I have the following scenarios for which i need to write hibernate mapping file.


My POJO has the folllowing structure,

public class Test {

public Test() {
}

private Map<String, Set<String>> variable1;

public void setVariable1(final Map<String, Set<String>> theVariable1) {
variable1 = theVariable1;
}


public Map<String, Set<String>> getVariable1() {
return variable1;
}

private Map<String, Map<String>> variable2;

public void setVariable2(final Map<String, Map<String>> theVariable2) {
variable1 = theVariable2;
}


public Map<String, Set<String>> getVariable2() {
return variable2;
}

}

This object structure is a valid one, as i can implement this object model with out using hibernate. "If something i can do with out using hibernate, i should be able to do that using hibernate too".

I hope everybody accept this statment. Now the problem is i dont know the answer to the following question,

How do i write the hibernate mapping for both these variables, variable1 and variable2 in the Test.hbm.xml file?

Please help me out ASAP.

Thanks,
Amjath Sharief

This is not possible. Nested Collections are not supported.

Dear Hibernate users,

Is there any other work around in hibernate to resolve my object model mapping? Please help me out and provide me some ideas on that.


Thanks,
Amjath Sharief

Actually it can be done (but nontrivial) using a UserCollectionType in HB3.

To resolve this, normally I create a class for the value of the mapped map collection. This new class contains the set.

Hi,

Can you explain how to do the mapping for the wrapper class which has Set or Map?

An example would be very nice.

I have been struggling with this requirements for years now. Still hibernate has no support for this??

Thanks,
Amjath