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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

Solutions on the web

via Oracle Community by dlclarke, 1 year ago
This exception has no message.
via GitHub by scgray
, 1 year ago
java.lang.NullPointerException: 	at java.util.Hashtable.put(	at org.apache.jasper.runtime.PageContextImpl.setAttribute(	at net.sf.navigator.taglib.UseMenuDisplayerTag.doStartTag(	at org.apache.jsp.coolmenu4_jsp._jspx_meth_menu_useMenuDisplayer_0(	at org.apache.jsp.coolmenu4_jsp._jspService(