The following has evaluated to null or missing: ==> dataId [in template "bookDetail.ftl" at line 26, column 43] ---- Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)?? ---- ---- FTL stack trace ("~" means nesting-related): - Failed at: @periodical_detail id="${dataId}"; list [in template "bookDetail.ftl" at line 26, column 17] ----