Buddy's,

I want to create one Criteria class based on another that have just his filters. But I want a new class, not a reference to the original class. Basically I new instance, a clone,

Does anybody know how do I do it?

Hi,

Cloning comes in JAVA....

Anyway..Use the Cloneable interface to have the clone of the other object. To have a deep clone write it into a file and then read it again.
or Use BeanUtils class to do the cloning.

You can search the Cloneable interface in google for examples.

Hope this helps.

Unfortunately the beanutils can't clone the Criteria object. And To create a new Criteria that implements Cloneable is difficult, cause we're talking about a framework class and where we access acrossing an interface.

Anyway thank you.

Hi,

Did u try the deep clone????

i.e)
try {
Criteria criteria = session.createCriteria(CategoryInfo.class);
ByteArrayOutputStream b = new ByteArrayOutputStream();
ObjectOutputStream out = new ObjectOutputStream(b);
out.writeObject(criteria);
ByteArrayInputStream bIn = new ByteArrayInputStream(b.toByteArray());
ObjectInputStream oi = new java.io.ObjectInputStream(bIn);
Criteria clonedCriteria = (Criteria) oi.readObject();
}catch (Exception e) {
e.printStackTrace();
}

Hope this helps:-)

Oh, Sorry. I forgot trying this.

I tryied rigth now. But there is a trouble. When I call the "list()" method, it throws a NullPointerException. I had a look at the source code of hibernate and I've see that the error is that it looses the reference to the session.

I solved doing this:

( (CriteriaImpl) clonedCriteria).setSession( (SessionImpl)getSession() );

I had to expose the implementation, because the setSession existis only on the CriteriaImpl and signature of the method get SessionImpl.

Is there another way? Or necessarily I need to expose the implementation?

Is there some trouble exposing the implementation?

Really thank you anyway. You're just helping me very much

I don't know any other way:( May be others can help:-)