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Editorial Team
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Asked: 2026-06-17T18:20:45+00:00

I am using EclipseLink for a small project to record user activities. I have

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I am using EclipseLink for a small project to record user activities. I have a class that captures details about the activity and I am using the table generator strategy to generate the primary key ids for that class.

The issue I am facing is that EclipseLink (I will call it EL) is assigning primary keys at an increment of 50 which I understand is the default value for the allocationSize. This is within the same JVM cycle (i.e., no reboot).

I understood that the allocationSize is used for the number of IDs EL would pre-allocate in memory. I would like to use this functionality, but EL doesn’t seem to be working like that.

Only when I change the allocationSize to 1 do I get EL to generate Primary Keys sequentially.

Any help would be greatly appreciated…

I am using EclipseLink 2.3.0.

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1 Answer

  1. Editorial Team

    Thanks everyone for your help.

    I have solved my problem. I was manually managing the lifecycle of the EntityManager and the transactions as well. I changed my code to have the EntityManager injected into my EJB and let the container take care of the transactions. I have set the allocationSize to 1000 and getting the desired results. Once again, thanks vels4j, Chris, and James for your help

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