java.util.NoSuchElementException: No value present Java 8 Lambda [duplicate]

Question

I got this. But my list is not empty and they have element with code "ADPL". Why this return me NoSuchElement ?

String retour = CodeExecutionChaine.A.getCode();
    if (!lstChaines.isEmpty()) {
      retour = lstChaines.stream()
                         .filter(t -> t.getNomChaine() == Chaines.ADPL.getCode())
                         .map(Chaine::getStatutChaine)
                         .findFirst()
                         .orElse(CodeExecutionChaine.A.getCode());

The enum Chaines

public enum Chaines {

  ADPL("ADPL"),
  ADIL("ADIL"),
  ADSL("ADSL");

  private String code = "";

  Chaines(String code) {
    this.code = code;
  }

  public String getCode() {
    return this.code;
  }

}

This is the same for CodeExecutionChaine

Answer 1

Change t -> t.getNomChaine() == Chaines.ADPL.getCode() to t -> t.equals(Chaines.ADPL.getCode()).

== checks for identity. Therefore, == will result into true only if two references point to the same object. On the other hand, equals checks for equality. Two references that don't point to the same object but have similar properties are still considered equal. You get a NoSuchElementException because you used == to filter your Stream which resulted in zero elements satisfying the condition.