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Hibernate seq genration issue

Posted on 2009-07-12
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Last Modified: 2012-05-07
I am trying to instantiate an entity that is mapped to database through hibernate. Id of this entity is generated through seq.

I have instantiated this entity inside thread and trying to save it. Each time seq
in multithreded environemnt, it creates same id.

It seems that hibernate sequence generator is not thread safe. Can anyone help me out in finding a way to make it thread safe in my multithreaded java app.
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Question by:rajeevy69
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7 Comments
 
LVL 23

Assisted Solution

by:Ajay-Singh
Ajay-Singh earned 1000 total points
ID: 24833943
Can you post the mapping file?
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Author Comment

by:rajeevy69
ID: 24838996
Hii,
mapping file looks like this:

<hibernate-mapping>
       
    <class name="Employer" table="employers">
        <id name="id">
            <generator class="sequence">
                <param name="sequence">employer_id_seq</param>
            </generator>
        </id>
        <property name="name"/>
     <property name="country"/>

    </class>
</hibernate-mapping>
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LVL 23

Assisted Solution

by:Ajay-Singh
Ajay-Singh earned 1000 total points
ID: 24840542
Your mapping looks OK, but the behavior is weired. Are you
getting the same sequence all the time?
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Author Comment

by:rajeevy69
ID: 24840606
not always.

when accessing from different thread,this problem is happening. bu if i try from another instance it works fine.
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LVL 23

Assisted Solution

by:Ajay-Singh
Ajay-Singh earned 1000 total points
ID: 24840813
Are you sharing the session across threads?
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Accepted Solution

by:
rajeevy69 earned 0 total points
ID: 24841273
yes.
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Author Comment

by:rajeevy69
ID: 25502517
NA
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