Custom collections

[Sheldon Young]

I have a case where I have a collection MySet that extends HashSet and I believe it's causing an IllegalArgumentException.  For example:

public class MySet extend HashSet {
}

public class Foo {
   private MySet collection
   public MySet getCollection()
   public void setCollection(MySet collection)
}

The above construct will cause an IllegalArgumentException in BeanPopulator.invokeMethodAsPrivileged.  It appears to be attempting to invoke the set method of Foo it is passing a HashSet as the argument instead of an instance of MySet.

Any ideas about how to resolve or work around this?

[Joe D. Velopar]

Hi Sheldon,

Can you show me the source code for MySet, so I can construct a test to reproduce the problem ?

Thanks!

[Joe D. Velopar]

I managed to reproduce the problem.  The failure is due to the following code in HibernateBeanT4ransformer#createToCollection:
...
    if (from instanceof Set)
        return new HashSet<Object>();
...

The code is trying to avoid those proxy instances usually associated with a Hibernate persistent object.

I am looking into ways of fixing this...

[Joe D. Velopar]

Hi Sheldon,

This problem should now be fixed in release 3.2.6.  Please let me know if this works for you.

[Sheldon Young]

Thank you very much for the rapid response Joe!  I'll give it a whirl.

[Sheldon Young]

The change works fine.  Thanks again.