java - Not able to resolve the type of a lambda parameter -


so trying implement custom collector unfortunatelly stuck @ pretty interesting problem: 

@override public biconsumer<map<localdate, list<tripresultdto>>, tripresultdto> accumulator() {     return (acc,elem) -> {         long departuretime = elem.getoutbound().getdeparturetimelocal();         localdate departuredate = new localdatetime(departuretime).tolocaldate();         list<tripresultdto> othersinthesameday = acc.getordefault(departuredate,new linkedlist<>());         othersinthesameday.add(elem);         acc.put(departuredate,othersinthesameday);     }; }

so in code above, compiler cannot resolve of methods of elem object of type tripresultdto.

needless getoutbound method highlighted in red , cannot resolved. quite strange looking @ intelli sense tripresultsdto seems treated instance of object rather tripresultdto. have idea why might happening.

also idea doing doing in better way welcome.

so pretty noob mistake. had done in signature of collector was: 

public class cheapestperdaycollector <tripresultdto> implements collector<tripresultdto, map<localdate, list<tripresultdto>>, list<tripresultdto>> {

which signified tripresultsdto generic type rather actual class. rewrote : 

public class cheapestperdaycollector  implements collector<tripresultdto, map<localdate, list<tripresultdto>>, list<tripresultdto>> {

and works fine.


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