Kotlin / IntelliJ - Compiler cannot find correct parameter type of function

Question

I'm writing a code in Kotlin language (of JetBrains) using IntelliJ and i'm facing a error on compiler where the compiler cannot find the correct parameter type of a function, always saying that the function receve a Nothing parameter.

Someone have any idea of what is the problem?

Print Screen showing the error on IntelliJ IDE

In the image, the console show the compiler error, but a help on center of the screen shows that IntelliJ can find the correct parameter type of the function, but compiler not.

==== Edited ==========================================

The Java code is:

  @Transactional
  public int deletar(BuscaInfo info) {

    // ----  Criando a busca ao banco:
    CriteriaBuilder cb = em.getCriteriaBuilder();
    CriteriaDelete query = cb.createCriteriaDelete( info.classe );
    Root root = query.from( info.classe );

    // Cláusula WHERE do banco:
    Predicate[] preds = WhereBuilder.build(cb, root, info.where);
    if (preds.length < 1) {
      throw new MsgException(JsonResponse.ERROR_EXCECAO,null,"Os parâmetros de filtragem da QueryString não são válidos.");
    }
    query.where(preds);


    // A busca ao banco:
    int qtd = em.createQuery(query).executeUpdate();
    return qtd;
  }

and info.classe is of type Class<?>.

Using Hibernate 5.x and JPA 2.1 api to compile.
That code works on WildFly 9.x and 10.x.

Denis Zharkov · Accepted Answer · 2017-03-10 13:12:16Z

2

Can you please check the type of q variable? (navigate to it, the run alt+q) I suppose its type is CriteriaDelete<*>, and none of these from methods can be called for the same reasons they can't in Java on a variable of type CriteriaDelete<?>: we can't say exactly what T was there when the instance was created.

But diagnostic, of course, could be better here. I've created issue on this

answered Mar 10, 2017 at 13:12

Denis Zharkov

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4 Comments

RCC Over a year ago

Thanks for reply. Yes, the q variable is CriteriaDelete, but this code is a rewrite of a Java code i have, and in Java i call this .from( Class<?> ) method of CriteriaDelete and CriteriaUpdate (not post about, but i have same issue with CriteriaUpdate). If i not call this method, an exeception is thrown saying that root need to be specified. Thanks to open an issue =D

Denis Zharkov Over a year ago

It's very strange, that it works in Java. Can you please share the relevant Java version?

RCC Over a year ago

Edited the question adding the piece of code write on Java.Thanks for your help.

Denis Zharkov Over a year ago

There is a tricky moment in your Java code: you use raw type CriteriaDelete query that effectively turns off exact type matching when calling from on it. If you use CriteriaDelete<?> type instead you will get a similar error. In Kotlin there are no raw types, but you always can use unsafe cast like (q as CriteriaDelete<Any>).from(info.classe as Class<Any>) that would be a fair Kotlin version of your Java code

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