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problem with EnhancedUserType as inner class

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dlipofsky

Post subject: problem with EnhancedUserType as inner class

Posted: Sat Nov 08, 2008 4:08 pm

Newbie

Joined: Wed Oct 31, 2007 9:16 pm
Posts: 9

I am trying to map a Java 5 enum to an int column in the database.
I'm using

Code:

  <property name="kind" type="com.mycompany.FooBar.KindUserType">
      <meta attribute="property-type">com.mycompany.FooBar.Kind</meta>
  </property>

Code:

public class FooBar {
  ...
  public static enum Kind { ... }
  public static class KindUserType implements EnhancedUserType { ... }
}

and I get this error:

Code:

org.hibernate.MappingException: Could not determine type for: com.mycompany.FooBar.KindUserType, for columns: [org.hibernate.mapping.Column(kind)]
        at org.hibernate.mapping.SimpleValue.getType(SimpleValue.java:266)
        at org.hibernate.mapping.SimpleValue.isValid(SimpleValue.java:253)
        at org.hibernate.mapping.Property.isValid(Property.java:185)
        at org.hibernate.mapping.PersistentClass.validate(PersistentClass.java:440)
        at org.hibernate.mapping.RootClass.validate(RootClass.java:192)
        at org.hibernate.cfg.Configuration.validate(Configuration.java:1102)
        at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1287)
...

However, if I move KindUserType so that it is a stand alone class (not
an inner class) it works fine. It works fine with the enum as an
inner class, so it doesn't seem like it could be a classpath problem.

So is this just a hibernate bug or is there something I am missing?
hibernate-3.2.6.ga, jboss-4.2.3.GA, jdk1.5.0_15_64bit

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thatmikewilliams

Post subject:

Posted: Sun Nov 09, 2008 7:48 am

Expert

Joined: Fri Jul 13, 2007 8:18 am
Posts: 370
Location: london

Shouldn't you refer to the inner class using $ not .

com.mycompany.FooBar$KindUserType

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dlipofsky

Post subject:

Posted: Mon Nov 10, 2008 1:48 pm

Newbie

Joined: Wed Oct 31, 2007 9:16 pm
Posts: 9

I just tried it and "$" actually works - which is strange, and I still
think it is a bug. Java uses "$" for the class file on the filesystem,
but uses "." everywhere else. For example you use "." in import
statements when importing inner classes. And in my example I
use "." for the property-type class, which is also an inner class.
So to get it to work I need to use:

Code:

<property name="kind" type="com.mycompany.FooBar$KindUserType">
    <meta attribute="property-type">com.mycompany.FooBar.Kind</meta>
</property> 

both these classes are inner classes, but you have to use "$" in
one place and "." in the other. That just seems wrong.

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thatmikewilliams

Post subject:

Posted: Mon Nov 10, 2008 3:21 pm

Expert

Joined: Fri Jul 13, 2007 8:18 am
Posts: 370
Location: london

I agree it seems a bit awkward but it does makes sense. The type name has to be instantiated by hibernate using ClassLoader.loadClass(name)/Class.forName(name). For these methods the "binary name" is required i.e. with the $. My understanding of the meta tags is they are used by tools to generate code - not instantiated directly. In this case you probably want the canonical name (with the dot) otherwise you'll end with an import statement containing a $.

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