IntelliJ Java 8

Question

This line compiles

List<Trade> trades = otrades.stream()
                     .sorted(Comparator.comparing(t -> t.getMeta().getTradeDate()))
                     .collect(Collectors.toList()));

But adding a 'thenComparing' does not

List<Trade>trades = otrades.stream()
                   .sorted(Comparator.comparing(t -> t.getMeta().getTradeDate())
                   .thenComparing(t -> t.getName()))
                   .collect(Collectors.toList()));

Compiler error is that it can not resolve getMeta().

(As there don't appear to be any errors in the code I'm assuming the problem is in IntelliJ).

Thanks

Answer 1

For a reason I don't understand, type inference fails in the second case. But you can give the type of t

List<Trade>trades = otrades.stream()//*******
   .sorted(Comparator.comparing(     (Trade t) -> t.getMeta().getTradeDate())
   .thenComparing(t -> t.getName()))
   .collect(Collectors.toList()));

In your example, the compiler finds that t is something else that a Trade (probably Object). That's why the method getMeta() cannot be found.