Enum me returning null Pointer

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Enum me returning null Pointer

Asked 7 years, 11 months ago

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My Enum is returning Null Pointer when re-running this call:

  System.out.println(DefinicaoSCM.getDefinicaoSCMPorDisciplina(Disciplina.IMPLEMENTACAO));

Implementation:

public enum DefinicaoSCM
{
   DESCONHECIDO(null, "NA", "NA"),
   IMPLANTACAO(Disciplina.IMPLANTACAO, "ipl_", "/Implantacao"),
   IMPLEMENTACAO(Disciplina.IMPLEMENTACAO, "imp_", "/Implementacao", "/Documentacao", "/Implantacao"),
   INTERFACE_GRAFICA(Disciplina.INTERFACE_GRAFICA, "ifg_", "/Design"),
   PROJETO(Disciplina.PROJETO, "prj_", "/Projeto"),
   REQUISITO(Disciplina.REQUISITO, "req_", "/Requisitos"),
   TESTE(Disciplina.TESTE, "tst_", "/Teste");

   private static Map<Disciplina, DefinicaoSCM> definicaoSCMPorDisciplina;
   private Disciplina disciplina;



   public static DefinicaoSCM getDefinicaoSCMPorDisciplina(Disciplina disciplina)
   {
      return definicaoSCMPorDisciplina.get(disciplina);
   }

2

definicaoSCMPorDisciplina is not instantiated.

– Genos

2016/11/25 at 17:37
Can you post your entire code from this class? In particular I would like to know about the constructor and how the definicaoSCMPorDisciplina is instantiated and populated.

– Victor Stafusa

2016/11/25 at 17:52
Although I don’t have the complete code, I’ve had problems using a Map in an Enum before. I suggest trying with an Immutablemap from Guava. I’ll find what I did to solve and put the code in after.

– Marcus Martins

2016/11/27 at 02:59

1 answer

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by Marcus Martins • **737** points · Answer 1 · 2016-11-28T11:53:53+00:00

To use a Map in an Enum, I could only use the Immutablemap of Guava, in your example, would be as below:

private static final Map<Disciplina, DefinicaoSCM> definicaoSCMPorDisciplina = ImmutableMap.<Disciplina, DefinicaoSCM>builder()
                    .put(Disciplina.IMPLANTACAO, new DefinicaoSCM())
                    .put(Disciplina.INTERFACE_GRAFICA, new DefinicaoSCM())
                    .put(Disciplina.PROJETO, new DefinicaoSCM())
                    .put(Disciplina.REQUISITO, new DefinicaoSCM())
                    .put(Disciplina.TESTE, new DefinicaoSCM())
                    .build();

Access to the Map continues in the same way .get(key).