Found an interesting feature of hibernate that I wanted to share. The problem is I wanted an instance of one of the subclass and not a proxy.
When you define a mapping for an object like say
<many-to-one name=“account” column=“ACCOUNT_ID” not-null=“false” cascade=“all”/>
And if Account Class itself can have subclasses
<class name=“asrs.core.account.model.Account” table=“ACCOUNTS” discriminator-value=“null”>
<subclass name=“asrs.core.account.model.PersonAccount” discriminator-value=“PERS”>
<subclass name=“asrs.core.account.model.EmployerAccount” discriminator-value=“ER”>
When you get an instance of MyClass from hibernate, the under lying account MAY BE an instance of Hibernate generated subclass of account in other words a proxy that delegates all method invocations to a different instance and the type will not be one of the concrete class (i.e PersonAccount or EmployerAccount) but of type Account.
This may not be necessarily a bad thing, but in my situation, I needed a concrete sub class of Account.
To overcome this problem the solution is when you define your mapping do the following
<many-to-one name=“account” column=“ACCOUNT_ID” not-null=“false” cascade=“all” outer-join=“true”/>
Setting outer-join to true, cause hibernate to fetch eagerly even if proxying is enabled (lazy =true)