[hibernate-issues] [Hibernate-JIRA] Created: (HHH-2754) Inner classes in methods cannot be used in select clause when with conjunction with "typesafe Java object" mechanism

[Adam Wozniak (JIRA)]

Inner classes in methods cannot be used in select clause when with conjunction with "typesafe Java object" mechanism
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                 Key: HHH-2754
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2754
             Project: Hibernate3
          Issue Type: New Feature
    Affects Versions: 3.2.4.sp1
            Reporter: Adam Wozniak


Hello

Here in the documentation to Hibernate Core:
http://www.hibernate.org/hib_docs/v3/reference/en/html_single/#queryhql-select

... we have a following example:
select new Family(mother, mate, offspr)
from DomesticCat as mother
    join mother.mate as mate
    left join mother.kittens as offspr

But this mechanism doesn't work when Family class is defined as inner class in a method.

So when I wrote something like this:

void myBusinessMethod()
{
		class Family3
		{
			private  String rowid;
			private  long   coId;
			private  int    csSeqno;

			public Family3()
			{
				//
			}

			@SuppressWarnings("unused")
			public Family3(
				  final String rowid
				, final long   coId
				, final int    csSeqno
				)
			{
				//System.out.println("ssss");
				this.rowid   = rowid;
				this.coId    = coId;
				this.csSeqno = csSeqno;
			}
		}

... and within this method I'm trying to do this:
query = sess.createQuery(
"select new typesafe_Java_object.TypesafeJavaObjectEMRWTest$1Family3(t.id, t.coId, t.csSeqno) from BSCSCgTaroptLog t");
				
list = query.list();

... then I'm slapped by a following exception:
org.hibernate.hql.ast.QuerySyntaxException: Unable to locate appropriate constructor on class [typesafe_Java_object.TypesafeJavaObjectEMRWTest$1Family3] [select new typesafe_Java_object.TypesafeJavaObjectEMRWTest$1Family3(t.id, t.coId, t.csSeqno) from pl.capgemini.tme.bonobo.model.BSCSCgTaroptLog t]
	at org.hibernate.hql.ast.QuerySyntaxException.convert(QuerySyntaxException.java:31)
	at org.hibernate.hql.ast.QuerySyntaxException.convert(QuerySyntaxException.java:24)
(...)

So the question is:
Is it possible to add another method to org.hibernate.Session:
public Query createQuery(String queryString, FactoryType factoryToGenerateMyInnerEntities)
???

Why do I need such mechanism? I rewriting a legacy system (Oracle PL/SQL) and I have many different HQL queries. To use "typesafe Java object" I must make my mediate classes static. But then I would have a kind of class bloat. And this is the reason why I would like to hide those classes and make them much more locally (for example inside my one single java method).

Kind regards,
Adam Wozniak


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