Java facesContext.getResponseWriter.write()处的NullPointerException
我正在使用Java facesContext.getResponseWriter.write()处的NullPointerException,java,jsp,Java,Jsp,我正在使用facesContext.getResponseWriter.write()显示错误消息,但getResponseWriter的值为null。如何解决这个问题 if(context != null){ context.getResponseWriter().write(msg) ; } else{ pageContext.getResponse().getWriter().write( "<div id='errorMsgsFromTag' style
facesContext.getResponseWriter.write()
显示错误消息,但getResponseWriter
的值为null
。如何解决这个问题
if(context != null){
context.getResponseWriter().write(msg) ;
}
else{
pageContext.getResponse().getWriter().write(
"<div id='errorMsgsFromTag' style='position:absolute;visibility:hidden'>" + msg + "</div>");
}
FacesContext context = FacesContext.getCurrentInstance();