet.service() for servlet [Faces Servlet] in context with path [/FacebookLogin] threw exception [javax/servlet/jsp/jstl/core/Config] with root cause java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/Config     at com.sun.faces.application.view.JspViewHandlingStrategy.executePageToBuildView(JspViewHandlingStrategy.java:344)     at com.sun.faces.application.view.JspViewHandlingStrategy.buildView(JspViewHandlingStrategy.java:153)     at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:99)     at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)     at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)     at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)     at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)     at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)這里有什么問題，我該如何解決？