Unmapped class exception when using proxy interfaces

bshaw · **Joined:** Mon Feb 23, 2004 5:11 pm **Posts:** 39

Hibernate version:
Hibernate 3.0.5
Mapping documents:

Code:

Code:

<class name="Bar" table="BAR">
   ...
   ...
   <many-to-one class="Foo" ......./>
   ...
   ...
</class>

Bar.java

Code:

private Foo foo;
public Foo getFoo() {
    return foo;
}

public void setFoo(Foo f) {
    foo = f;
}

When I try to use this, I get the following exception while initializing:

Caused by: org.hibernate.MappingException: An association from the table BAR refers to an unmapped class: Foo

What am i missing?

pksiv · **Posted:** Fri Aug 12, 2005 4:10 pm

bshaw wrote:

Hibernate version:
Hibernate 3.0.5
Mapping documents:

Code:

Code:

<class name="Bar" table="BAR">
   ...
   ...
   <many-to-one class="Foo" ......./>
   ...
   ...
</class>

Bar.java

Code:

private Foo foo;
public Foo getFoo() {
    return foo;
}

public void setFoo(Foo f) {
    foo = f;
}

When I try to use this, I get the following exception while initializing:

Caused by: org.hibernate.MappingException: An association from the table BAR refers to an unmapped class: Foo

What am i missing?

You don't have a mapped class named "Foo" Only one named "FooImpl" Hibernate will use Foo for proxying but that doesn't change the name of the class associated with Hibernate.

bshaw · **Joined:** Mon Feb 23, 2004 5:11 pm **Posts:** 39

I realize that I dont have the mapping file for the Foo. But I wasn't sure if I needed one. Foo is just a interface I am using for proxy. I dont remember reading anywhere in the docs that the proxy interfaces would have to be mapped as well.

I will give it a try anyways.....

pksiv · **Posted:** Fri Aug 12, 2005 4:33 pm

bshaw wrote:

I realize that I dont have the mapping file for the Foo. But I wasn't sure if I needed one. Foo is just a interface I am using for proxy. I dont remember reading anywhere in the docs that the proxy interfaces would have to be mapped as well.

I will give it a try anyways.....

I don't think you need to map it. Just refer to FooImpl and Hibernate will use Foo when creating the LazyInitialization Proxy.

bshaw · **Joined:** Mon Feb 23, 2004 5:11 pm **Posts:** 39

I am not sure what you mean exactly when you say "refer to FooImpl". But I already tried using FooImpl (instead of Foo) in Bar.java , but I get a classcastexception when Hibernate calls setFooImpl() since the object passed is of type HiberbateProxy. To avoid the class cast exception I have to use the proxy interface.

kgignatyev · **Posted:** Fri Aug 12, 2005 5:07 pm

http://www.hibernate.org/hib_docs/v3/re ... tion-class
says :

Quote:

It is perfectly acceptable for the named persistent class to be an interface. You would then declare implementing classes of that interface using the <subclass> element. You may persist any static inner class. You should specify the class name using the standard form ie. eg.Foo$Bar.

it means in this case
<class name="Foo" table="FOO" >.......
<subclass.....
</class>