Java.lang.NullPointerExceptioncom.wgh.tools.ConnDB.exe cuteQuery (ConnDB. java: 56) com. wgh. dao. diaryDao. queryDiary (DiaryDao. java: 28) com. wgh. servlet. diaryServlet. listAllDiary (DiaryServlet. java: 249) com. wgh. servlet. diaryServlet. doPost (DiaryServlet. ja... mysqljavaweb exception database
Java. lang. NullPointerException
Com.wgh.tools.ConnDB.exe cuteQuery (ConnDB. java: 56)
Com. wgh. dao. DiaryDao. queryDiary (DiaryDao. java: 28)
Com. wgh. servlet. DiaryServlet. listAllDiary (DiaryServlet. java: 249)
Com. wgh. servlet. DiaryServlet. doPost (DiaryServlet. java: 52)
Com. wgh. servlet. DiaryServlet. doGet (DiaryServlet. java: 66)
Javax. servlet. http. HttpServlet. service (HttpServlet. java: 624)
Javax. servlet. http. HttpServlet. service (HttpServlet. java: 731)
Org. apache. tomcat. websocket. server. WsFilter. doFilter (WsFilter. java: 52)
Com. wgh. filter. CharacterEncodingFilter. doFilter (CharacterEncodingFilter. java: 24)
Null pointing exception. is this related to the database? Thank you for your answers.