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Array of type Enum

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Post subject: Array of type Enum

Posted: Mon Jul 07, 2008 12:34 pm

Newbie

Joined: Mon Jul 07, 2008 9:47 am
Posts: 2

Hello,

I have an Enum type "Month"

public enum Month {
January, February, March, April, May, June, July, August, September, October, November, December;
};

In my class I have a variable that is an array of these enum types.

Month[] months;

On trying to persist this class, it errors out.

Caused by: java.lang.ClassCastException: [Lcom.company.poll.gwt.client.Recurrence$Month; cannot be cast to java.lang.Enum
at org.hibernate.type.EnumType.nullSafeSet(EnumType.java:117)

Looking at the source where this is occurring the code is.

int ordinal = ( (Enum) value ).ordinal();

This is converting they array of Enum types to the Enum object itself. Any ideas if this is in fact a bug or is there an Enum array limitation that I have not been able to find? I tried both the development and production releases and it doesn't make a difference.

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hardy.ferentschik

Post subject:

Posted: Wed Jul 09, 2008 5:15 am

Hibernate Team

Joined: Thu Apr 05, 2007 5:52 am
Posts: 1689
Location: Sweden

Hi,

how have you annotated/configured your months property? I believe a simple OneToMany won't work, but this could:

Code:

   @CollectionOfElements
   @IndexColumn(name = "pos", base=1)
        private Month[] months;

--Hardy

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sbader

Post subject:

Posted: Thu Jul 10, 2008 10:07 am

Newbie

Joined: Thu Aug 02, 2007 9:15 am
Posts: 2

I met the same ClassCastException recently, and I too think this is likely a but. Different usage scenario. In my case, at least, proper configuration of property mapping is not an issue.

I'm trying to pass Array of enum as a parameter to an HQL query.

Stacktrace:

Code:

Caused by: java.lang.ClassCastException: [Lweblock.model.ValidationStatus;
   at org.hibernate.type.EnumType.nullSafeSet(EnumType.java:125)
   at org.hibernate.type.CustomType.nullSafeSet(CustomType.java:156)
   at org.hibernate.param.NamedParameterSpecification.bind(NamedParameterSpecification.java:38)
   at org.hibernate.loader.hql.QueryLoader.bindParameterValues(QueryLoader.java:491)
   at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1563)
   at org.hibernate.loader.Loader.doQuery(Loader.java:673)

Here's the set up:
HQL where clause: (obligor.validationStatus in (:validationStatus))
SQL translation: where obligor0_.VALIDATION_STATUS in (?)

Code:

ValidationList[] list;
...
Query obligorQuery = entityManager.createQuery(hql);
obligorQuery.setParameter("validationStatus", list);
...
List<Obligor> obligors = obligorQuery.getResultList(); // Exception here

Enum definition:

Code:

public enum ValidationStatus {
   CONVERTED("Converted"),PENDING("Pending"), VALID("Valid"), INVALID("Invalid");

   private ValidationStatus(String displayValue) {
      this.displayValue = displayValue;
   }

   private String displayValue;

   public String getDisplayValue() {
      return displayValue;
   }
   public void setDisplayValue(String displayValue) {
      this.displayValue = displayValue;
   }

Property Mapping:

Code:

    @Enumerated (EnumType.STRING)
    @Column(name="VALIDATION_STATUS",length=10)
    public ValidationStatus getValidationStatus() {
        return validationStatus;
    }

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hardy.ferentschik

Post subject:

Posted: Fri Jul 11, 2008 5:15 am

Hibernate Team

Joined: Thu Apr 05, 2007 5:52 am
Posts: 1689
Location: Sweden

Hi,

maybe you could create a Jira issue and attach a test case. This would ensure the quickest resolution to the problem.

--Hardy

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backslash

Post subject:

Posted: Fri Jul 11, 2008 3:25 pm

Newbie

Joined: Mon Jul 07, 2008 9:47 am
Posts: 2

I apologize, I was occupied before I could get back to test this.

hardy.ferentschik was right that adding those annotations to an array of Enums made it work properly.

Thanks!

Still it seems a bit odd that a ClassCastException would be thrown. Seems like a simple check.

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