Getting issue to merge two objects in hibernate using Session.merge() function

Question

I am trying to update single record in database using hibernate, so I want to merge updated object. I am having code to update object and return merged hibernate entity object like,

  protected <T> T updateObject(T o) {
        Session s = getSession();
        @SuppressWarnings("unchecked")
        T mergedObject = (T) s.merge(o);
        s.update(mergedObject);
        return mergedObject;
    }

When I am trying to update Multivalued attribute (e.g. List of addresses), If I add new address in list and call update fuction,

After T mergedObject = (T) s.merge(o); , mergedObject containing null value and transaction becomes failed. How can I do it properly?

Nimesh · Accepted Answer · 2015-04-15 06:35:38Z

0

If your object is list then you need to iterate over list and merge particular entity separately. Though you cannot use only String. The object must be a hibernate entity. With hibernate entity you can do like this.

    T mergedObject = null;
    if(o instanceof List){
        for(Object obj: o){
              mergedObject = (T) s.merge(obj);
        }
    }else{
        mergedObject = (T) s.merge(o);
    }

edited Apr 15, 2015 at 6:35

answered Apr 14, 2015 at 13:16

Nimesh

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5 Comments

Mayuri Hiwale Over a year ago

My object contains List as well as String. It is in the form like,public class User{ private long id; private String userName; private List<String> schemas; private Name name; private Boolean active; private String password; private List<Ims> ims; private List<Address> addresses; private List<Email> emails; }

Nimesh Over a year ago

May be you are looking for this stackoverflow.com/questions/5867130/hibernate-liststring

Mayuri Hiwale Over a year ago

What will I do when object is of type User (java class)?

Nimesh Over a year ago

Have you done mapping of OneToMany for other list that you mentioned like Address, Email.

Mayuri Hiwale Over a year ago

Yes. I've done mapping like, @OneToMany(mappedBy = "user", orphanRemoval = true) private List<Email> emails;

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